Contents  on 23 January '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 23 January '17

One object reported inside ten LD

There is one asteroidal object reported flying inside ten lunar distances (LD) of our planet today. Intruder 2017 BX, a NHATS target, enters Earth's SOI (sphere of gravitational influence), moving in from 3.68 to 2.10 LD.

Earth passage I D ~Size Distance Today  Notes
0.69 LD Jan. 252017 BX 8 m  2.10 from 3.68 LD enters Earth SOI, intruder, NHATS target - DOU
4.6   LD Feb. 172017 BW 75 m  < 10 LD Feb. 9, uncertainty +/- 2.1000 hours, NHATS target - DOU
7.10 LD Feb. 52013 FK 74 m  < 10 LD Feb. 2
9.1   LD Feb. 42005 VL1 13 m  < 10 LD Feb. 1, uncertainty +/- 15.0000 hours, NHATS target, risk

This report was generated at 2148 UTC with first follow-up for 2017 BX and approaching NHATS target 2017 BW in today's DOU MPEC along with follow-up for 2017 AO4 and, from November, astrometry for (no longer) risk-listed 2016 SJ35.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant 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 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.

Radar Astrometry  on 23 January '17

Radar observation of two objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2310 UTC when the database was dated 23 Jan.

NEOCP Activity  on 23 January '17

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 58 listings on the NEOCP today.

New MPECs  on 23 January '17

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been eight MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2017-B49 - "22:26 UT" - 1997 AC11

MPEC 2017-B48 - "18:25 UT" - 2017 BH3

MPEC 2017-B47 - "17:33 UT" - 2016 EJ203

MPEC 2017-B46 - "17:24 UT" - 2013 CL118

MPEC 2017-B45 - "17:22 UT" - 2008 MU1

<< DOU on 23 Jan. '17 >>  MPEC 2017-B44 - "13:03 UT" - Daily Orbit Update

MPEC 2017-B43 - "02:59 UT" - 2017 BF3

MPEC 2017-B42 - "02:56 UT" - 2017 BE3

Observers  on 23 January '17

A total of 33 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 226514
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2017-B44 -- 2017 AO4, 2016 AU8, 2010 VE, 2003 WM25, 2000 DO1
160Castelmartini Obs. in Italy, 4 in MPEC 2017-B44 -- 203217, 138846, 5131, 1627
107Cavezzo Obs. in Italy, 2 in MPEC 2017-B44 -- 2014 EW24, 2014 AD17
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-B43 -- 2017 BF3
B92Chinon Obs. in France, 1 in MPEC 2017-B44 -- 5693
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2017-B42 & 2017-B43 -- 2017 BF3, 2017 BE3
K88GINOP-KHK, 5 in MPECs 2017-B44 & 2017-B49 -- 2017 BX, 2017 BW, 2017 AM4, 1997 AC11, 8507
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 369264
J95Great Shefford Obs. in England, 3 in MPECs 2017-B42, 2017-B43 & 2017-B44 -- 2017 BX, 2017 BF3, 2017 BE3
196Homburg-Erbach Obs. in Germany, 1 in MPEC 2017-B44 -- 162566
6951Marc W. Buie via Kitt Peak Natl. Obs. (KPNO) in Arizona, 3 in MPEC 2017-B44 -- 2015 PP291, 2015 LH14, 2014 TA36
246KLENOT in the Czech Republic, 1 in MPEC 2017-B49 -- 1997 AC11
W86LCOGT Cerro Tololo B in Chile, 2 in MPECs 2017-B43 & 2017-B48 -- 2017 BH3, 2017 BF3
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-B48 -- 2017 BH3
K38M57 Obs. in Italy, 2 in MPEC 2017-B44 -- 2017 BT, 2001 QE34
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2017-B44 -- 9950
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-B44 -- 2011 WO41
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2017-B44 -- 2015 AZ245
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-B47 -- 2016 EJ203
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-B49 -- 1997 AC11
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-B42 -- 2017 BE3
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2017-B44 -- 2002 LB65
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2017-B43 & 2017-B48 -- 2017 BH3, 2017 BF3
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2017-B44 -- 351545, 349507
L04ROASTERR-1 in Romania, 2 in MPEC 2017-B44 -- 2017 AF5, 2016 PR8
H36Sandlot Obs. in Kansas, 2 in MPEC 2017-B44 -- 2017 BW, 2017 BU
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-B42 -- 2017 BE3
587Sormano Obs. in Italy, 1 in MPEC 2017-B42 -- 2017 BE3
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2017-B44 & 2017-B49 -- 2016 AU8, 1997 AC11
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2017-B49 -- 1997 AC11
926Tenagra II Obs. in Arizona, 12 in MPECs 2017-B42, 2017-B43, 2017-B44, 2017-B45, 2017-B46, 2017-B48 & 2017-B49 -- 2017 BX, 2017 BU, 2017 BK, 2017 BH3, 2017 BF3, 2017 BE3, 2017 AH13, 2017 AE5, 2017 AB14, 2013 CL118, 2008 MU1, 1997 AC11
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-B44 -- 2016 SJ35
G33Wickede Obs. in Germany, 1 in MPEC 2017-B44 -- 4179
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 January '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 and JPL 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 JPL NEO Program Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2017 AM4NEODyS1803R E M O V E D-
JPL Sentry1711R E M O V E DJPL: Risk listing removed at 1459 UTC.
2016 VC18JPL Sentry1711R E M O V E DJPL: Risk listing removed at 1605 UTC.
2016 SJ35JPL Sentry1711R E M O V E DJPL: Risk listing removed at 1500 UTC.
2008 VS4JPL Sentry05382017-21143005.9e-07-5.44-6.600JPL: "Analysis based on 10 observations spanning .08330 days (2008-Nov-07.413 to 2008-Nov-07.4963)." Diameter approximately 0.051 km. from mean, weighted H=24.1.

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 23 January '17

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

2310Grabbed MPEC 2017-B49 - 1997 AC11 - see above
Noted Radar Astrometry database update - see above
2148Generated Traffic Report
1836Grabbed MPEC 2017-B48 - 2017 BH3 - see above
1803Noted that NEODyS has removed 2017 AM4 as an impact risk - see above
Grabbed MPEC 2017-B45 - 2008 MU1 - see above
Grabbed MPEC 2017-B46 - 2013 CL118 - see above
Grabbed MPEC 2017-B47 - 2016 EJ203 - see above
1711Noted that JPL Sentry has removed 2016 SJ35 as an impact risk - see above
Noted that JPL Sentry has removed 2016 VC18 as an impact risk - see above
Noted that JPL Sentry has removed 2017 AM4 as an impact risk - see above
Grabbed MPEC 2017-B44 - Daily Orbit Update - see above
0538Noted that JPL Sentry has updated its 2008 VS4 risk assessment - see above
Grabbed MPEC 2017-B42 - 2017 BE3 - see above
Grabbed MPEC 2017-B43 - 2017 BF3 - see above