Contents  on 6 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 6 January '18

Two objects reported inside ten LD

Bulletin - 0008, updated 0020 Jan. 7 UTC:  Two new discoveries of close passers have been announced. These will be added to the next regular traffic report after we obtain and process further details.

Earth passageI D~SizeInside ten LD approx.Notes
0.77 LD at 0425 Jan. 22018 AH102 m Dec. 29 - yesterdayintruder - MPEC
4.62 LD at 1128 Jan. 232018 AJ39 m Jan. 16 - 31MPEC


Two transient natural objects are reported within ten lunar distances (LD) of our planet today. 2017 YD7 travels from 8.47 to 10.51 LD, leaving our ten-LD traffic reporting sphere, while 2017 YS1 remains barely inside, moving from 9.16 to 9.86 LD.

Earth passage I D ~Size Distance today  Inside ten LD Notes
1.93 LD Dec. 24 2017 YS1 6 m  9.16 to 9.86 LD Dec. 11 - tomorrow NHATS target
4.73 LD Jan. 3 2017 YD7 12 m  8.47 to 10.51 LD Dec. 30 - today NHATS target, exits ten LD
Approaching (sorted by 10-LD bubble entry date)
3.7   LD Feb. 24* 2017 DR109 10 m  96.5 from 99.1 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 272 m  79.96 from 81.38 LD Feb. 28 - March 13 radar/NHATS target - DOU
* EPU = Earth passage uncertainty

This report was generated at 1940 UTC with follow-up in today's DOU MPEC for approaching 2017 VR12 and for departed objects 2017 YW3, 2017 YR3, and 2017 XS, plus distant 208023 1999 AQ10.



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 come within ten LD since A/CC began these traffic reports (2007) but is not currently passing 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 6 January '18

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 56 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 6 January '18

Minor Planet Electronic Circulars

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


MPEC 2018-A24 - "23:53 UT" - 2018 AG


MPEC 2018-A23 - "23:50 UT" - 2018 AH


MPEC 2018-A22 - "23:46 UT" - 2018 AJ


MPEC 2018-A21 - "22:21 UT" - 2017 YS8


MPEC 2018-A20 - "22:18 UT" - 2017 YR8


MPEC 2018-A19 - "22:14 UT" - 2017 YQ8


MPEC 2018-A18 - "22:10 UT" - 2017 YP8


<< DOU on 6 Jan. '18 >>  MPEC 2018-A17 - "13:03 UT" - Daily Orbit Update


MPEC 2018-A16 - "04:34 UT" - 2011 LY2

Observers  on 6 January '18

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

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-A24 -- 2018 AG
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-A19 -- 2017 YQ8
T05ATLAS Haleakala in Hawaii, 15 in MPEC 2018-A17 -- 2013 TH5, 2007 AT2, 2007 AG, 53430, 53110, 504928, 21374, 17182, 16657, 153349, 141498, 8567, 8037, 6053, 2368
T08ATLAS Mauna Loa in Hawaii, 8 in MPECs 2018-A17, 2018-A23 & 2018-A24 -- 2018 AH, 2018 AG, 2017 VU14, 435302, 415029, 385580, 294739, 189173
Z36Cancelada Obs., 1 in MPEC 2018-A17 -- 302311
160Castelmartini Obs. in Italy, 15 in MPEC 2018-A17 -- 2017 WX12, 2017 VU14, 507366, 505667, 504887, 438430, 415029, 190208, 189173, 162011, 154988, 143992, 136849, 8567, 2368
703Catalina Sky Survey (CSS) in Arizona, 19 in MPECs 2018-A17 & 2018-A24 -- 2018 AG, 2017 YD8, 2017 QL33, 2014 QW296, 2013 TH5, 1999 AF4, 85818, 438430, 417217, 337228, 21374, 17511, 17182, 16657, 152931, 137805, 111253, 1981, 1866
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-A24 -- 2018 AG
J95Great Shefford Obs. in England, 1 in MPEC 2018-A22 -- 2018 AJ
G48Harlingten Research Obs. in New Mexico, 5 in MPECs 2018-A17 & 2018-A23 -- 2018 AH, 2017 YP4, 2017 YN3, 2017 YD8, 2017 VU14
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-A17 -- 435302
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-A23 -- 2018 AH
I894M. Suzuki in Japan via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2018-A23 -- 2018 AH
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-A24 -- 2018 AG
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 12 in MPECs 2018-A17 & 2018-A18 -- 2017 YV3, 2017 YP8, 2017 XC, 2017 UR4, 2017 RL1, 2016 CU193, 2014 VK2, 2014 AR46, 2013 US3, 2010 JM151, 2005 CR37, 2001 XP31
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2018-A16, 2018-A18, 2018-A19, 2018-A22 & 2018-A23 -- 2018 AJ, 2018 AH, 2017 YQ8, 2017 YP8, 2011 LY2
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-A17 -- 337228
711McDonald Obs. in Texas, 1 in MPEC 2018-A18 -- 2017 YP8
G96Mt. Lemmon Survey (MLS) in Arizona, 19 in MPECs 2018-A16, 2018-A17, 2018-A19, 2018-A20, 2018-A21 & 2018-A22 -- 2018 AJ, 2017 YS8, 2017 YR8, 2017 YQ8, 2017 YD8, 2017 WE2, 2017 VW13, 2017 VB, 2014 YP15, 2014 VU1, 2011 LY2, 2008 DG17, 2005 FL4, 88264, 459451, 423022, 337228, 164207, 10165
C23Olmen Obs. in Belgium, 2 in MPECs 2018-A17 & 2018-A23 -- 2018 AH, 1999 AF4
C27Pallerols Obs. in Spain, 1 in MPEC 2018-A23 -- 2018 AH
F51Pan-STARRS 1 (PS1) in Hawaii, 27 in MPECs 2018-A17, 2018-A18, 2018-A23 & 2018-A24 -- 2018 AH, 2018 AG, 2017 YP8, 2017 XG62, 2017 WW12, 2014 YP15, 2010 VX39, 2010 SA12, 2008 AX28, 55532, 457768, 438452, 349928, 302311, 276703, 265196, 232368, 22753, 209924, 208023, 189700, 161999, 159399, 137078, 136923, 11500, 5863
B49Paus Obs. in Spain, 1 in MPEC 2018-A23 -- 2018 AH
H36Sandlot Obs. in Kansas, 1 in MPEC 2018-A24 -- 2018 AG
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 2 in MPECs 2018-A23 & 2018-A24 -- 2018 AH, 2018 AG
W881Tony Evans in Portugal via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-A17 -- 2015 XK351
691Spacewatch 0.9m telescope in Arizona, 19 in MPECs 2018-A17 & 2018-A24 -- 2018 AG, 2017 YX4, 2017 YO6, 2017 XV2, 2017 XS, 2017 XG62, 2017 XD62, 2017 XB1, 2017 WG2, 2017 UR7, 2017 SV20, 2017 SS19, 2017 RH15, 2016 CL32, 2014 TW57, 2011 EB7, 439908, 322763, 216985
291Spacewatch 1.8m telescope in Arizona, 17 in MPECs 2018-A17 & 2018-A18 -- 2017 YW3, 2017 YU3, 2017 YR4, 2017 YP8, 2017 YE5, 2017 YC1, 2017 XN61, 2017 XC, 2017 VW13, 2017 VR12, 2017 UZ4, 2017 UE45, 2017 SL14, 2017 NK, 2014 AR46, 2012 OD1, 2010 CT
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2018-A17 -- 3122
W34Squirrel Valley Obs. in North Carolina, 3 in MPECs 2018-A17 & 2018-A23 -- 2018 AH, 504928, 276703
I52Steward Obs. Mt. Lemmon Station in Arizona, 15 in MPECs 2018-A16, 2018-A17, 2018-A19, 2018-A20, 2018-A21, 2018-A22 & 2018-A23 -- 2018 AJ, 2018 AH, 2017 YZ, 2017 YY5, 2017 YV7, 2017 YS8, 2017 YR8, 2017 YQ8, 2017 YM6, 2017 YK5, 2017 YJ7, 2017 YC7, 2017 XG62, 2017 WP12, 2011 LY2
926Tenagra II Obs. in Arizona, 13 in MPECs 2018-A17, 2018-A20, 2018-A21, 2018-A23 & 2018-A24 -- 2018 AH, 2018 AG, 2017 YW3, 2017 YS8, 2017 YR8, 2017 YR4, 2017 YR3, 2017 YK5, 2017 YJ7, 2017 YA6, 2017 XT61, 2017 XJ61, 2017 XG62
718Wiggins Obs. in Utah, 1 in MPEC 2018-A23 -- 2018 AH
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 January '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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
2017 YO6NEODyS22042085-211339.33e-10-7.87-7.880NEODyS: "Based on 19 optical observations (of which 1 are rejected as outliers) from 2017-12-26.478 to 2018-01-06.276."
JPL Sentry17002085-211161.0927937e-06-4.81-4.880JPL: Computed at 08:44 today Pacific time based on 19 observations spanning 10.798 days (2017-Dec-26.47691 to 2018-Jan-06.27534). Diameter approximately 0.120 km. from weighted mean H=22.34.
2017 YE5JPL Sentry1632R E M O V E DJPL: Risk listing removed at 1552 UTC today
2017 VW13JPL Sentry16322097-209715.510e-09-6.40-6.400JPL: Computed at 07:55 today Pacific time based on 217 observations spanning 53.762 days (2017-Nov-13.64011 to 2018-Jan-06.40207). Diameter approximately 0.250 km. from weighted mean H=20.65.

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 6 January '18

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

2359Grabbed MPEC 2018-A22 - 2018 AJ - see above
Grabbed MPEC 2018-A23 - 2018 AH - see above
Grabbed MPEC 2018-A24 - 2018 AG - see above
2230Grabbed MPEC 2018-A18 - 2017 YP8 - see above
Grabbed MPEC 2018-A19 - 2017 YQ8 - see above
Grabbed MPEC 2018-A20 - 2017 YR8 - see above
Grabbed MPEC 2018-A21 - 2017 YS8 - see above
2204Noted that NEODyS has updated its 2017 YO6 risk assessment - see above
1940Generated Traffic Report
1700Noted that JPL Sentry has updated its 2017 YO6 risk assessment - see above
1632Noted that JPL Sentry has updated its 2017 VW13 risk assessment - see above
Noted that JPL Sentry has removed 2017 YE5 as an impact risk - see above
1630Grabbed MPEC 2018-A17 - Daily Orbit Update - see above
0503Grabbed MPEC 2018-A16 - 2011 LY2 - see above