22 Jun '07 Major News

Contents on 22 June '07

Minor-Object News -- seven items
Minor-Object Science -- four papers
IAU Minor Planet Center
- NEOCP Activity -- 17 listings: 4 new, 13 updated
- New MPECs -- five MPECs
- Observers -- 43 observing facilities
Impact Risk Monitoring -- one object reported
Chronology

WELCOME to A/CC's prototype daily news publication designed to be the viewing end of a planned autonomous 24-hour news service. The new tools and this publication format are working well enough now to share with readers. It is expected that this approach will require less time to maintain than our previous news and small asteroid pages, which were retired on May 14th. There's still more development ahead and there probably will be some glitches along the way, but this is what's needed to keep up with the increasing pace of minor-object news. The CRT page will be maintained separately for a little while longer, until all of this is working smoothly. And the CRT and small-asteroid ephemerides will be kept going.

Minor-Object News on 22 June '07

"Mystery Object Crashes Through Ceiling," WCVB-TV 21 June - Quote: "At Gerrity Stone in Woburn, they know a lot about rocks. But they can't identify the one that punched a hole through their roof the other day."
"Second annual meteorite festival to rock Haviland, honor volunteers," Pratt Tribune 22 June - Quote: "Haviland will open its doors to visitors on July 6 and 7 when it hosts the 2nd annual Haviland Meteorite Festival on the campus of Barclay College in Haviland."
"Firm warned over helicopter landing in crater," Nunatsiaq News 22 June - Quote: "No helicopters or aircraft may land in or around Nunavik's Pingualuit crater ... to protect its exceptionally clear waters from any contamination. So imagine the surprise felt by scientists and a Pingualuit park warden ... when they spotted a bright yellow helicopter touching down on the frozen lake to refuel last month."
"Dawn mission status," NASA Dawn mission 22 June - Quote: "Spacecraft Mated to Third Stage, and Second Stage Mated to First Stage June 18-22: The spacecraft was connected to the third stage of the launch vehicle at Astrotech. At Space Launch Complex 17B, the second stage was lifted into place on the first stage."
- "NASA Briefing on Upcoming Launch of Asteroid Belt Mission," NASA 21 June - Quote: "NASA has scheduled a news briefing at 2 p.m. EDT, Tuesday, June 26 [at NASA Headquarters in Washington, D.C.], to preview the July 7 launch of the asteroid belt-bound Dawn mission."
"Outer space rocks to the rescue," Kansas City Star 20 June - Quote: "$10,000 worth of meteorites will be part of a raffle for Greensburg recovery efforts."
"Dating the Earth," New York Sun 20 June - Quote: "In effect, radioactivity offered the earth-clock that scientists had long been searching for... By analyzing samples of terrestrial lead, and comparing them to lead from the great meteorite that created the Meteor Crater in Arizona, [Clair] Patterson concluded that the Earth was formed 4.55 billion years ago." - Note: This is a book review of A Natural History of Time by Pascal Richet.

Minor-Object Science on 22 June '07

"Interstellar Dust in the Solar System" by Krueger, Harald with Markus Landgraf, Nicolas Altobelli & Eberhard Gruen, abstract & PDF at arXiv.org 22 June - Quote: "While [the Ulysses spacecraft] monitored the interstellar dust stream at high ecliptic latitudes between 3 and 5 AU, interstellar impactors were also measured with the in-situ dust detectors on board Cassini, Galileo and Helios, covering a heliocentric distance range between 0.3 and 3 AU in the ecliptic plane... We review the results from in-situ interstellar dust measurements in the solar system and present Ulysses' latest interstellar dust data. These data indicate a 30 deg shift in the impact direction of interstellar grains w.r.t. the interstellar helium flow direction, the reason of which is presently unknown."
"Vortex generation in protoplanetary disks with an embedded giant planet" by de Val-Borro, M. with P. Artymowicz, G. D'Angelo & A. Peplinski, abstract & PDF at arXiv.org 22 June - Quote: "Vortices in protoplanetary disks can capture solid particles and form planetary cores within shorter timescales than those involved in the standard core-accretion model. We investigate vortex generation in thin unmagnetized protoplanetary disks with an embedded giant planet... The presence of vortices in protoplanetary disks has implications for planet formation, orbital migration, and angular momentum transport in disks."
"Simulations of the Poynting-Robertson Cosmic Battery in Resistive Accretion Disks" by Christodoulou, Dimitris M. with Ioannis Contopoulos & Demosthenes Kazanas, abstract & PDF at arXiv.org 22 June - Quote: "The secular PR term has dual purpose in these simulations as the source of the magnetic field and the trigger of a magnetorotational instability (MRI) in the disk."
"Exact Solutions of the Isothermal Lane-Emden Equation with Rotation and Implications for the Formation of Planets and Satellites" by Christodoulou, Dimitris M. with Demosthenes Kazanas, abstract & PDF at arXiv.org 22 June - Quote: "We have derived exact solutions of the isothermal Lane-Emden equation with and without rotation in a cylindrical geometry. The corresponding hydrostatic equilibria are most relevant to the dynamics of the protosolar nebula before and during the stages of planet and satellite formation... Based on our results, we expect that quasistatically-evolving protoplanetary disks should develop oscillatory density profiles in their midplanes during their isothermal phase. The peaks in these profiles correspond to local potential minima and their locations are ideal sites for the formation of protoplanets."

NEOCP Activity on 22 June '07

The MPC's NEO Confirmation Page has 17 listings: 4 new, 13 updated

When last checked at 2031 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had four new and thirteen updated listings. Of these, four were "one nighters."

New MPECs on 22 June '07

Minor Planet Electronic Circulars

As of last check at 2031 UTC, there have been five MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-M24 time-stamped "06:06 UT" - Daily Orbit Update - see below
MPEC 2007-M25 time-stamped "15:19 UT" - Comet P/2007 H1 (McNaught) - see below
MPEC 2007-M26 time-stamped "15:24 UT" - Comet C/2007 JA21 (LINEAR) - see below
MPEC 2007-M27 time-stamped "15:28 UT" - Comet C/2007 K4 (Gibbs) - see below
MPEC 2007-M28 time-stamped "15:37 UT" - Observations of Comets

MPEC 2007-M28 - "15:37 UT" - Observations of Comets

PK06F010 P/2006 F1 (Kowalski) from the SZTE Asteroid Program (SZTE) (June 9.00-02p2, 13.98-00p3, 18.99-00p2 & 19.98-02p4)
CK07G010 C/2007 G1 (LINEAR) from Panker Obs. (June 9.97-98p3 & 11.92-94p4), Hiratsuka Obs. (June 12.57-58p3 & 20.57p3), Masquefa Obs. (June 15.98p3), MPC code J55 (June 15.99-00p3 & 19.97-99p3), Montcabre Obs. (June 16.94-95p3), Eschenberg Obs. (June 16.96-97p7), Cordell-Lorenz Obs. (June 17.20-27p4), LONEOS (June 18.18-25p4), Torredembarra Obs. (June 19.02p3), the Catalina Sky Survey (CSS) (June 19.36-38p4), and Ageo Obs. (June 20.65-66p2)
CK07E020 C/2007 E2 (Lovejoy) from Hiratsuka Obs. (June 12.52p3), LINEAR (June 15.23-27p3), Masquefa Obs. (June 15.94-97p3), Montcabre Obs. (June 16.90-91p3), Rodeno Obs. (June 16.92-94p3), SZTE (June 18.86-87p4), Murcia Obs. (June 18.90p3), Hamamatsu-Yuto Obs. (June 19.51-52p3), and MPC code J55 (June 19.94-95p3)
CK06W04D C/2006 WD4 (Lemmon) from Ageo Obs. (June 10.48p2), Montcabre Obs. (June 10.87-88p3), and Hiratsuka Obs. (June 12.46p3)
CK06V13Z C/2006 VZ13 (LINEAR) from Panker Obs. (June 9.95-96p5 & 11.96-98p5), Sumoto Obs. (June 11.76-77p10), Hiratsuka Obs. (June 12.63-64p3 & 20.60-61p3), Montcabre Obs. (June 14.95p2 & 16.00p3), Ageo Obs. (June 15.76-77p2 & 19.77-78p3), Masquefa Obs. (June 16.02p3), Iluro Obs. (June 16.10p3), Hadano Obs. (June 16.67-68p5 & 19.71-72p5), Kitami Obs. (June 17.67p3), RAS Obs. Mayhill (June 18.34-35p2 & 19.40p2), Hamamatsu-Yuto Obs. (June 19.65p4), Szamotuly-Galowo Obs. (June 20.03p2), and SZTE (June 20.04-05p7)
CK06S020 C/2006 S2 (LINEAR) from LINEAR (June 15.33-37p5 & 21.32-36p4), the Spacewatch 0.9m telescope (June 15.42-46p3), and Ageo Obs. (June 15.70p2)
CK06O02F C/2006 OF2 (Broughton) from Ageo Obs. (June 12.70-71p2), Jarnac Obs. (June 20.38-43p3), and Hiratsuka Obs. (June 20.64p3)
CK06M040 C/2006 M4 (SWAN) from Ageo Obs. (May 7.77p2) and the Siding Spring Survey (SSS) (June 15.73p1)
CK05S040 C/2005 S4 (McNaught) from Panker Obs. (June 12.03p3), Hiratsuka Obs. (June 12.62p3), Ageo Obs. (June 12.68-69p2), Kitami Obs. (June 17.63-65p3), and Cordell-Lorenz Obs. (June 22.25-27p2)
CK05L030 C/2005 L3 (McNaught) from Sumoto Obs. (June 11.73p3), Hiratsuka Obs. (June 12.59-60p3 & 20.54p3), Masquefa Obs. (June 16.05-06p3), Kitami Obs. (June 17.58-60p3), Monte Deva Obs. (June 17.00-01p5), Murcia Obs. (June 18.93p3), Vega del Thader Obs. (June 18.95-96p4), MPC code J55 (June 20.01-02p3), and LINEAR (June 20.28-29p3)
CK04B010 C/2004 B1 (LINEAR) from Table Mtn. Obs. (June 8.18-20p4), Hiratsuka Obs. (June 12.53-54p3), and Chante-Perdrix Obs. (June 16.99-01p4)
CK03W42T C/2003 WT42 (LINEAR) from Hiratsuka Obs. (June 12.48p3) and Rodeno Obs. (June 16.90-91p3)
CK02V94Q C/2002 VQ94 (LINEAR) from Hiratsuka Obs. (June 12.55p3), MPC code 688 (June 15.20-22p2), and CSS (June 21.22-24p4)
0125 125P/Spacewatch from LINEAR (June 7.16-20p5) and Kiev Comet Station (Kiev) (June 14.88-91p4)
0099 99P/Kowal 1 from Hiratsuka Obs. (June 12.50p2) and Rodeno Obs. (June 16.95p3)
0096 96P/Machholz 1 from Panker Obs. (June 9.00-01p5 & 12.01-02p5), Sumoto Obs. (June 11.74p13), Hiratsuka Obs. (June 12.61p3 & 20.53p3), Ageo Obs. (June 12.65-66p3), Kiev (June 14.99-00p6), Montcabre Obs. (June 15.95-96p3), Masquefa Obs. (June 16.07p3), Hadano Obs. (June 16.64-65p4), Rodeno Obs. (June 17.03-04p3), Monte Deva Obs. (June 17.98-99p5), Vega del Thader Obs. (June 18.86p4 & 18.94-95p9), Murcia Obs. (June 18.93p3), Posadas Obs. (June 19.91-92p3), MPC code A34 (June 19.91-92p10), and MPC code J55 (June 20.01p3)
0002 2P/Encke from Ageo Obs. (May 27.77p2 & June 15.75p3)

MPEC 2007-M27 - "15:28 UT" - Comet C/2007 K4 (Gibbs)

CK07K040 C/2007 K4 (Gibbs) (i=98.6°, q=3.527 AU, TP=2007 May 3.976 TT) from Spacewatch 0.9m (June 15.36-40p3 & 16.29-33p3) and the Spacewatch 1.8m telescope (June 20.28-29p3)

MPEC 2007-M26 - "15:24 UT" - Comet C/2007 JA21 (LINEAR)

CK07J21A C/2007 JA21 (LINEAR) (i=89.8°, q=5.365 AU, TP=2006 Nov. 13.6058 TT) from Sumoto Obs. (June 11.70p1), CSS (June 15.26-28p4), Montcabre Obs. (June 16.97p3), and Torredembarra Obs. (June 19.96-98p5)

MPEC 2007-M25 - "15:19 UT" - Comet P/2007 H1 (McNaught)

PK07H010 P/2007 H1 (McNaught) (q=2.282 AU, Q=5.078 AU, TP=2007 Aug. 17.2346 TT) from Ageo Obs. (June 12.74p2), Tiki Obs. (June 17.65p1), and Szamotuly-Galowo Obs. (June 20.01-02p2)

<< DOU on 22 June '07 >> MPEC 2007-M24 - "06:06 UT" - Daily Orbit Update

Observations of risk-listed objects
K07L15B 2007 LB15 (arc=8 days, H=19.4 ~446m) from Spacewatch 1.8m (June 21.36-37p3) and FTP education program via Faulkes Telescope North (June 21.52-54p8)
Observations of small asteroids (H>22.0)
K07M04B 2007 MB4 (arc=6 days, H=22.8 ~93m) from Astronomical Research Obs. (ARO) (June 21.19p3) and LINEAR (June 21.22-26p4)
K07M00Q 2007 MQ (Q=4.282 AU, arc=3 days, H=23.6 ~65m) from Greiner Research Obs. (June 20.18p3) and Powell Obs. (June 21.21-22p3)
K07L00T 2007 LT (arc=12 days, H=22.4 ~112m) from LINEAR (June 21.32-35p4)
Observations of almost-small asteroids (21.7<H<=22.0)
K07M00R 2007 MR (arc=3 days, H=21.8 ~148m) from Powell Obs. (June 21.34-35p6)
Observations of other objects
K07M04C 2007 MC4 (arc=2 days, H=21.2 ~195m) from ARO (June 21.12-13p6)
K07M00H 2007 MH (arc=4 days, H=21.0 ~214m) from Jim Young via Table Mtn. Obs. (June 21.36-38p4)
K07M00G 2007 MG (arc=4 days, H=21.0 ~214m) from ARO (June 21.18-19p5) and Spacewatch 1.8m (June 21.24-25p3)
K07L32R 2007 LR32 (arc=27 days, H=17.1 ~1.29 km) from ARO (June 21.28-30p3) and LINEAR (June 21.31-36p10)
K07L15C 2007 LC15 (q=0.343 AU, arc=10 days, H=18.6 ~645m) from the Mt. Lemmon Survey (MLS) (June 21.16-18p4)
K07L15A 2007 LA15 (arc=8 days, H=19.4 ~446m) from CSS (June 21.31-33p4)
K07L00D 2007 LD (arc=14 days, H=19.1 ~513m) from Spacewatch 1.8m (June 21.22-23p3)
K07J02X 2007 JX2 (arc=43 days, H=19.4 ~446m) from Spacewatch 1.8m (June 21.17p3)
K07H82X 2007 HX82 (Q=4.096 AU, arc=56 days, H=20.4 ~282m) from ARO (June 21.21-23p3) and Young/Table Mtn. (June 21.34-36p4)
K06SD4J 2006 SJ134 (arc=2 opp, H=18.0 ~851m) from New Millennium Obs. (Feb. 20.95-97p2, 22.87-92p4 & 22.97-01p2)
K06G00B 2006 GB (arc=2 opp, H=20.3 ~295m) from LONEOS (June 21.17-24p4)
K04X14O 2004 XO14 (Q=4.156 AU, arc=3 opp, H=16.1 ~2.04 km, q=1.185 AU) from ARO (June 21.14-18p3 at V=22.3-5)
K02K04F 2002 KF4 (i=37.2°, Q=4.571 AU, arc=3 opp, H=17.2 ~1.23 km) from LINEAR (June 21.17-22p15)
K02A03Q 2002 AQ3 (i=40.0°, arc=4 opp, H=17.1 ~1.29 km) from LINEAR (June 21.37-40p4)
J99V12L 1999 VL12 (arc=6 opp, H=17.0 ~1.35 km) from MLS (June 21.42-45p4)
J99J06R 1999 JR6 (arc=2 opp, H=18.1 ~812m) from Spacewatch 1.8m (June 21.18-20p3)
J98U01L 1998 UL1 (i=42.0°, arc=5 opp, H=16.6 ~1.62 km) from CSS (June 21.19-21p4)
J95L00G 1995 LG (i=43.6°, q=0.223 AU, arc=4 opp, H=18.7 ~616m) from LINEAR (June 21.33-36p4)
F5341 155341 2006 SA218 from New Millennium Obs. (Feb. 20.91-94p2, 22.88-94p5 & 22.98-02p3)
E5656 145656 4788 P-L from Skylive Obs. (June 17.93-94p3)
E3381 143381 2003 BC21 from New Millennium Obs. (Feb. 20.89-91p2 & 22.97-98p2)
E0158 140158 2001 SX169 from LINEAR (June 21.38-41p4) and Spacewatch 1.8m (June 21.40-45p3)
D8883 138883 2000 YL29 from CSS (June 21.16-18p4)
85275 85275 1994 LY from Thousand Oaks Obs. (June 20.19-23p3, 21.38-41p2 & 21.48p1)
68348 68348 2001 LO7 from Spacewatch 0.9m (June 21.22-26p3)
16636 16636 1993 QP from LONEOS (June 21.35-42p4)
06050 6050 Miwablock (1992 AE) from LINEAR (June 21.22-26p5)
05693 5693 1993 EA from New Millennium Obs. (Feb. 20.96-98p2, 22.87-93p4 & 22.98-02p3)
05626 5626 1991 FE from New Millennium Obs. (Feb. 20.91p1, 20.97p1, 22.88-94p5 & 22.99-03p3)
04257 4257 Ubasti (1987 QA) from CSS (June 21.19-20p3)

Observers on 22 June '07

A total of 43 observing facilities appear in today's MPECs.

`349`	Ageo Obs. in Japan, 10 in MPECs 2007-M25 & 2007-M28 -- C/2007 G1, C/2006 WD4, C/2006 VZ13, C/2006 S2, C/2006 OF2, C/2006 M4, C/2005 S4, 96, 2, P/2007 H1
`H55`	Astronomical Research Obs. in Illinois, 6 in MPEC 2007-M24 -- 2007 MB4, 2007 MC4, 2007 MG, 2007 LR32, 2007 HX82, 2004 XO14
`703`	Catalina Sky Survey in Arizona, 7 in MPECs 2007-M24, 2007-M26 & 2007-M28 -- C/2007 G1, C/2002 VQ94, C/2007 JA21, 2007 LA15, 1998 UL1, 138883, 4257
`A77`	Chante-Perdrix Obs. in France, 1 in MPEC 2007-M28 -- C/2004 B1
`850`	Cordell-Lorenz Obs. in Tennessee, 2 in MPEC 2007-M28 -- C/2007 G1, C/2005 S4
`151`	Eschenberg Obs. in Switzerland, 1 in MPEC 2007-M28 -- C/2007 G1
`F653`	FTP education program via Faulkes Telescope North in Hawaii, 1 in MPEC 2007-M24 -- 2007 LB15
`H51`	Greiner Research Obs. in Wisconsin, 1 in MPEC 2007-M24 -- 2007 MQ
`355`	Hadano Obs. in Japan, 2 in MPEC 2007-M28 -- C/2006 VZ13, 96
`379`	Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2007-M28 -- C/2007 E2, C/2006 VZ13
`D88`	Hiratsuka Obs., 12 in MPEC 2007-M28 -- C/2007 G1, C/2007 E2, C/2006 WD4, C/2006 VZ13, C/2006 OF2, C/2005 S4, C/2005 L3, C/2004 B1, C/2003 WT42, C/2002 VQ94, 99, 96
`B19`	Iluro Obs. in Spain, 1 in MPEC 2007-M28 -- C/2006 VZ13
`G92`	Jarnac Obs. in Arizona, 1 in MPEC 2007-M28 -- C/2006 OF2
`585`	Kiev Comet Station in the Ukraine, 2 in MPEC 2007-M28 -- 125, 96
`400`	Kitami Obs. in Japan, 3 in MPEC 2007-M28 -- C/2006 VZ13, C/2005 S4, C/2005 L3
`704`	LINEAR in New Mexico, 12 in MPECs 2007-M24 & 2007-M28 -- C/2007 E2, C/2006 S2, C/2005 L3, 125, 2007 MB4, 2007 LT, 2007 LR32, 2002 KF4, 2002 AQ3, 1995 LG, 140158, 6050
`699`	LONEOS in Arizona, 3 in MPECs 2007-M24 & 2007-M28 -- C/2007 G1, 2006 GB, 16636
`688`	MPC code 688, 1 in MPEC 2007-M28 -- C/2002 VQ94
`A34`	MPC code A34, 1 in MPEC 2007-M28 -- 96
`J55`	MPC code J55, 4 in MPEC 2007-M28 -- C/2007 G1, C/2007 E2, C/2005 L3, 96
`232`	Masquefa Obs. in Spain, 5 in MPEC 2007-M28 -- C/2007 G1, C/2007 E2, C/2006 VZ13, C/2005 L3, 96
`213`	Montcabre Obs. in Spain, 6 in MPECs 2007-M26 & 2007-M28 -- C/2007 G1, C/2007 E2, C/2006 WD4, C/2006 VZ13, 96, C/2007 JA21
`945`	Monte Deva Obs., 2 in MPEC 2007-M28 -- C/2005 L3, 96
`G96`	Mt. Lemmon Survey in Arizona, 2 in MPEC 2007-M24 -- 2007 LC15, 1999 VL12
`J78`	Murcia Obs. in Spain, 3 in MPEC 2007-M28 -- C/2007 E2, C/2005 L3, 96
`A24`	New Millennium Obs. in Italy, 5 in MPEC 2007-M24 -- 2006 SJ134, 155341, 143381, 5693, 5626
`A32`	Panker Obs. in Germany, 4 in MPEC 2007-M28 -- C/2007 G1, C/2006 VZ13, C/2005 S4, 96
`J53`	Posadas Obs. in Spain, 1 in MPEC 2007-M28 -- 96
`649`	Powell Obs. in Kansas, 2 in MPEC 2007-M24 -- 2007 MQ, 2007 MR
`H06`	RAS Obs. Mayhill in New Mexico, 1 in MPEC 2007-M28 -- C/2006 VZ13
`939`	Rodeno Obs., 4 in MPEC 2007-M28 -- C/2007 E2, C/2003 WT42, 99, 96
`461`	SZTE Asteroid Program in Hungary, 3 in MPEC 2007-M28 -- P/2006 F1, C/2007 E2, C/2006 VZ13
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2007-M28 -- C/2006 M4
`B40`	Skylive Obs. in Italy, 1 in MPEC 2007-M24 -- 145656
`691`	Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2007-M24, 2007-M27 & 2007-M28 -- C/2006 S2, C/2007 K4, 68348
`291`	Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2007-M24 & 2007-M27 -- C/2007 K4, 2007 LB15, 2007 MG, 2007 LD, 2007 JX2, 1999 JR6, 140158
`361`	Sumoto Obs. in Japan, 4 in MPECs 2007-M26 & 2007-M28 -- C/2006 VZ13, C/2005 L3, 96, C/2007 JA21
`B30`	Szamotuly-Galowo Obs. in Poland, 2 in MPECs 2007-M25 & 2007-M28 -- C/2006 VZ13, P/2007 H1
`673`	Table Mtn. Obs. in southern California, 1 in MPEC 2007-M28 -- C/2004 B1
`6735`	Jim Young via Table Mtn. Obs. in southern California, 2 in MPEC 2007-M24 -- 2007 MH, 2007 HX82
`G69`	Thousand Oaks Obs. in southern California, 1 in MPEC 2007-M24 -- 85275
`F85`	Tiki Obs. in Tahiti, 1 in MPEC 2007-M25 -- P/2007 H1
`A03`	Torredembarra Obs., 2 in MPECs 2007-M26 & 2007-M28 -- C/2007 G1, C/2007 JA21
`J70`	Vega del Thader Obs. in Spain, 2 in MPEC 2007-M28 -- C/2005 L3, 96

Impact Risk Monitoring on 22 June '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2032 UTC)
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2080.
For the latest official risk assessments, 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 LB15	JPL	1218	R E M O V E D						JPL: Risk listing removed at 1034 UTC.

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

For a list of all risk-rated objects recently in view, see our ephemerides page.

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 all this.

Chronology on 22 June '07

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

2033	Added link to news story, "Dawn mission status" Added link to news story, "Firm warned over helicopter landing in crater" Added link to news story, "Second annual meteorite festival to rock Haviland, honor volunteers" Added link to news story, "Mystery Object Crashes Through Ceiling"
1611	Grabbed MPEC 2007-M25 - Comet P/2007 H1 (McNaught) - see above Grabbed MPEC 2007-M26 - Comet C/2007 JA21 (LINEAR) - see above Grabbed MPEC 2007-M27 - Comet C/2007 K4 (Gibbs) - see above Grabbed MPEC 2007-M28 - Observations of Comets - see above
1438	Added MOS paper, "Exact Solutions of the Isothermal Lane-Emden Equation with Rotation and Implications for the Formation of Planets and Satellites" - see above Added MOS paper, "Interstellar Dust in the Solar System" - see above Added MOS paper, "Simulations of the Poynting-Robertson Cosmic Battery in Resistive Accretion Disks" - see above Added MOS paper, "Vortex generation in protoplanetary disks with an embedded giant planet" - see above
1307	Added link to news story, "Outer space rocks to the rescue" Added link to news story, "NASA Briefing on Upcoming Launch of Asteroid Belt Mission" Added link to news story, "Dating the Earth"
1218	Noted that JPL has removed 2007 LB15 as an impact risk - see above Grabbed MPEC 2007-M24 - Daily Orbit Update - see above

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