Contents  on 21 January '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 21 January '18

Nine objects reported inside ten LD

There are nine minor planets known to be within ten lunar distances (LD) of our home world today. Risk-listed intruder 2018 BC leaves the Earth-Moon system, moving out from 0.96 to 1.35 LD, and intruder 2018 BX exits Earth's SOI, going from 1.52 to 2.71 LD.

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
0.10 LD Jan. 18 2018 BD 3 m  4.75 to 6.77 LD Jan. 13 - 23 intruder, NHATS target, risk - DOU
0.34 LD Jan. 16 2018 BR1 4 m  8.56 to 10.48 LD Jan. 11 - 21 intruder, exits ten LD
0.43 LD Jan. 15 2018 BW 8 m  7.93 to 9.40 LD Jan. 8 - 22 intruder, NHATS target
0.73 LD Jan. 19 2018 BX 5 m  1.52 to 2.71 LD Jan. 12 - 27 intruder, NHATS target, exits Earth SOI
0.73 LD Jan. 19 2018 BC 4 m  0.96 to 1.35 LD Dec. 30 - Feb. 9 intruder today, NHATS target, inside Earth SOI, risk
1.40 LD Jan. 17 2018 AG4 22 m  7.45 to 9.47 LD Jan. 12 - 22 NHATS target
4.64 LD Jan. 23 2018 AJ 39 m  5.02 from 5.61 LD Jan. 16 - 30 NHATS target - DOU
6.7   LD Jan. 15* 2018 AV2 6 m  6.7 to 6.7 LD Nov. 9 - March 2 EPU +/- 14 mins.*, NHATS target, natural?
6.97 LD Jan. 23 2018 AK12 31 m  9.24 from 13.10 LD today - Jan. 24 enters ten LD

This report was generated at 1840 UTC with first follow-up for departed risk-listed 2018 BH1 in today's DOU MPEC along with additional observation of outbound intruder 2018 BD and continuing follow-up for inbound 2018 AJ and distant objects 450894 2008 BT18 and 208023 1999 AQ10.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.27 LD Jan. 27 2018 BQ 26 m  10.17 from 10.50 LD tomorrow - Feb. 1 NHATS target
3.1   LD Jan. 27* 2018 BU1 42 m  13.6 from 16.1 LD Jan. 23 - 30 EPU +/- 6 mins.*
8.01 LD Jan. 26 2018 AL12 34 m  19.59 from 23.66 LD Jan. 24 - 27 risk
5.3   LD Feb. 4* 2018 AH12 14 m  16.5 from 17.6 LD Jan. 28 - Feb. 12 EPU +/- 6 mins.*, NHATS target
3.7   LD Feb. 24* 2017 DR109 10 m  60.5 from 62.7 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 271 m  59.89 from 61.19 LD Feb. 28 - March 13 radar/NHATS target
6.9   LD March 10* 2015 DK200 26 m  100.4 from 103.1 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
* EPU = Earth passage uncertainty



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 objects that have approached Earth within ten LD since A/CC began these traffic reports eleven years ago but are 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.

NEOCP Activity  on 21 January '18

The MPC's NEO Confirmation Page has 114 listings

When last checked at 2324 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 114 objects listed. Of these, 75 were "one nighters." The Tracking News counted a total of 116 listings on the NEOCP on this day.

New MPECs  on 21 January '18

Minor Planet Electronic Circulars

There were nine MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-B89 - "23:53 UT" - 2018 BB3


MPEC 2018-B88 - "23:49 UT" - 2018 BC3


MPEC 2018-B87 - "23:45 UT" - 2018 BA3


MPEC 2018-B86 - "23:41 UT" - 2018 BZ2


MPEC 2018-B85 - "23:37 UT" - 2018 BY2


MPEC 2018-B84 - "23:33 UT" - 2018 BX2


MPEC 2018-B83 - "23:30 UT" - 2018 AM18


MPEC 2018-B82 - "23:26 UT" - 2018 AL18


<< DOU on 21 Jan. '18 >>  MPEC 2018-B81 - "13:05 UT" - Daily Orbit Update

Observers  on 21 January '18

A total of 34 observers appeared in this day's MPECs.

CodeObserver / observatory
T08ATLAS Mauna Loa in Hawaii, 24 in MPEC 2018-B81 -- 2018 AJ, 2017 YP4, 2017 YN3, 2017 QL33, 96590, 475967, 374851, 36284, 281365, 208023, 17511, 16657, 163696, 154347, 137924, 137052, 12711, 111253, 11066, 6053, 3122, 1981, 1864, 1580
160Castelmartini Obs. in Italy, 18 in MPEC 2018-B81 -- 2018 AG, 2017 QL33, 2016 AU8, 2015 YR1, 2004 BB, 2003 UO12, 1999 AF4, 68278, 496818, 439908, 385580, 333888, 302311, 153349, 138013, 8567, 7977, 2368
703Catalina Sky Survey (CSS) in Arizona, 32 in MPECs 2018-B81, 2018-B85, 2018-B87 & 2018-B89 -- 2018 BY2, 2018 BD, 2018 BB3, 2018 BA3, 2018 AM12, 2017 YC8, 2015 OX78, 2015 BS509, 96189, 85953, 495848, 475354, 399611, 341816, 338176, 265196, 244977, 243566, 163691, 15817, 154652, 152563, 14402, 142040, 138013, 137126, 136793, 11405, 10563, 100926, 2329, 2202
K51Celado Obs. in Italy, 1 in MPEC 2018-B86 -- 2018 BZ2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2018-B82, 2018-B84 & 2018-B85 -- 2018 BY2, 2018 BX2, 2018 AL18
734Farpoint Obs. in Kansas, 1 in MPEC 2018-B88 -- 2018 BC3
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-B89 -- 2018 BB3
J95Great Shefford Obs. in England, 2 in MPECs 2018-B86 & 2018-B89 -- 2018 BZ2, 2018 BB3
W89LCO Cerro Tololo Aqawan A#1 in Chile, 1 in MPEC 2018-B85 -- 2018 BY2
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2018-B84, 2018-B85, 2018-B86, 2018-B87, 2018-B88 & 2018-B89 -- 2018 BZ2, 2018 BY2, 2018 BX2, 2018 BC3, 2018 BB3, 2018 BA3
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-B81 -- 162011
568_Marco Micheli on Mauna Kea in Hawaii, 5 in MPECs 2018-B81, 2018-B82, 2018-B83, 2018-B84 & 2018-B85 -- 2018 BY2, 2018 BX2, 2018 BS1, 2018 AM18, 2018 AL18
711McDonald Obs. in Texas, 1 in MPEC 2018-B82 -- 2018 AL18
G96Mt. Lemmon Survey (MLS) in Arizona, 29 in MPECs 2018-B81, 2018-B86, 2018-B87 & 2018-B88 -- 2018 BZ2, 2018 BC3, 2018 BA3, 2018 AY, 2018 AQ2, 2018 AL3, 2018 AG, 2018 AD4, 2017 YY5, 2017 YR4, 2017 XR60, 2016 AU8, 2016 AG165, 2015 DE198, 2014 QW296, 2000 BL19, 88188, 397471, 334673, 242216, 22771, 21374, 202435, 185853, 177255, 17511, 143651, 6053, 1981
408Nyukasa Obs. in Japan, 1 in MPEC 2018-B81 -- 2018 BT1
F51Pan-STARRS 1 (PS1) in Hawaii, 35 in MPECs 2018-B81, 2018-B82, 2018-B83, 2018-B84, 2018-B85 & 2018-B88 -- 2018 BY2, 2018 BX2, 2018 BV1, 2018 BK1, 2018 BJ1, 2018 BC3, 2018 AN3, 2018 AM18, 2018 AL18, 2018 AJ, 2017 QO17, 2017 QJ18, 2015 YA10, 2015 FO124, 2014 BS32, 2013 VM13, 2013 UX14, 2013 BR45, 2008 EQ7, 2002 CY58, 1999 AF4, 505667, 490354, 488698, 450894, 439908, 409934, 330825, 267221, 212546, 162038, 142348, 7839, 6053, 3102
K63Pascoli Obs. in Italy, 3 in MPECs 2018-B87, 2018-B88 & 2018-B89 -- 2018 BC3, 2018 BB3, 2018 BA3
H23Pear Tree Obs. in Florida, 1 in MPEC 2018-B81 -- 143992
W98Polonia Obs. in Chile, 1 in MPEC 2018-B81 -- 162038
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2018-B87 & 2018-B88 -- 2018 BC3, 2018 BA3
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-B85 -- 2018 BY2
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2018-B85 -- 2018 BY2
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-B89 -- 2018 BB3
033Schwarzschild Obs. in Germany, 4 in MPECs 2018-B86, 2018-B87, 2018-B88 & 2018-B89 -- 2018 BZ2, 2018 BC3, 2018 BB3, 2018 BA3
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-B86 -- 2018 BZ2
Y00SONEAR in Brazil, 1 in MPEC 2018-B81 -- 1999 AF4
587Sormano Obs. in Italy, 3 in MPECs 2018-B85, 2018-B86 & 2018-B89 -- 2018 BZ2, 2018 BY2, 2018 BB3
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2018-B81 & 2018-B82 -- 2018 AL18, 2017 UX5, 2009 HB82, 2007 BB50, 2006 XH1, 31346
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2018-B81 & 2018-B82 -- 2018 BT, 2018 BH1, 2018 AY11, 2018 AL18
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-B81 -- 154347
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPECs 2018-B81, 2018-B82, 2018-B85, 2018-B86, 2018-B87, 2018-B88 & 2018-B89 -- 2018 BZ2, 2018 BY2, 2018 BS, 2018 BC3, 2018 BB3, 2018 BA3, 2018 AM3, 2018 AL18, 2017 YV7
Z52The Studios Obs., 2 in MPEC 2018-B81 -- 154347, 3122
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-B81 -- 2018 BP
L01Visnjan Obs., 1 in MPEC 2018-B88 -- 2018 BC3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 January '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2324 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 BL1NEODyS17002044-210951.72e-09-7.55-7.60NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2018-01-16.417 to 2018-01-20.281."
2018 BH1JPL Sentry1700R E M O V E DJPL: Risk listing removed at 1635 UTC today
2018 BPJPL Sentry17002046-2117438.790489e-07-3.87-4.390JPL: Computed at 08:49 today Pacific time based on 42 observations spanning 4.0902 days (2018-Jan-16.15431 to 2018-Jan-20.244543). Diameter approximately 0.270 km. from weighted mean H=20.51.
NEODyS17002046-210584.6e-08-5.08-5.240NEODyS: "Based on 38 optical observations (of which 5 are rejected as outliers) from 2018-01-16.155 to 2018-01-20.182."
2018 BDJPL Sentry17002032-209286.197614e-05-6.23-6.230JPL: Computed at 08:58 today Pacific time based on 30 observations spanning .23350 days (2018-Jan-18.27721 to 2018-Jan-18.51071). Diameter approximately 0.003 km. from weighted mean H=30.16.
2018 AL12NEODyS1700211711.72e-10-9.84-9.840NEODyS: "Based on 16 optical observations (of which 2 are rejected as outliers) from 2018-01-14.557 to 2018-01-19.504."
2018 AB12NEODyS17002110-211628.84e-09-8.17-8.280NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2018-01-14.378 to 2018-01-20.275."
2018 AE4NEODyS1700211011.82e-08-7.80-7.80NEODyS: "Based on 34 optical observations (of which 4 are rejected as outliers) from 2018-01-13.463 to 2018-01-19.549."
2017 XO2NEODyS17002057-207041.8e-04-2.36-2.361NEODyS: "Based on 34 optical observations (of which 2 are rejected as outliers) from 2017-12-10.337 to 2018-01-20.229."

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 21 January '18

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

0001 1/22Grabbed MPEC 2018-B82 - 2018 AL18 - see above
Grabbed MPEC 2018-B83 - 2018 AM18 - see above
Grabbed MPEC 2018-B84 - 2018 BX2 - see above
Grabbed MPEC 2018-B85 - 2018 BY2 - see above
Grabbed MPEC 2018-B86 - 2018 BZ2 - see above
Grabbed MPEC 2018-B87 - 2018 BA3 - see above
Grabbed MPEC 2018-B88 - 2018 BC3 - see above
Grabbed MPEC 2018-B89 - 2018 BB3 - see above
1840Generated Traffic Report
1700Noted that NEODyS has updated its 2017 XO2 risk assessment - see above
Noted that NEODyS has updated its 2018 AB12 risk assessment - see above
Noted that NEODyS has updated its 2018 AE4 risk assessment - see above
Noted that NEODyS has posted 2018 AL12 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 BD risk assessment - see above
Noted that JPL Sentry has removed 2018 BH1 as an impact risk - see above
Noted that NEODyS has posted 2018 BL1 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 BP risk assessment - see above
Noted that NEODyS has updated its 2018 BP risk assessment - see above
Grabbed MPEC 2018-B81 - Daily Orbit Update - see above