14 Sep '07 Major News

Contents on 14 September '07

Minor-Object News -- seven items
Minor-Object Science -- four papers
IAU Minor Planet Center
- NEOCP Activity -- 15 listings: 6 new, 9 updated
- New MPECs -- eleven MPECs
- Observers -- 33 observing facilities
Impact Risk Monitoring -- four objects reported
Chronology

Resources:

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Minor-Object News on 14 September '07

"New Mexico Fireball," SpaceWeather.com 14 Sept. - Quote: "Based on data from the [Sandia Lab] video, the visual magnitude of the fireball was -14.6, about four times brighter than a full Moon!" {permalink}
- "The Super Bolide of September 13," Radio Fireball Observatory 14 Sept. - Quote: "This fireball turned 'night into day' [at 3:20am MDT] and lit up the house! Interestingly, by radio this super bolide did not produce a strong forward scatter reflection." - Note: See more about the operation of this radio observatory and new Sandia Sentinel all-sky camera installation south of Santa Fe. {permalink}
- "Sandia sky camera records fireball," KRQE-TV 13 Sept. - Quote: "[A] muffled boom [was] reported in Albuquerque. A witness in Placitas north of Albuquerque reported hearing a louder boom." {permalink}
"Dawn ELV status," NASA KSC 14 Sept. - Quote: "On Tuesday, the Dawn spacecraft arrived at Pad 17-B at 5:10 a.m. after an overnight rollout from the Astrotech payload processing facility. At 8:01 a.m., Dawn was officially declared secure atop the Delta II rocket. Technicians successfully conducted spacecraft state-of-health checks on Wednesday. The launch team completed the flight program verification on Thursday without issues. This integrated launch readiness electrical test ensures the Dawn spacecraft and Delta II rocket are working together in unison. Installation of the payload fairing around the spacecraft is scheduled for Sept. 19." {permalink}
- "The Prius of Space," NASA JPL 13 Sept. - Quote: "What we find when Dawn gets to Vesta and Ceres will re-write the history books on the beginning of our solar system. But how we get there is almost as remarkable, 1.8 billion miles to Vesta, months flying around it performing science adjusting our orbits as we go. Then we travel another billion miles to Ceres where we do it all over again. That is a lot to ask of a beam of blue light." {permalink}
"American Indian group protests sale of 10,000-year-old meteorite," AP at New York Daily News 14 Sept. - Quote: "According to [owner Daryl] Pitt, there are roughly 20 pieces of the Willamette in the hands of private collectors... The upcoming auction includes [a] Brenham meteorite ... and a chunk of a meteorite that killed a Venezuelan cow." {permalink}
"Hawaii's observatories and their heavenly views," CNet News 13 Sept. - Note: Eight photos of installations atop Mauna Kea plus eight astronomical images. {permalink}

Minor-Object Science on 14 September '07

"Angular Momemtum of Binary Asteroids: Implication for their possible origin" by Descamps, Pascal with Franck Marchis, abstract & PDF at arXiv.org 14 Sept. - Quote: "We describe in this work a thorough study of the physical and orbital characteristics of extensively observed main-belt and Trojan binaries, mainly taken from the LAOSA (Large Adaptive Optics Survey of Asteroids, Marchis et al., 2006c) database, along with a selection of bifurcated objects. Dimensionless quantities, such as the specific angular momentum and the primary spin rate, are computed and discussed for each system. They suggest that these asteroidal systems might be the outcome of rotational fission or mass shedding of a parent body presumably subjected to an external torque. One of the most striking features of separated binaries composed of a large primary (Rp > 100 km) with a much smaller secondary (Rs < 20 km) is that they all have total angular momentum of 0.27. This value is quite close to the Maclaurin-Jacobi bifurcation (0.308) of a spinning fluid body. Alternatively, contact binaries and tidally locked double asteroids, made of components of similar size, have an angular momentum larger than 0.48. They compare successfully with the fission equilibrium sequence of a rotating fluid mass. In conclusion, we find that total angular momentum is a useful proxy to assess internal structure of such systems." {permalink}
"Origin of the Ocean on the Earth: Early Evolution of Water D/H in a Hydrogen-rich Atmosphere" by Genda, Hidenori with Masahiro Ikoma, abstract & PDF at arXiv.org 14 Sept. - Quote: "The origin of the Earth's ocean has been discussed on the basis of deuterium/hydrogen ratios (D/H) of several sources of water in the solar system. The average D/H of carbonaceous chondrites (CC's) is known to be close to the current D/H of the Earth's ocean, while those of comets and the solar nebula are larger by about a factor of two and smaller by about a factor of seven, respectively, than that of the Earth's ocean. Thus, the main source of the Earth's ocean has been thought to be CC's or adequate mixing of comets and the solar nebula. However, those conclusions are correct only if D/H of water on the Earth has remained unchanged for the past 4.5 Gyr. In this paper, we investigate evolution of D/H in the ocean in the case that the early Earth had a hydrogen-rich atmosphere, the existence of which is predicted by recent theories of planet formation no matter whether the nebula remains or not. Then we show that D/H in the ocean increases by a factor of 2-9, which is caused by the mass fractionation during atmospheric hydrogen loss, followed by deuterium exchange between hydrogen gas and water vapor during ocean formation. This result suggests that the apparent similarity in D/H of water between CC's and the current Earth's ocean does not necessarily support the CC's origin of water and that the apparent discrepancy in D/H is not a good reason for excluding the nebular origin of water." {permalink}
"The use of genetic algorithm to model protoplanetary discs" by Hetem, Jr., A. with J. Gregorio-Hetem, abstract & PDF at arXiv.org 14 Sept. - Quote: "[In] the present work we adopt a reprocessing flared disc model that considers hydrostatic, radiative equilibrium... We developed a method to optimise the parameters estimation based on genetic algorithms (GA). This paper is dedicated to describe the implementation of the new code, which has been applied for Herbig stars from the Pico dos Dias Survey catalogue, in order to illustrate the quality of the fitting for a variety of [spectral energy distribution] shapes." {permalink}
"Self-regulated gravitational accretion in protostellar discs" by Vorobyov, E.I. with S. Basu, abstract & PDF at arXiv.org 14 Sept. - Quote: "We present a numerical model for the evolution of a protostellar disc that has formed self-consistently from the collapse of a molecular cloud core... Our global modelling of the protostellar disc reveals that there is typically a residual nonzero gravitational torque from these density perturbations, i.e. their effects do not exactly cancel out in each region. In particular, the net gravitational torque in the inner disc tends to be negative during first several million years of the evolution, while the outer disc has a net positive gravitational torque. Our global model of a self-consistently formed disc shows that it is also self-regulated in the late phase, so that it is near the Toomre stability limit." {permalink}

NEOCP Activity on 14 September '07

The MPC's NEO Confirmation Page has 15 listings: 6 new, 9 updated

When last checked at 1929 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six new and nine updated listings. Of these, thirteen were "one nighters." So far Major News has counted a total of 29 objects listed on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs on 14 September '07

Minor Planet Electronic Circulars

As of last check at 1929 UTC, there have been eleven MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-R72 time-stamped "06:07 UT" - Daily Orbit Update - see below
MPEC 2007-R73 time-stamped "17:42 UT" - 2007 RO17 - see below
MPEC 2007-R74 time-stamped "17:45 UT" - 2007 RP17 - see below
MPEC 2007-R75 time-stamped "17:48 UT" - 2007 RQ17 - see below
MPEC 2007-R76 time-stamped "17:53 UT" - 2007 RR17 - see below
MPEC 2007-R77 time-stamped "18:00 UT" - 2007 RS17 - see below
MPEC 2007-R78 time-stamped "18:02 UT" - 2007 RT17 - see below
MPEC 2007-R79 time-stamped "18:05 UT" - 2007 RU17 - see below
MPEC 2007-R80 time-stamped "18:09 UT" - 2007 RV17 - see below
MPEC 2007-R81 time-stamped "18:12 UT" - 2007 RW17 - see below
MPEC 2007-R82 time-stamped "18:52 UT" - 2005 XL80

MPEC 2007-R82 - "18:52 UT" - 2005 XL80

K05X80L 2005 XL80 (H=18.1 ~812m) from Astronomical Research Obs. (ARO) (Sept. 12.35-39p3 at V=22.9-23.1 & 14.39-42p2 at V=22.7-8)

MPEC 2007-R81 - "18:12 UT" - 2007 RW17

K07R17W 2007 RW17 (H=21.2 ~195m) was discovered at 1227 UT 13 Sept. by the Siding Spring Survey (SSS), which observed it at Sept. 13.52-54p3 and 14.44-46p3. The discovery was confirmed by CEAMIG-REA (Sept. 14.04-05p3), Grasslands Obs. (Sept. 14.22-23p3), McDonald Obs. (Sept. 14.23-24p3), and Mt. John Obs. (Sept. 14.54-55p3).

MPEC 2007-R80 - "18:09 UT" - 2007 RV17

K07R17V 2007 RV17 (H=19.0 ~537m) was discovered at 1011 UT 13 Sept. by the Mt. Lemmon Survey (MLS), which observed it at Sept. 13.42-44p4. The discovery was confirmed by the Catalina Sky Survey (CSS) (Sept. 12.39-49p10 & 14.40-46p8), Farra d'Isonzo Obs. (Sept. 13.99p2), Modra Obs. (Sept. 14.10-11p2), CEAMIG-REA (Sept. 14.22-23p3), Grasslands Obs. (Sept. 14.30p3), McDonald Obs. (Sept. 14.38-39p3), and Jim Young via Table Mtn. Obs. (Sept. 14.39-40p4).

MPEC 2007-R79 - "18:05 UT" - 2007 RU17

K07R17U 2007 RU17 (H=18.2 ~776m) was discovered at 0927 UT 13 Sept. by MLS, which observed it at Sept. 13.39-47p8. The discovery was confirmed by Great Shefford Obs. (Sept. 14.06-07p2), Remanzacco Obs. (Sept. 14.08-09p2), Grasslands Obs. (Sept. 14.29p3), and McDonald Obs. (Sept. 14.34-36p3).

MPEC 2007-R78 - "18:02 UT" - 2007 RT17

K07R17T 2007 RT17 (small asteroid, H=25.6 ~26m) was discovered at 0920 UT 13 Sept. by MLS, which observed it at Sept. 13.39-46p7 and 14.36p4 at V=22.4-8. The discovery was confirmed by the Spacewatch 1.8m telescope (Sept. 14.44-46p3 at V=22.3).

MPEC 2007-R77 - "18:00 UT" - 2007 RS17

K07R17S 2007 RS17 (small asteroid, H=23.1 ~81m) was discovered at 0920 UT 13 Sept. by MLS, which observed it at Sept. 13.39-45p8 and 14.25-26p4. The discovery was confirmed by Great Shefford Obs. (Sept. 13.99-00p3) and Spacewatch 1.8m (Sept. 14.30-31p3).

MPEC 2007-R76 - "17:53 UT" - 2007 RR17

K07R17R 2007 RR17 (small asteroid, Earth MOID=7.4 LD, H=23.7 ~62m) was discovered at 0804 UT 13 Sept. by LINEAR, which observed it at Sept. 13.34-38p4. The discovery was confirmed by Remanzacco Obs. (Sept. 14.11-13p4), Great Shefford Obs. (Sept. 14.17-18p3), CEAMIG-REA (Sept. 14.18p3), Grasslands Obs. (Sept. 14.25-26p3), Prairie Grass Obs. (Sept. 14.33p3), Young/Table Mtn. (Sept. 14.35-36p4), McDonald Obs. (Sept. 14.39-40p3), and Lulin Minor Bodies Tracking (LIMIT) (Sept. 14.58p3).

MPEC 2007-R75 - "17:48 UT" - 2007 RQ17

K07R17Q 2007 RQ17 (small asteroid, Earth MOID=8.6 LD, H=22.7 ~98m) was discovered at 0549 UT 13 Sept. by MLS, which observed it at Sept. 13.24-26p4 and 14.18-19p3. The discovery was confirmed by LINEAR (Sept. 13.17-21p3), Guidestar Obs. (Sept. 13.86-90p3), Alter Satzberg Obs. (Sept. 13.88-92p4), Farra d'Isonzo Obs. (Sept. 13.91-92p2), Remanzacco Obs. (Sept. 13.92-95p2), Great Shefford Obs. (Sept. 13.95-96p3), CEAMIG-REA (Sept. 14.07-08p3), ARO (Sept. 14.12-13p3), Grasslands Obs. (Sept. 14.23p3), McDonald Obs. (Sept. 14.24-25p3), and Prairie Grass Obs. (Sept. 14.25-27p5).

MPEC 2007-R74 - "17:45 UT" - 2007 RP17

K07R17P 2007 RP17 (small asteroid, H=24.3 ~47m) was discovered at 0510 UT 13 Sept. by MLS, which observed it at Sept. 13.22-29p8 and 14.17-19p4. The discovery was confirmed by Mt. John Obs. (Sept. 14.51p2).

MPEC 2007-R73 - "17:42 UT" - 2007 RO17

K07R17O 2007 RO17 (small asteroid, Earth MOID=10.0 LD, H=25.8 ~23m) was discovered at 0643 UT 12 Sept. by MLS, which observed it at Sept. 12.28-34p7, 13.30-32p4, and 14.17-19p4. The discovery was confirmed by Great Shefford Obs. (Sept. 12.96-98p2) and Spacewatch 1.8m (Sept. 13.22-24p3).

<< DOU on 14 Sept. '07 >> MPEC 2007-R72 - "06:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K07R12T 2007 RT12 (small asteroid, arc=1 day, H=23.8 ~59m) from ARO (Sept. 13.25-26p3)
K07R09V 2007 RV9 (arc=3 days, H=19.9 ~355m) from Spacewatch 1.8m (Sept. 13.21-22p3) and MLS (Sept. 13.24-26p4)
K07R09U 2007 RU9 (arc=3 days, H=20.8 ~234m) from LINEAR (Sept. 13.19-23p4), McCarthy Obs. (Sept. 13.20-24p3), and Spacewatch 1.8m (Sept. 13.27-28p3)
K07R09T 2007 RT9 (arc=3 days, H=18.4 ~708m) from Spacewatch 1.8m (Sept. 13.25-26p3)
Observations of recently (no longer) risk-listed objects
K07R09R 2007 RR9 (Q=4.752 AU, arc=3 days, H=20.3 ~295m) from Spacewatch 1.8m (Sept. 13.19-20p3)
K07R02F 2007 RF2 (arc=8 days, H=20.6 ~257m) from Spacewatch 1.8m (Sept. 13.42-43p3)
K07R01J 2007 RJ1 (small asteroid, arc=11 days, H=25.2 ~31m) from Santa Mama Obs. (Sept. 12.87-90p8), Great Shefford Obs. (Sept. 13.89p3), Balzaretto Obs. (Sept. 13.89-93p5), and Peschiera del Garda Obs. (Sept. 13.95-96p4)
Observations of small asteroids (H>22.0)
K07R15P 2007 RP15 (arc=1 day, H=23.1 ~81m) from Alter Satzberg Obs. (Sept. 13.86p4) and Young/Table Mtn. (Sept. 14.23-24p4)
K07R12V 2007 RV12 (arc=1 day, H=25.7 ~25m) from ARO (Sept. 13.31-32p3)
K07R12S 2007 RS12 (arc=1 day, H=23.2 ~78m) from ARO (Sept. 13.27-29p3)
K07R12P 2007 RP12 (arc=2 days, H=24.5 ~43m) from ARO (Sept. 13.20-22p3)
K07R09Y 2007 RY9 (arc=3 days, H=23.5 ~68m) from Stia Obs. (Sept. 12.82-85p5), Greiner Research Obs. (Sept. 13.08-09p7), and Eschenberg Obs. (Sept. 13.90-91p3)
Observations of other objects
K07R12U 2007 RU12 (arc=1 day, H=19.7 ~389m) from ARO (Sept. 13.29-30p3)
K07R07N 2007 RN7 (arc=21 days, H=21.4 ~178m) from Stia Obs. (Sept. 12.87-88p3)
K07Q02K 2007 QK2 (arc=23 days, H=20.6 ~257m) from LONEOS (Sept. 13.22-29p4)
K07P25H 2007 PH25 (i=53.2°, Q=4.614 AU, arc=31 days, H=16.6 ~1.62 km) from SSS (Sept. 12.72-74p3)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from New Millennium Obs. (Sept. 9.07-13p6), CSS (Sept. 13.38-40p4), and Capannoli Obs. (Sept. 13.88-89p3)
K07P08E 2007 PE8 (arc=122 days, H=19.4 ~446m) from Santa Mama Obs. (Sept. 12.91-93p8), LONEOS (Sept. 13.21-25p3), and Peschiera del Garda Obs. (Sept. 13.89-91p3)
K07O00V 2007 OV (arc=59 days, H=19.2 ~490m) from the Spacewatch 0.9m telescope (Sept. 11.30-33p3), LINEAR (Sept. 13.23-27p4), and LONEOS (Sept. 13.30-38p4)
K07L32R 2007 LR32 (arc=111 days, H=17.2 ~1.23 km) from Cormons Obs. (Sept. 13.76-77p3) and Eschenberg Obs. (Sept. 13.77-78p3)
K07L15A 2007 LA15 (arc=92 days, H=19.5 ~426m) from SSS (Sept. 13.42-44p3)
K07K04N 2007 KN4 (Q=5.446 AU, arc=3 opp, H=16.9 ~1.41 km) from CSS (Sept. 13.37-40p4)
K07H15E 2007 HE15 (arc=144 days, H=19.6 ~407m) from Stia Obs. (Sept. 12.80-81p4) and Herrenberg Obs. (Sept. 13.82-86p5)
K07D41A 2007 DA41 (arc=3 opp, H=17.6 ~1.02 km) from Santa Mama Obs. (Sept. 12.81-85p6) and Stia Obs. (Sept. 12.89-91p5)
K05Y55W 2005 YW55 (arc=4 opp, H=19.4 ~446m) from Spacewatch 1.8m (Sept. 13.40-41p3)
K04O11T 2004 OT11 (arc=3 opp, H=17.3 ~1.17 km) from Herrenberg Obs. (Sept. 13.79-81p7)
K04D44M 2004 DM44 (Q=4.238 AU, arc=2 opp, H=20.7 ~245m) from ARO (Sept. 13.16-18p3)
K02RC9N 2002 RN129 (arc=4 opp, H=18.9 ~562m) from CSS (Sept. 13.23-25p4)
K00R37W 2000 RW37 (arc=3 opp, H=20.0 ~339m) from CSS (Sept. 13.27-29p4)
K00J10N 2000 JN10 (arc=3 opp, H=17.8 ~933m) from CSS (Sept. 12.47-49p4)
K00H14O 2000 HO14 (arc=3 opp, H=18.4 ~708m) from CSS (Sept. 11.27-30p4) and Spacewatch 0.9m (Sept. 13.29-32p3)
J99J03U 1999 JU3 (arc=4 opp, H=19.2 ~490m) from Capannoli Obs. (Sept. 13.00p2)
J98S35F 1998 SF35 (arc=5 opp, H=17.7 ~977m) from Spacewatch 1.8m (Sept. 13.48p2)
J98S15D 1998 SD15 (arc=4 opp, H=19.1 ~513m) from Santa Mama Obs. (Sept. 12.76-79p8), Eschenberg Obs. (Sept. 13.81p7), and Herrenberg Obs. (Sept. 13.84-85p9)
E1874 141874 2002 PO34 from MLS (Sept. 13.19-21p4)
B5052 115052 2003 RD6 from MLS (Sept. 13.14-16p4)
A0756 100756 1998 FM5 from LONEOS (Sept. 13.32-39p4)
90373 90373 2003 SZ219 from CSS (Sept. 11.19-21p4)
89830 89830 2002 CE from LINEAR (Sept. 13.42-46p4)
68350 68350 2001 MK3 from MLS (Sept. 13.13-14p4)
66251 66251 1999 GJ2 from LINEAR (Sept. 13.37-40p4)
53426 53426 1999 SL5 from Santa Mama Obs. (Sept. 12.80-83p8) and Herrenberg Obs. (Sept. 13.83-84p5)
26663 26663 2000 XK47 from MLS (Sept. 13.22-24p4)
26166 26166 1995 QN3 from CSS (Sept. 11.25-27p4)
21277 21277 1996 TO5 from CSS (Sept. 11.19-21p4)
17182 17182 1999 VU from CSS (Sept. 12.32-34p4)
16636 16636 1993 QP from Raheny Obs. (Sept. 10.90p1 & 10.99-03p2) and CSS (Sept. 13.20-22p4)
15745 15745 1991 PM5 from CSS (Sept. 12.47-49p4)
07092 7092 Cadmus (1992 LC) from CSS (Sept. 12.39-41p4)
05143 5143 Heracles (1991 VL) from LONEOS (Sept. 13.22-28p4)
04503 4503 Cleobulus (1989 WM) from LINEAR (Sept. 13.41-46p4)
02212 2212 Hephaistos (1978 SB) from LINEAR (Sept. 13.34-39p4)

Observers on 14 September '07

A total of 33 observing facilities appear in today's MPECs.

Code	Observer / observatory
`B03`	Alter Satzberg Obs. in Austria, 2 in MPECs 2007-R72 & 2007-R75 -- 2007 RQ17, 2007 RP15
`H55`	Astronomical Research Obs. in Illinois, 8 in MPECs 2007-R72, 2007-R75 & 2007-R82 -- 2007 RV12, 2007 RU12, 2007 RT12, 2007 RS12, 2007 RQ17, 2007 RP12, 2005 XL80, 2004 DM44
`A81`	Balzaretto Obs. in Italy, 1 in MPEC 2007-R72 -- 2007 RJ1
`I77`	CEAMIG-REA in Brazil, 4 in MPECs 2007-R75, 2007-R76, 2007-R80 & 2007-R81 -- 2007 RW17, 2007 RV17, 2007 RR17, 2007 RQ17
`B09`	Capannoli Obs. in Italy, 2 in MPEC 2007-R72 -- 2007 PU11, 1999 JU3
`703`	Catalina Sky Survey in Arizona, 14 in MPECs 2007-R72 & 2007-R80 -- 2007 RV17, 2007 PU11, 2007 KN4, 2002 RN129, 2000 RW37, 2000 JN10, 2000 HO14, 90373, 26166, 21277, 17182, 16636, 15745, 7092
`A94`	Cormons Obs. in Italy, 1 in MPEC 2007-R72 -- 2007 LR32
`151`	Eschenberg Obs. in Switzerland, 3 in MPEC 2007-R72 -- 2007 RY9, 2007 LR32, 1998 SD15
`595`	Farra d'Isonzo Obs. in Italy, 2 in MPECs 2007-R75 & 2007-R80 -- 2007 RV17, 2007 RQ17
`651`	Grasslands Obs. in Arizona, 5 in MPECs 2007-R75, 2007-R76, 2007-R79, 2007-R80 & 2007-R81 -- 2007 RW17, 2007 RV17, 2007 RU17, 2007 RR17, 2007 RQ17
`J95`	Great Shefford Obs. in England, 6 in MPECs 2007-R72, 2007-R73, 2007-R75, 2007-R76, 2007-R77 & 2007-R79 -- 2007 RU17, 2007 RS17, 2007 RR17, 2007 RQ17, 2007 RO17, 2007 RJ1
`H51`	Greiner Research Obs. in Wisconsin, 1 in MPEC 2007-R72 -- 2007 RY9
`A17`	Guidestar Obs. in Germany, 1 in MPEC 2007-R75 -- 2007 RQ17
`240`	Herrenberg Obs. in Germany, 4 in MPEC 2007-R72 -- 2007 HE15, 2004 OT11, 1998 SD15, 53426
`704`	LINEAR in New Mexico, 8 in MPECs 2007-R72, 2007-R75 & 2007-R76 -- 2007 RU9, 2007 RR17, 2007 RQ17, 2007 OV, 89830, 66251, 4503, 2212
`699`	LONEOS in Arizona, 5 in MPEC 2007-R72 -- 2007 QK2, 2007 PE8, 2007 OV, 100756, 5143
`D35`	Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2007-R76 -- 2007 RR17
`932`	McCarthy Obs. in Connecticut, 1 in MPEC 2007-R72 -- 2007 RU9
`711`	McDonald Obs. in Texas, 5 in MPECs 2007-R75, 2007-R76, 2007-R79, 2007-R80 & 2007-R81 -- 2007 RW17, 2007 RV17, 2007 RU17, 2007 RR17, 2007 RQ17
`118`	Modra Obs. in Slovakia, 1 in MPEC 2007-R80 -- 2007 RV17
`474`	Mt. John Obs. in New Zealand, 2 in MPECs 2007-R74 & 2007-R81 -- 2007 RW17, 2007 RP17
`G96`	Mt. Lemmon Survey in Arizona, 12 in MPECs 2007-R72, 2007-R73, 2007-R74, 2007-R75, 2007-R77, 2007-R78, 2007-R79 & 2007-R80 -- 2007 RV9, 2007 RV17, 2007 RU17, 2007 RT17, 2007 RS17, 2007 RQ17, 2007 RP17, 2007 RO17, 68350, 26663, 141874, 115052
`A24`	New Millennium Obs. in Italy, 1 in MPEC 2007-R72 -- 2007 PU11
`A53`	Peschiera del Garda Obs. in Italy, 2 in MPEC 2007-R72 -- 2007 RJ1, 2007 PE8
`H59`	Prairie Grass Obs. in Indiana, 2 in MPECs 2007-R75 & 2007-R76 -- 2007 RR17, 2007 RQ17
`J41`	Raheny Obs., 1 in MPEC 2007-R72 -- 16636
`473`	Remanzacco Obs. in Italy, 3 in MPECs 2007-R75, 2007-R76 & 2007-R79 -- 2007 RU17, 2007 RR17, 2007 RQ17
`B38`	Santa Mama Obs. in Italy, 5 in MPEC 2007-R72 -- 2007 RJ1, 2007 PE8, 2007 DA41, 1998 SD15, 53426
`E12`	Siding Spring Survey in New South Wales, 3 in MPECs 2007-R72 & 2007-R81 -- 2007 RW17, 2007 PH25, 2007 LA15
`691`	Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2007-R72 -- 2007 OV, 2000 HO14
`291`	Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2007-R72, 2007-R73, 2007-R77 & 2007-R78 -- 2007 RV9, 2007 RU9, 2007 RT9, 2007 RT17, 2007 RS17, 2007 RR9, 2007 RO17, 2007 RF2, 2005 YW55, 1998 SF35
`A78`	Stia Obs. in Italy, 4 in MPEC 2007-R72 -- 2007 RY9, 2007 RN7, 2007 HE15, 2007 DA41
`6735`	Jim Young via Table Mtn. Obs. in southern California, 3 in MPECs 2007-R72, 2007-R76 & 2007-R80 -- 2007 RV17, 2007 RR17, 2007 RP15

Impact Risk Monitoring on 14 September '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 1929 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is now usually the year 2090.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.
0000NNN000 Object	Risk Monitor	When Noted UTC	0000T0000 Year Range	VI #	000NN00 Prob Cum	T0000 PS Cum	T0000 PS Max	T S	Notes for Today's Latest Risk Assessments

2007 RV9	JPL	1341	2011-2107	67	2.3e-07	-3.82	-4.70	0	JPL: "Analysis based on 22 observations spanning 2.9716 days (2007-Sep-10.28811 to 2007-Sep-13.25976)." Diameter approximately 0.347 km. from mean, weighted H=19.9.
2007 RV9	NEODyS	1341	2011-2090	59	1.69e-07	-3.84	-4.44	0	NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2007/09/10.289 to 2007/09/13.261."

2007 RU9	JPL	1341	2013-2071	27	4.7e-06	-2.46	-2.79	0	JPL: "Analysis based on 36 observations spanning 2.9974 days (2007-Sep-10.28596 to 2007-Sep-13.28338)." Diameter approximately 0.237 km. from mean, weighted H=20.8.
2007 RU9	NEODyS	1341	2013-2076	31	4.41e-06	-2.51	-2.82	0	NEODyS: "Based on 38 optical observations (of which 2 are rejected as outliers) from 2007/09/10.287 to 2007/09/13.284."

2007 RT12	JPL	1341	R E M O V E D						JPL: Risk listing removed at 1329 UTC.

2007 RT9	JPL	1341	2026-2107	24	2.2e-08	-5.15	-5.82	0	JPL: "Analysis based on 22 observations spanning 2.9740 days (2007-Sep-10.28434 to 2007-Sep-13.25829)." Diameter approximately 0.354 km. from mean, weighted H=19.9.
2007 RT9	NEODyS	1341	2024-2088	27	2.82e-08	-5.00	-5.74	0	NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2007/09/10.285 to 2007/09/13.259."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from an orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" for more about this.

Chronology on 14 September '07

Times are UTC for when the items were noted or added by Major News.

1929	Grabbed MPEC 2007-R82 - 2005 XL80 - see above
1840	Added link to news story, "The Super Bolide of September 13" - see above Added link to news story, "Sandia sky camera records fireball" - see above Added link to news story, "Dawn ELV status" - see above Added link to news story, "New Mexico Fireball" - see above
1826	Grabbed MPEC 2007-R73 - 2007 RO17 - see above Grabbed MPEC 2007-R74 - 2007 RP17 - see above Grabbed MPEC 2007-R75 - 2007 RQ17 - see above Grabbed MPEC 2007-R76 - 2007 RR17 - see above Grabbed MPEC 2007-R77 - 2007 RS17 - see above Grabbed MPEC 2007-R78 - 2007 RT17 - see above Grabbed MPEC 2007-R79 - 2007 RU17 - see above Grabbed MPEC 2007-R80 - 2007 RV17 - see above Grabbed MPEC 2007-R81 - 2007 RW17 - see above
1650	Added link to news story, "The Prius of Space" - see above Added link to news story, "Hawaii's observatories and their heavenly views" - see above Added link to news story, "American Indian group protests sale of 10,000-year-old meteorite" - see above
1427	Added MOS paper, "Angular Momemtum of Binary Asteroids: Implication for their possible origin" - see above Added MOS paper, "Origin of the Ocean on the Earth: Early Evolution of Water D/H in a Hydrogen-rich Atmosphere" - see above Added MOS paper, "Self-regulated gravitational accretion in protostellar discs" - see above Added MOS paper, "The use of genetic algorithm to model protoplanetary discs" - see above
1342	Grabbed MPEC 2007-R72 - Daily Orbit Update - see above
1341	Noted that JPL has removed 2007 RT12 as an impact risk - see above Noted that JPL has updated its 2007 RT9 risk assessment - see above Noted that NEODyS has updated its 2007 RT9 risk assessment - see above Noted that JPL has updated its 2007 RU9 risk assessment - see above Noted that NEODyS has updated its 2007 RU9 risk assessment - see above Noted that JPL has updated its 2007 RV9 risk assessment - see above Noted that NEODyS has updated its 2007 RV9 risk assessment - see above

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