Contents  on 24 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 24 January '17

One object reported inside ten LD

There is one transient natural object reported to be less than ten lunar distances (LD) from our home world today. Intruder and NHATS target 2017 BX enters the Earth-Moon system, coming in from 2.10 to 0.77 LD.

Earth passage I D ~Size Distance Today  Notes
0.69 LD tomorrow2017 BX 8 m  0.77 from 2.10 LD intruder today, NHATS target - DOU
Approaching
4.6   LD Feb. 172017 BW 71 m  < 10 LD Feb. 9, uncertainty +/- 1.1333 hours, NHATS target - DOU
7.10 LD Feb. 52013 FK 78 m  < 10 LD Feb. 2 - DOU
9.1   LD Feb. 42005 VL1 13 m  < 10 LD Feb. 1, uncertainty +/- 15.0000 hours, NHATS target, risk

This report was generated at 2115 UTC with the discovery of departed risk-listed 2017 AT20 announced in today's DOU MPEC. It was observed for 25.05 hours from atop Haleakala and Mauna Kea in Hawaii on January 3rd and 4th and is calculated with an uncertainty of plus-or-minus 23.25 hours to have passed Earth at 1.5 LD on December 24th. The DOU also has follow-up for 2017 BX and approaching objects 2017 BW and 2013 FK, as well as for departed NHATS target 2017 AG5, plus astrometry from last October for 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 24 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 2323 UTC when the database was dated 24 Jan.


Data update noted at 2358 UTC when the database was dated 24 Jan.

NEOCP Activity  on 24 January '17

The MPC's NEO Confirmation Page has 31 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 31 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 55 listings on the NEOCP today.

New MPECs  on 24 January '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.


MPEC 2017-B55 - "14:18 UT" - 2008 CE5


<< DOU on 24 Jan. '17 >>  MPEC 2017-B54 - "13:03 UT" - Daily Orbit Update


MPEC 2017-B53 - "03:16 UT" - 2017 AK21


MPEC 2017-B52 - "02:43 UT" - 2017 BK3


MPEC 2017-B51 - "02:40 UT" - 2017 BM3


MPEC 2017-B50 - "02:37 UT" - 2017 BL3

Observers  on 24 January '17

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-B54 -- 2017 AZ20
251Arecibo in Puerto Rico, 2 in radar -- 96590, 7341
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2017-B54 -- 2017 AZ13, 2017 AG5, 2017 AF5, 2016 YN4, 2016 VY3, 2016 LM8
T05ATLAS Haleakala in Hawaii, 9 in MPEC 2017-B54 -- 2008 CM20, 90075, 54789, 413002, 153951, 138846, 11398, 3103, 433
160Castelmartini Obs. in Italy, 20 in MPEC 2017-B54 -- 2017 AG5, 2014 AD17, 2013 GL8, 2011 WO41, 2003 CR1, 2001 QE34, 480004, 475665, 438955, 413002, 34613, 22753, 153951, 141018, 13651, 7341, 5693, 5626, 3103, 1862
958Dax Obs. in France, 3 in MPECs 2017-B50, 2017-B51 & 2017-B52 -- 2017 BM3, 2017 BL3, 2017 BK3
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2017-B50, 2017-B51 & 2017-B54 -- 2017 BM3, 2017 BL3, 1997 AC11
K88GINOP-KHK, 5 in MPECs 2017-B50, 2017-B51, 2017-B52 & 2017-B54 -- 2017 BX, 2017 BW, 2017 BM3, 2017 BL3, 2017 BK3
253Goldstone DSS-14 70m antenna in southern California, 2 in radar -- 96590, 7341
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-B54 -- 2001 QE34
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-B54 -- 2002 LS32
246KLENOT in the Czech Republic, 9 in MPECs 2017-B50, 2017-B51 & 2017-B54 -- 2017 BX, 2017 BT, 2017 BM3, 2017 BL3, 2017 AG5, 2016 YT8, 2016 XD1, 2016 UU80, 2016 NL15
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2017-B54 -- 192559
Q64LCOGT Siding Spring B in New South Wales, 1 in MPEC 2017-B54 -- 192559
K91LCOGT Sutherland A in South Africa, 2 in MPECs 2017-B53 & 2017-B54 -- 2017 AK21, 192559
K92LCOGT Sutherland B in South Africa, 2 in MPEC 2017-B54 -- 265482, 192559
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-B54 -- 192559
130Lumezzane Obs. in Italy, 7 in MPEC 2017-B54 -- 2016 YT8, 2016 YN4, 2016 UU80, 2016 QN11, 2011 WO41, 34613, 159608
K38M57 Obs. in Italy, 3 in MPECs 2017-B50, 2017-B51 & 2017-B54 -- 2017 BM3, 2017 BL3, 2016 YT8
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-B54 -- 326683
568_Marco Micheli on Mauna Kea in Hawaii, 7 in MPEC 2017-B54 -- 2017 AY20, 2017 AT20, 2017 AR20, 2017 AE21, 2017 AD21, 2017 AB21, 2017 AA21
474Mt. John Obs. in New Zealand, 10 in MPEC 2017-B54 -- 2017 BX, 2017 BW, 2017 BS, 2017 AY13, 2017 AX3, 2017 AP13, 2017 AH13, 2016 YJ8, 2015 BX310, 2014 QC3
A24New Millennium Obs. in Italy, 19 in MPEC 2017-B54 -- 2016 LX48, 68950, 480004, 479325, 470510, 452389, 413260, 370307, 185851, 16834, 162269, 154244, 7341, 5836, 5587, 5143, 3352, 1943, 1863
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-B54 -- 2011 WO41
F51Pan-STARRS 1 (PS1) in Hawaii, 15 in MPECs 2017-B51, 2017-B52, 2017-B53 & 2017-B54 -- 2017 BM3, 2017 BK3, 2017 AZ20, 2017 AY20, 2017 AT20, 2017 AR20, 2017 AK21, 2017 AF21, 2017 AE21, 2017 AD21, 2017 AB21, 2017 AA21, 2016 UT80, 311925, 3352
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 24 in MPEC 2017-B54 -- 2017 BW, 2017 AG5, 2017 AF5, 2016 YN4, 2016 XD1, 2016 UU80, 2016 QN11, 2016 PR8, 2016 NL15, 2016 LM8, 2015 ME54, 2014 EW24, 2014 AD17, 2011 WO41, 2006 OH15, 2005 TF, 2001 QE34, 85990, 385343, 349507, 226198, 203471, 138846, 4179
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPECs 2017-B50, 2017-B51 & 2017-B52 -- 2017 BM3, 2017 BL3, 2017 BK3
L04ROASTERR-1 in Romania, 2 in MPECs 2017-B50 & 2017-B51 -- 2017 BM3, 2017 BL3
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-B51 -- 2017 BM3
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-B55 -- 2008 CE5
Q11Shinshiro Obs., 3 in MPEC 2017-B54 -- 413002, 4179, 3103
G45Space Surveillance Telescope Atom Site (SST Atom Site) in New Mexico, 45 in MPECs 2017-B54 & 2017-B55 -- 2017 BW, 2017 AO13, 2016 YN, 2016 WS9, 2016 NV, 2015 BN509, 2014 AZ51, 2013 FK, 2011 WO41, 2011 QP96, 2010 CM44, 2008 CM20, 2008 CE5, 2006 WS1, 2006 OH15, 2003 CR1, 2000 CE59, 90075, 85804, 482344, 481904, 480934, 477490, 438955, 418900, 413002, 370702, 36017, 351370, 310842, 265482, 22771, 205378, 20255, 198752, 186822, 159608, 143404, 138846, 136635, 108519, 5646, 4055, 3199, 3103
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-B53 -- 2017 AK21
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-B54 -- 2017 AF21
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2017-B50, 2017-B51 & 2017-B52 -- 2017 BM3, 2017 BL3, 2017 BK3
926Tenagra II Obs. in Arizona, 5 in MPECs 2017-B50, 2017-B51, 2017-B52 & 2017-B54 -- 2017 BM3, 2017 BL3, 2017 BK3, 2017 AE5, 2016 YF11
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-B54 -- 2016 SJ35
C51WISE in Earth polar orbit, 3 in MPEC 2017-B54 -- 2017 AG21, 2016 VY5, 96590
C42Xingming Obs. in China, 3 in MPECs 2017-B50, 2017-B51 & 2017-B52 -- 2017 BM3, 2017 BL3, 2017 BK3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 January '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS 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.
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
2017 BL3NEODyS16542060-21172563.27e-06-3.04-3.710NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2017-01-21.655 to 2017-01-24.062."
JPL Sentry07002060-21141573.3e-06-3.03-3.750JPL: "Analysis based on 40 observations spanning 2.4074 days (2017-Jan-21.65427 to 2017-Jan-24.06169)." Diameter approximately 0.301 km. from mean, weighted H=20.3.
2017 AF21JPL Sentry16542032-2108121.9e-08-7.73-8.360JPL: "Analysis based on 7 observations spanning 2.8910 days (2017-Jan-04.42327 to 2017-Jan-07.31426)." Diameter approximately 0.033 km. from mean, weighted H=25.1.
2017 AE21JPL Sentry19332020-2117903.2e-06-4.87-5.420JPL: "Analysis based on 5 observations spanning 1.0383 days (2017-Jan-03.52485 to 2017-Jan-04.563112)." Diameter approximately 0.034 km. from mean, weighted H=25.0.
2017 AB21JPL Sentry17472024-2110255.6e-09-5.80-6.420JPL: "Analysis based on 7 observations spanning .97445 days (2017-Jan-03.46971 to 2017-Jan-04.444158)." Diameter approximately 0.243 km. from mean, weighted H=20.7.
2017 AA21JPL Sentry17472020-21162104.3e-06-5.54-5.850JPL: "Analysis based on 7 observations spanning .98032 days (2017-Jan-03.45994 to 2017-Jan-04.44026)." Diameter approximately 0.021 km. from mean, weighted H=26.0.
2017 AY20JPL Sentry1654202111.5e-10-6.22-6.220JPL: "Analysis based on 7 observations spanning 1.0194 days (2017-Jan-03.41671 to 2017-Jan-04.436077)." Diameter approximately 0.330 km. from mean, weighted H=20.1.
2017 AT20JPL Sentry18422039-21162974.5e-06-6.57-7.120JPL: "Analysis based on 6 observations spanning 1.0436 days (2017-Jan-03.37171 to 2017-Jan-04.415357)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
2017 AR20JPL Sentry1747202311.3e-10-7.02-7.020JPL: "Analysis based on 7 observations spanning 1.1013 days (2017-Jan-03.3104 to 2017-Jan-04.411667)." Diameter approximately 0.190 km. from mean, weighted H=21.3.

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 24 January '17

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

2358Noted Radar Astrometry database update - see above
2323Noted Radar Astrometry database update - see above
2115Generated Traffic Report
1933Noted that JPL Sentry has posted 2017 AE21 as an impact risk - see above
1842Noted that JPL Sentry has posted 2017 AT20 as an impact risk - see above
1747Noted that JPL Sentry has posted 2017 AA21 as an impact risk - see above
Noted that JPL Sentry has posted 2017 AB21 as an impact risk - see above
Noted that JPL Sentry has posted 2017 AR20 as an impact risk - see above
1654Noted that JPL Sentry has posted 2017 AF21 as an impact risk - see above
Noted that JPL Sentry has posted 2017 AY20 as an impact risk - see above
Noted that NEODyS has posted 2017 BL3 as an impact risk - see above
Grabbed MPEC 2017-B54 - Daily Orbit Update - see above
Grabbed MPEC 2017-B55 - 2008 CE5 - see above
0700Noted that JPL Sentry has posted 2017 BL3 as an impact risk - see above
0416Grabbed MPEC 2017-B50 - 2017 BL3 - see above
Grabbed MPEC 2017-B51 - 2017 BM3 - see above
Grabbed MPEC 2017-B52 - 2017 BK3 - see above
Grabbed MPEC 2017-B53 - 2017 AK21 - see above