Contents  on 9 February '18

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 9 February '18

Nine objects reported inside ten LD

Nine visitors are known to be less than ten lunar distances (LD) from our home planet today. Nearest is intruder 2018 CB, which skims past Earth at 0.18 LD at 2227 UTC, coming in from 1.41 LD and ending the day at only 0.21 LD. Lance Benner today gave the Minor Planet Mailing List a brief summary of radar results so far, saying that this object is "clearly less than 20 meters in diameter," based on imaging resolution and signal strength and bandwidth. He also noted that the rotation period hasn't been determined yet but "isn't extremely fast."

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
0.18 LD today 2018 CB 22 m  0.18 LD Feb. 3 - 16 intruder today, radar/NHATS target, Earth
closest at 2227 UTC - radar, DOU
0.49 LD Feb. 6 2018 CC 17 m  5.11 to 7.46 LD Feb. 2 - 11 intruder - DOU
0.73 LD Jan. 19 2018 BC 4 m  9.84 to 10.30 LD Dec. 30 - today intruder, NHATS target, exits ten LD, risk
1.27 LD Feb. 7 2018 CN 18 m  8.17 to 12.60 LD Feb. 4 - 9 exits ten LD, risk
2.14 LD Feb. 6 2018 CM 9 m  5.34 to 7.36 LD Feb. 2 - 11 risk
2.34 LD Feb. 6 2018 CL 27 m  5.83 to 7.62 LD Feb. 1 - 11 NHATS target
5.31 LD Feb. 4 2018 AH12 14 m  7.27 to 8.07 LD Jan. 28 - Feb. 12 NHATS target
5.65 LD Feb. 11 2018 CX 31 m  7.32 from 9.10 LD yesterday - Feb. 15
6.66 LD Jan. 15 2018 AV2 6 m  7.57 to 7.65 LD Nov. 10 - March 2 NHATS target, natural?

This report was generated at 1918 UTC noting a concerted effort to observe passing intruder 2018 CB both optically (MPEC/DOU) and by radar. Today's DOU MPEC also has first follow-up for approaching objects 2018 CB1 and 2018 CJ and continuing follow-up for outbound intruder 2018 CC, departed objects 2018 BD5 and risk-listed 2018 CK, and distant 2012 OQ, plus astrometry for risk-listed 2017 YV8 from last December, 444584 2006 UK and 171576 1999 VP11 from October, 441987 2010 NY65 from June-July 2017, 484402 2007 XH16 from May 2017, 308635 2005 YU55 from November 2016, and 357439 2004 BL86 from January 2015.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.59 LD Feb. 15 2018 CB1 28 m  16.37 from 18.53 LD Feb. 14 - 16 DOU
3.7   LD Feb. 24* 2017 DR109 10 m  24.1 from 25.8 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
9.26 LD Feb. 20 2018 CJ 63 m  37.10 from 40.57 LD Feb. 19 - 21 DOU
3.76 LD March 7 2017 VR12 267 m  35.20 from 36.52 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  54.2 from 56.4 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* EPU = Earth passage uncertainty


Reading:  NASA has a report on the progress of the New Horizons mission including, in early December, delivering images of 2012 HZ84 and 2012 HE85, "the farthest from Earth ever captured by a spacecraft [and] the closest-ever images of Kuiper Belt objects."



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. "Distant" is used here to describe an object that has approached Earth within ten LD since A/CC began these traffic reports eleven years ago but is not presently coming so close. 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.

Radar Astrometry  on 9 February '18

Radar observation of one object

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


Data update noted at 1702 UTC when the database was dated 8 Feb.

NEOCP Activity  on 9 February '18

The MPC's NEO Confirmation Page has 82 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 82 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 84 listings on the NEOCP today.

New MPECs  on 9 February '18

Minor Planet Electronic Circulars

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


MPEC 2018-C47 - "19:55 UT" - 2018 CB


<< DOU on 9 Feb. '18 >>  MPEC 2018-C46 - "13:04 UT" - Daily Orbit Update


MPEC 2018-C45 - "01:50 UT" - 2017 UR52

Observers  on 9 February '18

A total of 45 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-C46 -- 496005
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2018-C45 & 2018-C46 -- 2018 BR6, 2017 UR52, 2016 FA4, 2014 OY1, 2003 FG, 247156, 159609
T05ATLAS Haleakala in Hawaii, 15 in MPEC 2018-C46 -- 491567, 488803, 484402, 483563, 417581, 413002, 395289, 357022, 302311, 276703, 260141, 192642, 17182, 140158, 138846
T08ATLAS Mauna Loa in Hawaii, 14 in MPEC 2018-C46 -- 2016 BA39, 99907, 87311, 434344, 329520, 326388, 265196, 226198, 17182, 162273, 153349, 141018, 138404, 3122
160Castelmartini Obs. in Italy, 2 in MPEC 2018-C46 -- 152931, 1627
703Catalina Sky Survey (CSS) in Arizona, 135 in MPEC 2018-C46 -- 2018 CJ, 2018 BT6, 2018 BL1, 2017 XH62, 2017 SR32, 2016 CW31, 2016 CL32, 2015 RL82, 2015 NJ3, 2015 DP, 2011 MU, 2009 EV, 2009 CS5, 2005 BS27, 2004 CK39, 96590, 96315, 90075, 87311, 86819, 85628, 68278, 66391, 53435, 53110, 512245, 511808, 511684, 509935, 509523, 508905, 508871, 505667, 504928, 504505, 503293, 500749, 499998, 499307, 498548, 498143, 497232, 497176, 496861, 496818, 496816, 496018, 490684, 488803, 485652, 482650, 471956, 467917, 457768, 455148, 452807, 450894, 450160, 444584, 444193, 443103, 417871, 417201, 415029, 40267, 401954, 381906, 380818, 348314, 338292, 338176, 337228, 333908, 333888, 331510, 326388, 322763, 31221, 30825, 302311, 294739, 285540, 275976, 27346, 265962, 265196, 265187, 262623, 259221, 253841, 253586, 252793, 252399, 248590, 23187, 209924, 203471, 20086, 190208, 189173, 177016, 17511, 172034, 171576, 163692, 162998, 162273, 162215, 162011, 159399, 154991, 144898, 143992, 143404, 142563, 142348, 141670, 141495, 138013, 137925, 137805, 137126, 136849, 136839, 12711, 11500, 111253, 8567, 8037, 7977, 3361, 2212, 1865, 1864, 1627
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-C46 -- 2015 TA145
K51Celado Obs. in Italy, 1 in MPEC 2018-C45 -- 2017 UR52
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2018-C46 -- 2016 NL56, 2015 TA145
K65Cesena Obs. in Italy, 1 in MPEC 2018-C46 -- 505657
V16Dark Sky New Mexico Obs. in New Mexico, 1 in MPEC 2018-C46 -- 505657
W845Lori Allen via DECam in Chile, 1 in MPEC 2018-C46 -- 2017 QQ32
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPEC 2018-C46 -- 85839, 2212
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 2018 CB
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2018 CB
J95Great Shefford Obs. in England, 1 in MPEC 2018-C47 -- 2018 CB
G48Harlingten Research Obs. in New Mexico, 5 in MPEC 2018-C46 -- 2018 BA7, 2017 SR32, 511777, 508912, 3122
196Homburg-Erbach Obs. in Germany, 1 in MPEC 2018-C46 -- 420738
H15ISON New Mexico Obs. in New Mexico, 3 in MPEC 2018-C46 -- 322763, 14402, 141018
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-C47 -- 2018 CB
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-C45 -- 2017 UR52
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-C45 -- 2017 UR52
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-C45 -- 2017 UR52
Q63LCO Siding Spring A in New South Wales, 1 in MPEC 2018-C45 -- 2017 UR52
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-C45 -- 2017 UR52
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2018-C46 -- 468583
C94MASTER-II Tunka in Russia, 1 in MPEC 2018-C46 -- 90416
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-C45 -- 2017 UR52
G96Mt. Lemmon Survey (MLS) in Arizona, 95 in MPECs 2018-C45 & 2018-C46 -- 2018 BS1, 2018 BP1, 2018 BA7, 2017 WE16, 2017 UR52, 2017 UE45, 2016 PL1, 2016 FH14, 2015 WT1, 2015 SS, 2014 WJ70, 2013 RZ73, 2009 SQ103, 2002 EC3, 96744, 90075, 85990, 66400, 65679, 511684, 508967, 504025, 500136, 499307, 498068, 498066, 497232, 496837, 496816, 490684, 488579, 484976, 484757, 483662, 482796, 482533, 481442, 480934, 477465, 475534, 474179, 469445, 456651, 450300, 448628, 444584, 444193, 441987, 388468, 351370, 350964, 350462, 329520, 329291, 326354, 308635, 30825, 306383, 302311, 274138, 265962, 259802, 253586, 236716, 226514, 220839, 20429, 204131, 194126, 190788, 185853, 174881, 16960, 163454, 162998, 162566, 162463, 162215, 162142, 154347, 153201, 152671, 152667, 143624, 141354, 138013, 137126, 137078, 9202, 8201, 6611, 5869, 3361, 2201, 1866
K74Muensterschwarzach Obs. in Germany, 3 in MPEC 2018-C46 -- 505657, 333888, 7977
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-C47 -- 2018 CB
583Odessa-Mayaki Obs. in Ukraine, 1 in MPEC 2018-C46 -- 153415
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2018-C46 -- 8037
F51Pan-STARRS 1 (PS1) in Hawaii, 53 in MPECs 2018-C45 & 2018-C46 -- 2017 YV8, 2017 UR52, 2017 QF17, 2017 AP20, 2016 RO1, 2016 BM1, 2015 VW1, 2015 TK, 2014 XR6, 2012 BV26, 66391, 512244, 512234, 509352, 508772, 506437, 504392, 500749, 495858, 488698, 484462, 480922, 418896, 411611, 387733, 386504, 385186, 376879, 357618, 345646, 307493, 306383, 294739, 293054, 27031, 267221, 265196, 265187, 25916, 253106, 177049, 163696, 163373, 153460, 152667, 137924, 137062, 136770, 136618, 103067, 8034, 5693, 3671
L04ROASTERR-1 in Romania, 1 in MPEC 2018-C46 -- 1999 AF4
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-C46 -- 2018 CC
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2018-C45 -- 2017 UR52
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2018-C46 -- 2018 CB
Y00SONEAR in Brazil, 18 in MPEC 2018-C46 -- 65679, 498918, 495858, 477162, 438452, 389694, 366733, 363814, 357439, 331471, 329437, 22771, 190166, 162117, 138404, 136818, 5604, 5189
G45Space Surveillance Telescope Atom Site in New Mexico, 1 in MPEC 2018-C46 -- 2017 YH
691Spacewatch 0.9m telescope in Arizona, 22 in MPEC 2018-C46 -- 2018 CK, 2018 CJ, 2018 BP5, 2018 BD5, 2018 AJ12, 2017 YH, 2017 YA8, 2017 TA4, 2017 SV20, 2016 CO246, 2015 MT59, 2012 OQ, 2009 SK2, 65679, 474451, 471956, 443103, 281375, 20429, 152667, 11500, 2329
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2018-C45 & 2018-C46 -- 2018 BC3, 2018 AE4, 2017 WD15, 2017 UR52, 2014 HM178
I52Steward Obs. Mt. Lemmon Station in Arizona, 17 in MPECs 2018-C45, 2018-C46 & 2018-C47 -- 2018 CZ, 2018 CY, 2018 CV, 2018 CD1, 2018 CC1, 2018 CB1, 2018 CB, 2018 CA, 2018 BN3, 2018 BJ3, 2018 BH6, 2018 BA7, 2018 AM12, 2017 YM6, 2017 UR52, 2013 RZ73, 2013 QH10
926Tenagra II Obs. in Arizona, 1 in MPEC 2018-C45 -- 2017 UR52
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-C46 -- 2017 XL2
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2018-C46 -- 511684
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 February '18

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.
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
2018 CNNEODyS1702208213.28e-08-8.04-8.040NEODyS: "Based on 40 optical observations (of which 2 are rejected as outliers) from 2018-02-05.350 to 2018-02-07.120."
2018 CMNEODyS17022042-2117127.54e-05-5.59-5.610NEODyS: "Based on 31 optical observations (of which 1 are rejected as outliers) from 2018-02-05.332 to 2018-02-05.975."
2018 CKJPL Sentry17022072-207219.543e-08-7.60-7.600JPL: Computed at 07:59 today Pacific time based on 25 observations spanning 4.9010 days (2018-Feb-04.42012 to 2018-Feb-09.32107). Diameter approximately 0.018 km. from weighted mean H=26.31.
NEODyS17022070-208642.23e-07-7.21-7.320NEODyS: "Based on 22 optical observations (of which 2 are rejected as outliers) from 2018-02-04.421 to 2018-02-08.226."
2018 BP6NEODyS1702211523.63e-07-6.44-6.470NEODyS: "Based on 63 optical observations (of which 11 are rejected as outliers) from 2018-01-27.354 to 2018-02-06.457."
2018 BN6NEODyS17022073-2117137.43e-07-7.18-7.40NEODyS: "Based on 47 optical observations (of which 3 are rejected as outliers) from 2018-01-27.195 to 2018-02-05.279."
2018 BCNEODyS17022082-2113275.0e-05-6.87-7.260NEODyS: "Based on 59 optical observations (of which 1 are rejected as outliers) from 2018-01-17.211 to 2018-01-20.504."
2018 AB12NEODyS17022103-211521.93e-08-7.83-7.990NEODyS: "Based on 63 optical observations (of which 0 are rejected as outliers) from 2018-01-14.378 to 2018-02-08.346."
2018 AE4JPL Sentry1702R E M O V E DJPL: Risk listing removed at 1552 UTC today
NEODyS1702R E M O V E D-
2017 YV8JPL Sentry17022082-2117302.537616e-05-6.08-6.520JPL: Computed at 08:23 today Pacific time based on 17 observations spanning 13.838 days (2017-Dec-22.42245 to 2018-Jan-05.260158). Diameter approximately 0.011 km. from weighted mean H=27.37.
2017 WT28NEODyS17022080-21161204.17e-04-5.27-5.620NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2017-11-28.291 to 2017-12-16.266."

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 9 February '18

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

2002Grabbed MPEC 2018-C47 - 2018 CB - see above
1918Generated Traffic Report
1702Noted that NEODyS has updated its 2017 WT28 risk assessment - see above
Noted that JPL Sentry has updated its 2017 YV8 risk assessment - see above
Noted that NEODyS has updated its 2018 AB12 risk assessment - see above
Noted that JPL Sentry has removed 2018 AE4 as an impact risk - see above
Noted that NEODyS has removed 2018 AE4 as an impact risk - see above
Noted that NEODyS has updated its 2018 BC risk assessment - see above
Noted that NEODyS has updated its 2018 BN6 risk assessment - see above
Noted that NEODyS has updated its 2018 BP6 risk assessment - see above
Noted that JPL Sentry has updated its 2018 CK risk assessment - see above
Noted that NEODyS has posted 2018 CK as an impact risk - see above
Noted that NEODyS has posted 2018 CM as an impact risk - see above
Noted that NEODyS has posted 2018 CN as an impact risk - see above
Grabbed MPEC 2018-C46 - Daily Orbit Update - see above
Noted Radar Astrometry database update - see above
0304Grabbed MPEC 2018-C45 - 2017 UR52 - see above