20 Aug '07 Major News

Contents on 20 August '07

Minor-Object News -- one item
Minor-Object Science -- two papers
IAU Minor Planet Center
- NEOCP Activity
- New MPECs -- one MPEC
- Observers -- five observing facilities
Impact Risk Monitoring -- one object reported
Chronology

Resources:

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Minor-Object News on 20 August '07

Star Formation Newsletter: The August 19th edition (329Kb PDF) of the Star Formation Newsletter publishes abstracts for a couple dozen newly accepted papers, some with public PDF links, that deal with star formation from the molecular cloud stage on through to circumstellar disks and planet formation. A postdoc research position of two to three years is announced at Leiden University in the Netherlands to study millimeter and far infrared observations of protoplanetary disks. {permalink}

Minor-Object Science on 20 August '07

"The circumbinary disk of HD 98800 B: Evidence for disk warping" by Akeson, R. L. with W.K.M. Rice, A.F. Boden & 3 others, abstract & PDF at arXiv.org 20 Aug. - Quote: "The quadruple young stellar system HD 98800 consists of two spectroscopic binary pairs with a circumbinary disk around the B component. Recent work by Boden and collaborators ... resulted in a determination of the physical orbit for HD 98800 B... We next constructed a dynamical model to investigate the influence of the A component, which is not in the Ba-Bb orbital plane, on the B disk. We find that these interactions have a substantial impact on the inclination of the B circumbinary disk with respect to the Ba-Bb orbital plane... We then discuss whether the somewhat unusual properties of the HD 98800 B disk are consistent with material remnant from the star formation process or with more recent creation by collisions from larger bodies." {permalink}
"New Radio Sources and the Composite Structure of Component B in the Very Young Protostellar System IRAS 16293-2422" by Loinard, Laurent with Claire J. Chandler, Luis F. Rodriguez & 4 others, abstract & PDF at arXiv.org 20 Aug. - Quote: "In this article, we report ... Very Large Array 0.7 and 1.3 cm observations of the young stellar system IRAS 16293-2422 in rho-Ophiuchus. In the 0.7 cm image, component A to the south-east of the system looks like its usual binary self. In the new 1.3 cm image, however, component A2 appears to have split into two sub-components located roughly symmetrically around the original position of A2. This change of morphology is likely the result of a recent bipolar ejection, one of the very first such events observed in a low-mass source. Also in component A, a marginal detection of 0.7 cm emission associated with the submillimeter component Ab is reported. If confirmed, this detection would imply that Ab is a relatively extended dusty structure, where grain coagulation may already have taken place... [The] emission from component B to the north-west of the system is confirmed to be dominated by optically thick thermal dust emission associated with a fairly massive, nearly face-on, circumstellar disk." {permalink}

NEOCP Activity on 20 August '07

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by Major News as active yet today (last checked at 2354 UTC).

New MPECs on 20 August '07

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 20 Aug. '07 >> MPEC 2007-Q12 - "06:09 UT" - Daily Orbit Update

Observations of risk-listed objects
K07P27V 2007 PV27 (arc=4 days, H=20.4 ~282m) from Klet Obs. (Aug. 18.94p4)
Observations of other objects
K07P28F 2007 PF28 (arc=5 days, H=19.0 ~537m) from Klet Obs. (Aug. 18.90-91p6), Stammersdorf Obs. (Aug. 19.96p3), and Table Mtn. Obs. (Aug. 20.22-24p4)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.4 ~1.78 km) from Klet Obs. (Aug. 18.98-99p6)
K07P09P 2007 PP9 (arc=8 days, H=21.3 ~186m) from Klet Obs. (Aug. 18.91p6)
K07P08B 2007 PB8 (arc=9 days, H=20.7 ~245m) from Klet Obs. (Aug. 18.96p4)
K07N05C 2007 NC5 (q=0.277 AU, Q=4.617 AU, arc=45 days, H=18.0 ~851m) from New Millennium Obs. (Aug. 18.04-06p3)
K07L32R 2007 LR32 (arc=86 days, H=17.2 ~1.23 km) from New Millennium Obs. (Aug. 18.03-07p6) and Wildberg Obs. (Aug. 19.82-83p5)
K07H15E 2007 HE15 (arc=118 days, H=19.6 ~407m) from Klet Obs. (Aug. 19.00-01p7)
K07D08K 2007 DK8 (arc=183 days, H=19.0 ~537m) from Klet Obs. (Aug. 18.97-98p5)
K07C26K 2007 CK26 (arc=2 opp, H=19.0 ~537m) from New Millennium Obs. (Aug. 17.95-99p5)
K03SM2W 2003 SW222 (arc=3 opp, H=17.2 ~1.23 km) from Wildberg Obs. (Aug. 19.84-86p5)
K01Q34C 2001 QC34 (arc=2 opp, H=20.0 ~339m) from Wildberg Obs. (Aug. 19.88p2)
E5656 145656 4788 P-L from New Millennium Obs. (Aug. 17.87-91p6)
86324 86324 1999 WA2 from New Millennium Obs. (Aug. 17.89-93p6)
85275 85275 1994 LY from New Millennium Obs. (Aug. 17.87-91p4)

Observers on 20 August '07

Five observing facilities appear in today's MPECs.

Code	Observer / observatory
`046`	Klet Obs. in the Czech Republic, 7 in MPEC 2007-Q12 -- 2007 PV27, 2007 PU11, 2007 PP9, 2007 PF28, 2007 PB8, 2007 HE15, 2007 DK8
`A24`	New Millennium Obs. in Italy, 6 in MPEC 2007-Q12 -- 2007 NC5, 2007 LR32, 2007 CK26, 86324, 85275, 145656
`A97`	Stammersdorf Obs. in Austria, 1 in MPEC 2007-Q12 -- 2007 PF28
`673`	Table Mtn. Obs. in southern California, 1 in MPEC 2007-Q12 -- 2007 PF28
`198`	Wildberg Obs. in Germany, 3 in MPEC 2007-Q12 -- 2007 LR32, 2003 SW222, 2001 QC34

Impact Risk Monitoring on 20 August '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2354 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 PV27	NEODyS	1856	2031-2082	26	1.48e-06	-3.40	-3.90	0	NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2007/08/14.567 to 2007/08/18.943."
2007 PV27	JPL	1408	2031-2105	22	1.9e-06	-3.30	-3.86	0	JPL: "Analysis based on 35 observations spanning 4.3759 days (2007-Aug-14.56587 to 2007-Aug-18.94182)." Diameter approximately 0.280 km. from mean, weighted H=20.4.

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 20 August '07

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

1856	Noted that NEODyS has updated its 2007 PV27 risk assessment - see above
1557	Added news report, "Star Formation Newsletter"
1500	Added MOS paper, "New Radio Sources and the Composite Structure of Component B in the Very Young Protostellar System IRAS 16293-2422" - see above Added MOS paper, "The circumbinary disk of HD 98800 B: Evidence for disk warping" - see above
1409	Grabbed MPEC 2007-Q12 - Daily Orbit Update - see above
1408	Noted that JPL has updated its 2007 PV27 risk assessment - see above The NEOCP has become empty

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