Contents  on 2 December '17

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection.

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 through a calendar interface. To keep track of what's new each day, watch the Chronology section.

Traffic Report  on 2 December '17

Three objects reported inside ten LD

Three asteroids are known to be within ten lunar distances (LD) of Earth today. Nearest is 2008 WM61, which comes its closest to Earth this time around, reaching 3.67 LD at 1152 UTC.

Earth passage I D ~Size Distance Today  Notes
3.67 LD today2008 WM61 15 m  3.67 LD NHATS target, Earth closest at 1152 UTC
3.72 LD Nov. 292017 WF16 6 m  4.56 to 5.15 LD NHATS target
6.39 LD Nov. 302017 WH2 46 m  8.63 to 11.50 LD exits ten LD

This report was generated at 1706 UTC.

Approaching (sorted by 10-LD bubble entry date)
9.45 LD Dec. 52017 WS13 40 m  < 10 LD Dec. 4
3.35 LD Dec. 142006 XY 54 m  < 10 LD Dec. 5, NHATS target
3.44 LD Dec. 92017 WV12 24 m  < 10 LD Dec. 5
9.71 LD Dec. 142015 XX169 11 m  < 10 LD Dec. 12, NHATS target
3.8   LD Dec. 172017 VT14 100 m  < 10 LD Dec. 13, uncertainty +/- 40 mins., radar target, risk
7.6   LD Dec. 242017 WZ14 31 m  < 10 LD Dec. 18, uncertainty +/- 54 mins., radar/NHATS target
3.7   LD Feb. 242017 DR109 10 m  < 10 LD Feb. 18, uncertainty +/- 30 mins., NHATS target
3.7   LD March 72017 VR12 268 m  < 10 LD Feb. 28, uncertainty +/- 1.2667 hours, radar/NHATS target

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center. This puts a focus on some of the most important and very best NEO observation work, representative of the much larger NEO discovery and tracking effort. Object temporal distances are derived by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 2 December '17

The MPC's NEO Confirmation Page has 37 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 37 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 42 listings on the NEOCP today.

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

New MPECs  on 2 December '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 2 Dec. '17 >>  MPEC 2017-X07 - "13:06 UT" - Daily Orbit Update

MPEC 2017-X06 - "04:19 UT" - Comet C/2017 U5 (Panstarrs)

MPEC 2017-X05 - "03:14 UT" - Minor Planet Center and Https:

MPEC 2017-X04 - "00:36 UT" - 2017 WP28

MPEC 2017-X03 - "00:33 UT" - 2017 WO28

MPEC 2017-X02 - "00:29 UT" - 2017 WN28

Observers  on 2 December '17

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2017-X02, 2017-X03, 2017-X04 & 2017-X06 -- 2017 WP28, 2017 WO28, 2017 WN28, C/2017 U5
160Castelmartini Obs. in Italy, 2 in MPEC 2017-X07 -- 138852, 8037
V06Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 2 in MPECs 2017-X04 & 2017-X06 -- 2017 WP28, C/2017 U5
K51Celado Obs. in Italy, 1 in MPEC 2017-X04 -- 2017 WP28
807.Scott Sheppard via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-X06 -- C/2017 U5
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 17 in MPECs 2017-X06 & 2017-X07 -- 2017 WW, 2017 WU, 2017 WR13, 2017 WR12, 2017 WP13, 2017 WO1, 2017 WN1, 2017 WL14, 2017 WG1, 2017 WB13, 2017 VL15, 2017 VG15, 2017 VG13, 2017 UP44, C/2017 U5, 2003 UW29, 497113
006Fabra Obs. in Spain, 2 in MPEC 2017-X07 -- 163696, 140158
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-X06 -- C/2017 U5
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-X07 -- 2017 NL6
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2017-X06 -- C/2017 U5
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2017-X04 & 2017-X06 -- 2017 WP28, C/2017 U5
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2017-X07 -- 3200
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-X02 -- 2017 WN28
711McDonald Obs. in Texas, 1 in MPEC 2017-X06 -- C/2017 U5
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2017-X04 & 2017-X06 -- 2017 WP28, C/2017 U5
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2017-X02, 2017-X03 & 2017-X06 -- 2017 WO28, 2017 WN28, C/2017 U5
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2017-X07 -- 2017 WX12
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-X06 -- C/2017 U5
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-X06 -- C/2017 U5
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPECs 2017-X03, 2017-X04 & 2017-X06 -- 2017 WP28, 2017 WO28, C/2017 U5
926Tenagra II Obs. in Arizona, 2 in MPECs 2017-X03 & 2017-X04 -- 2017 WP28, 2017 WO28
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-X07 -- 2007 RU17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 December '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the NASA/JPL Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2010 GZ60JPL Sentry19112017-21164795.4241241e-06-0.80-1.750JPL: Computed at 13:26 April 18th Pacific time based on 14 observations spanning 1.2571 days (2010-Apr-05.71913 to 2010-Apr-06.97621). Diameter approximately 2.000 km. from weighted mean H=16.14.
2007 YMNEODyS15402018-21151489.54e-06-5.63-6.490NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2007-12-17.397 to 2007-12-17.525."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

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 2 December '17

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

1911Noted that JPL Sentry has updated its 2010 GZ60 risk assessment - see above
1706Generated Traffic Report
1540Noted that NEODyS has updated its 2007 YM risk assessment - see above
Grabbed MPEC 2017-X07 - Daily Orbit Update - see above
0430Grabbed MPEC 2017-X05 - Minor Planet Center and Https: - see above
Grabbed MPEC 2017-X06 - Comet C/2017 U5 (Panstarrs) - see above
0100Grabbed MPEC 2017-X02 - 2017 WN28 - see above
Grabbed MPEC 2017-X03 - 2017 WO28 - see above
Grabbed MPEC 2017-X04 - 2017 WP28 - see above