95P/Chiron from the HST on 23 April 
1996. Credit Karen J. Meech/HST.

The discovery image of the first centaur, 95P/Chiron, was made thirty years ago today by Charles Kowal with the Mt. Palomar Schmidt telescope. Designated 1977 UB and later numbered 2060, it was found in April 1989 to be cometary by Karen Meech and Michael Belton. The above picture of Chiron's inner coma was made by Meech with the Hubble Space Telescope on 23 April 1996. See Cometography for more info. Credit: Karen J. Meech/HST (image pixel-doubled by A/CC).


Contents  on 18 October '07

Resources:

Note: Marching toward complete automation, we have inaugurated today (October 18th) an RSS news feed RSS news feed that is generated from the same scripts used to produce these daily news pages, replacing previously manual RSS creation. This provides faster and more complex (and surer) linking to both the related A/CC news items and, when available, now also to the original documents. And so this means not only an RSS news feed for A/CC reporting but also for MPECs and active risk assessments. Additionally, this change allows providing an alternate RSS news feed RSS feed for daily news as published on A/CC's backup Web site.

The latest news: framed access (best), RSS news feed RSS news feed (flags updates), or redirection - Note: A/CC has a main Web site and a backup site, which now has its own backup RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days this year through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity  on 18 October '07

The MPC's NEO Confirmation Page has 11 listings: 2 new, 9 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two new and nine updated listings. Of these, nine were "one nighters." So far The Tracking News has counted a total of thirteen 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 18 October '07

Minor Planet Electronic Circulars

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


MPEC 2007-U24 - "19:21 UT" - Comets C/2007 N7, 2007 N8, 2007 O3, 2007 O4 (SOHO)


MPEC 2007-U23 - "19:15 UT" - Comets C/2004 E5, 2007 K21, 2007 N4, 2007 N5, 2007 N6 (SOHO)


MPEC 2007-U22 - "12:02 UT" - 2007 UT


MPEC 2007-U21 - "10:43 UT" - 2007 US


MPEC 2007-U20 - "09:53 UT" - 2007 UR


<< DOU on 18 Oct. '07 >>  MPEC 2007-U19 - "06:10 UT" - Daily Orbit Update

Observers  on 18 October '07

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 1 in MPEC 2007-U21 -- 2007 US
703Catalina Sky Survey (CSS) in Arizona, 28 in MPECs 2007-U19 & 2007-U22 -- 2007 UT, 2007 TG8, 2007 RU17, 2007 RT19, 2007 RM133, 2007 RF5, 2007 RD1, 2007 PE8, 2007 LR32, 2002 UO3, 2000 SQ43, 1998 XC9, 87311, 35107, 21374, 17182, 16816, 16657, 163697, 162980, 162273, 15745, 152787, 143678, 100756, 8034, 7092, 2212
448Desert Moon Obs. in New Mexico, 4 in MPEC 2007-U19 -- 2007 SV11, 2007 RX19, 2007 RL133, 2004 XJ35
203GiaGa Obs. in Italy, 3 in MPEC 2007-U19 -- 2007 TS19, 2007 RF5, 2007 LR32
651Grasslands Obs. in Arizona, 1 in MPEC 2007-U22 -- 2007 UT
987Isle of Man Obs. on the Isle of Man, 4 in MPEC 2007-U19 -- 16636, 163902, 161998, 11500
699LONEOS in Arizona, 4 in MPEC 2007-U19 -- 2007 TL23, 2007 TK8, 2002 SV, 161998
G96Mt. Lemmon Survey (MLS) in Arizona, 16 in MPECs 2007-U19, 2007-U20, 2007-U21 & 2007-U22 -- 2007 UT, 2007 US, 2007 UR, 2007 TK8, 2007 TH19, 2007 TC66, 2007 TB23, 2007 RT146, 2007 PA8, 2007 LQ19, 2004 VW14, 2003 WM7, 2003 SU214, 23548, 12711, 2201
J93Mt. Tuffley Obs. in England, 1 in MPEC 2007-U19 -- 4954
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2007-U19 -- 2007 OV, 2007 LR32, 2001 RY47
510Siegen Obs. in Germany, 5 in MPEC 2007-U19 -- 2007 TS19, 2007 PU11, 2002 RC118, 22771, 4954
2492LASCO Coronagraph 2 (SOHO C2) via the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 5 in MPECs 2007-U23 & 2007-U24 -- C/2007 N7, C/2007 N6, C/2007 N5, C/2007 N4, C/2007 K21
2493LASCO Coronagraph 3 (SOHO C3) via the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 8 in MPECs 2007-U23 & 2007-U24 -- C/2007 O4, C/2007 O3, C/2007 N8, C/2007 N7, C/2007 N6, C/2007 N5, C/2007 N4, C/2004 E5
691Spacewatch 0.9m telescope in Arizona, 18 in MPEC 2007-U19 -- 2007 TX24, 2007 TV24, 2007 TS24, 2007 TK8, 2007 TK15, 2007 TH72, 2007 TD14, 2007 TA25, 2007 SR11, 2007 RQ17, 2007 RQ133, 2007 RP12, 2007 QK2, 2007 PU11, 2005 SS4, 2002 RC118, 85938, 1221
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2007-U19 & 2007-U20 -- 2007 UR, 2007 UH, 2007 TU24, 2007 TK8, 2007 TH72
A78Stia Obs. in Italy, 4 in MPEC 2007-U19 -- 2007 TU24, 2007 TS19, 2007 TJ19, 2007 TH72
G72University Hills Obs. in southern California, 2 in MPEC 2007-U19 -- 2007 TS19, 2007 RF5
138Village-Neuf Obs. in France, 2 in MPEC 2007-U19 -- 2007 RF5, 2007 LR32

Impact Risk Monitoring  on 18 October '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 USJPL Sentry15032015-2101154.5e-09-7.28-7.630JPL: "Analysis based on 11 observations spanning .92225 days (2007-Oct-16.24142 to 2007-Oct-17.163668)." Diameter approximately 0.073 km. from mean, weighted H=23.3.
2007 UHJPL Sentry1356R E M O V E DJPL: Risk listing removed at 1159 UTC.
NEODyS1356R E M O V E D
2007 TH72NEODyS1357208714.94e-09-8.05-8.050NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2007/10/15.204 to 2007/10/18.206."
2007 TU24NEODyS13572045-208851.22e-06-3.58-3.620NEODyS: "Based on 62 optical observations (of which 0 are rejected as outliers) from 2007/10/11.269 to 2007/10/18.192."
JPL Sentry13562039-2104329.0e-06-2.99-3.150JPL: "Analysis based on 62 observations spanning 6.9230 days (2007-Oct-11.26838 to 2007-Oct-18.19134)." Diameter approximately 0.328 km. from mean, weighted H=20.1.
2007 TB23JPL Sentry13562066-210736.7e-07-3.16-3.160JPL: "Analysis based on 48 observations spanning 6.0700 days (2007-Oct-10.38885 to 2007-Oct-16.45887)." Diameter approximately 0.620 km. from mean, weighted H=18.7.
NEODyS1356R E M O V E D
2007 TH19JPL Sentry1356R E M O V E DJPL: Risk listing removed at 1011 UTC.

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 a variant 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" to learn more.

Chronology  on 18 October '07

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

2100Grabbed MPEC 2007-U23 - Comets C/2004 E5, 2007 K21, 2007 N4, 2007 N5, 2007 N6 (SOHO) - see above
Grabbed MPEC 2007-U24 - Comets C/2007 N7, 2007 N8, 2007 O3, 2007 O4 (SOHO) - see above
1502Noted that JPL Sentry has posted 2007 US as an impact risk - see above
1357Noted that NEODyS has updated its 2007 TH72 risk assessment - see above
Noted that NEODyS has updated its 2007 TU24 risk assessment - see above
Grabbed MPEC 2007-U19 - Daily Orbit Update - see above
1356Noted that JPL Sentry has updated its 2007 TB23 risk assessment - see above
Noted that NEODyS has removed 2007 TB23 as an impact risk - see above
Noted that JPL Sentry has removed 2007 TH19 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 TU24 risk assessment - see above
Noted that JPL Sentry has removed 2007 UH as an impact risk - see above
Noted that NEODyS has removed 2007 UH as an impact risk - see above
Grabbed MPEC 2007-U20 - 2007 UR - see above
Grabbed MPEC 2007-U21 - 2007 US - see above
Grabbed MPEC 2007-U22 - 2007 UT - see above