Contents  on 13 April '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 13 April '18

Ten objects reported inside ten LD

Ten planetesimals are reported inside ten lunar distances (LD) of Earth today. Nearest is outbound risk-listed intruder 2018 GD2, which passed the Moon at 0.86 LD at 0037 UTC on its way out of the Earth-Moon system, and will end the day at 2.38 LD from Earth.

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
0.78 LD yesterday 2018 GD2 4 m  0.94 to 2.38 LD April 6 - 18 intruder today, NHATS target, Moon closest
0.86 LD at 0037 UTC, risk
1.39 LD April 3 2018 GZ 10 m  6.76 to 7.41 LD March 19 - April 17 NHATS target, risk - DOU
1.41 LD April 10 2018 GE2 15 m  4.29 to 5.61 LD April 2 - 17 NEW, risk - MPEC
2.00 LD April 9 2018 GN1 11 m  6.45 to 8.36 LD April 4 - 14 DOU
4.06 LD April 3 2018 GE 11 m  5.73 to 6.04 LD March 13 - April 24 NHATS target
4.36 LD today 2018 GP 13 m  4.36 LD April 8 - 18 Earth closest at 1104 UTC
4.68 LD April 11 2018 GG 41 m  5.77 to 8.02 LD April 9 - 14 risk - DOU
4.80 LD today 2018 GV1 12 m  4.80 LD April 9 - 18 Earth closest at 2310 UTC
9.0   LD April 17* 2018 GC2 15 m  9.8 from 10.3 LD today - April 21 EPU +/- 7 mins.*, NHATS target, enters ten LD
9.24 LD tomorrow 2014 UR 16 m  9.25 from 9.33 LD April 10 - 18 NHATS target

This report was generated at 1940 UTC with the discovery of outbound risk-listed 2018 GE2 (MPEC), and with first follow-up for departed 2018 GU1 and outbound risk-listed 2018 GZ in today's DOU MPEC, along with additional observation of 2018 GN1 and continuing follow-up for outbound risk-listed 2018 GG, for approaching objects 2015 DP155 and 1999 FN19, and for distant 450894 2008 BT18.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
6.2   LD May 8* 2016 JQ5 8 m  59.9 from 62.6 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  30.75 from 31.88 LD May 5 - 9 radar/NHATS target - DOU
6.48 LD May 9 388945 2008 TZ3 282 m  54.21 from 56.48 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  155.09 from 159.49 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  75.8 from 77.0 LD June 4 - 16 EPU +/- 15 mins.*, radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  49.99 from 50.65 LD June 6 - 15 NHATS target - DOU
* 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 an object that has approached Earth within ten LD since A/CC began these traffic reports eleven years ago but is not currently 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 13 April '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, 38 were "one nighters." So far The Tracking News has counted a total of 108 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 13 April '18

Minor Planet Electronic Circulars

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


MPEC 2018-G88 - "19:29 UT" - 2018 GN2


MPEC 2018-G87 - "19:26 UT" - 2018 GS2


MPEC 2018-G86 - "19:21 UT" - 2018 GR2


MPEC 2018-G85 - "19:10 UT" - 2018 GQ2


MPEC 2018-G84 - "19:06 UT" - 2018 GP2


MPEC 2018-G83 - "19:01 UT" - 2018 GO2


MPEC 2018-G82 - "18:48 UT" - 2018 GM2


MPEC 2018-G81 - "18:44 UT" - 2018 GH2


MPEC 2018-G80 - "18:40 UT" - 2018 GL2


MPEC 2018-G79 - "18:36 UT" - 2018 GK2


MPEC 2018-G78 - "18:32 UT" - 2018 GJ2


MPEC 2018-G77 - "18:28 UT" - 2018 GG2


MPEC 2018-G76 - "18:23 UT" - 2018 GF2


MPEC 2018-G75 - "18:03 UT" - 2010 GC35


<< DOU on 13 Apr. '18 >>  MPEC 2018-G74 - "12:02 UT" - Daily Orbit Update


MPEC 2018-G73 - "11:21 UT" - 2018 GE2

Observers  on 13 April '18

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-G78 -- 2018 GJ2
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2018-G74 & 2018-G76 -- 2018 GF2, 2018 FH2, 2018 FA3, 2018 ED4, 2018 EA1, 2018 CU1, 2018 BV, 2018 BP5, 2018 BN3, 2017 SO17, 2014 OA2, 2012 QP10, 2011 KW19, 2010 LM14, 2010 DM, 2009 WL1, 2001 TZ1, 154020
T05ATLAS Haleakala in Hawaii, 19 in MPEC 2018-G74 -- 2018 EB, 2015 DP155, 2012 DG61, 53110, 515049, 497117, 475967, 450894, 444193, 40267, 37655, 164201, 153195, 152931, 137062, 11066, 3752, 1866, 1580
T08ATLAS Mauna Loa in Hawaii, 16 in MPECs 2018-G73 & 2018-G74 -- 2018 GE2, 2018 DX3, 2018 BY2, 2009 SK104, 66251, 66008, 53435, 513497, 350462, 337084, 276770, 172034, 163243, 4947, 1627, 1036
703Catalina Sky Survey (CSS) in Arizona, 19 in MPECs 2018-G74, 2018-G77 & 2018-G82 -- 2018 GY1, 2018 GM2, 2018 GG2, 2018 FL3, 2018 EB, 2015 DP155, 2012 DG61, 85953, 513182, 497117, 475967, 37655, 337228, 27346, 164207, 153195, 11066, 6455, 1866
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-G73 -- 2018 GE2
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-G74 -- 2018 GM
K88GINOP-KHK in Hungary, 3 in MPECs 2018-G77, 2018-G78 & 2018-G86 -- 2018 GR2, 2018 GJ2, 2018 GG2
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2018-G77 -- 2018 GG2
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPECs 2018-G74 & 2018-G86 -- 2018 GY1, 2018 GR2
W87LCO Cerro Tololo C in Chile, 1 in MPEC 2018-G74 -- 267940
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2018-G76, 2018-G80, 2018-G84, 2018-G87 & 2018-G88 -- 2018 GS2, 2018 GP2, 2018 GN2, 2018 GL2, 2018 GF2
711McDonald Obs. in Texas, 6 in MPECs 2018-G75, 2018-G77, 2018-G78, 2018-G80, 2018-G85 & 2018-G86 -- 2018 GR2, 2018 GQ2, 2018 GL2, 2018 GJ2, 2018 GG2, 2010 GC35
474Mt. John Obs. in New Zealand, 2 in MPECs 2018-G74 & 2018-G82 -- 2018 GM2, 2011 KE
G96Mt. Lemmon Survey (MLS) in Arizona, 32 in MPECs 2018-G74, 2018-G75, 2018-G76, 2018-G77, 2018-G78, 2018-G79, 2018-G80, 2018-G81, 2018-G83, 2018-G84, 2018-G85, 2018-G86, 2018-G87 & 2018-G88 -- 2018 GU1, 2018 GS2, 2018 GR2, 2018 GQ2, 2018 GP2, 2018 GO2, 2018 GN2, 2018 GL2, 2018 GK2, 2018 GJ2, 2018 GH2, 2018 GG2, 2018 GF2, 2018 FS3, 2018 FQ5, 2017 XH62, 2015 FM34, 2014 FD7, 2013 JN22, 2012 EU14, 2010 GD35, 2010 GC35, 2008 JP14, 53435, 503861, 454100, 444185, 368664, 277810, 12923, 3551, 3102
566NEAT's GEODSS Haleakala telescope in Hawaii, 2 in MPEC 2018-G74 -- 1996 XX14, 7889
644NEAT's Mt. Palomar telescope in southern California, 3 in MPEC 2018-G74 -- 408982, 376848, 310842
608NEAT's USAF Haleakala telescope in Hawaii, 4 in MPEC 2018-G74 -- 86667, 494710, 458452, 138847
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-G73 -- 2018 GE2
F51Pan-STARRS 1 (PS1) in Hawaii, 32 in MPECs 2018-G74, 2018-G83, 2018-G85, 2018-G86 & 2018-G88 -- 2018 GT1, 2018 GR2, 2018 GQ2, 2018 GO2, 2018 GN2, 2018 FW2, 2018 AO18, 2016 GZ215, 2016 CX264, 2015 GZ45, 2015 FP118, 2015 DD155, 2011 HJ7, 2007 KD, 2007 HR, 53435, 507847, 498548, 468813, 440012, 376729, 368664, 350462, 277142, 186822, 164400, 154715, 141531, 141053, 5626, 4179, 3757
F52Pan-STARRS 2 (PS2) in Hawaii, 3 in MPEC 2018-G74 -- 330659, 214869, 136874
L04ROASTERR-1 in Romania, 2 in MPECs 2018-G74 & 2018-G77 -- 2018 GG2, 2018 DX3
204Schiaparelli Obs. in Italy, 8 in MPEC 2018-G74 -- 2018 FY1, 2018 FS3, 2018 FL3, 2018 FF2, 2018 FE4, 2018 FC1, 2018 DH1, 2011 KE
033Schwarzschild Obs. in Germany, 9 in MPECs 2018-G75, 2018-G77, 2018-G78, 2018-G80, 2018-G82, 2018-G83, 2018-G84, 2018-G85 & 2018-G86 -- 2018 GR2, 2018 GQ2, 2018 GP2, 2018 GO2, 2018 GM2, 2018 GL2, 2018 GJ2, 2018 GG2, 2010 GC35
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2018-G74 -- 2018 FJ5
Q11Shinshiro Obs., 1 in MPEC 2018-G74 -- 2018 GJ1
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-G77 -- 2018 GG2
Y00SONEAR in Brazil, 2 in MPEC 2018-G74 -- 68348, 138847
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2018-G74 & 2018-G78 -- 2018 GJ2, 2018 FS3, 1999 FN19, 88188
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2018-G74 & 2018-G87 -- 2018 GS2, 2018 GG
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2018-G74 & 2018-G78 -- 2018 GJ2, 53435
C36Starry Wanderer Obs. in Belarus, 2 in MPEC 2018-G74 -- 2018 EB, 2018 BY2
I52Steward Obs. Mt. Lemmon Station in Arizona, 20 in MPECs 2018-G73, 2018-G74, 2018-G75, 2018-G76, 2018-G77, 2018-G78, 2018-G79, 2018-G80, 2018-G81, 2018-G82, 2018-G83, 2018-G84, 2018-G85, 2018-G86, 2018-G87 & 2018-G88 -- 2018 GZ, 2018 GS2, 2018 GR2, 2018 GQ2, 2018 GP2, 2018 GO2, 2018 GN2, 2018 GN1, 2018 GM2, 2018 GM, 2018 GL2, 2018 GK2, 2018 GK1, 2018 GJ2, 2018 GH2, 2018 GG2, 2018 GF2, 2018 GE2, 2015 HF9, 2010 GC35
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-G74 -- 2018 GG, 2018 FJ5
C51WISE in Earth polar orbit, 2 in MPEC 2018-G74 -- 505657, 40267
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 April '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 GL2JPL Sentry21312049-2117211.57537635e-05-4.27-4.380JPL: Computed at 13:05 today Pacific time based on 39 observations spanning 1.9317 days (2018-Apr-11.23475 to 2018-Apr-13.16645). Diameter approximately 0.050 km. from weighted mean H=24.16.
2018 GG2JPL Sentry19302079-211171.633448e-06-2.77-3.110JPL: Computed at 12:28 today Pacific time based on 45 observations spanning 3.0300 days (2018-Apr-10.39534 to 2018-Apr-13.42537). Diameter approximately 0.490 km. from weighted mean H=19.20.
2018 GE2JPL Sentry15552052-2117926.50276117e-05-5.35-6.160JPL: Computed at 05:48 today Pacific time based on 14 observations spanning 2.9821 days (2018-Apr-10.40973 to 2018-Apr-13.39179). Diameter approximately 0.015 km. from weighted mean H=26.75.
2018 GD2NEODyS15552054-2117252.03e-05-7.22-7.660NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2018-04-11.386 to 2018-04-12.459."
2018 GY1JPL Sentry15552105-211521.270525e-07-5.58-5.590JPL: Computed at 07:37 today Pacific time based on 39 observations spanning 3.0569 days (2018-Apr-10.28963 to 2018-Apr-13.34657). Diameter approximately 0.130 km. from weighted mean H=22.03.
NEODyS15552090-2117125.08e-07-4.92-5.170NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2018-04-10.290 to 2018-04-12.301."
2018 GGJPL Sentry15552086-209541.905352e-06-5.66-5.670JPL: Computed at 07:32 today Pacific time based on 104 observations spanning 5.0465 days (2018-Apr-06.30127 to 2018-Apr-11.347722). Diameter approximately 0.040 km. from weighted mean H=24.64.
2018 FJ5JPL Sentry1555R E M O V E DJPL: Risk listing removed at 1431 UTC today
2018 FE4JPL Sentry15552085-210161.50548e-06-5.64-5.940JPL: Computed at 07:28 today Pacific time based on 31 observations spanning 10.126 days (2018-Mar-20.4591 to 2018-Mar-30.585238). Diameter approximately 0.038 km. from weighted mean H=24.73.

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 13 April '18

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

2131Noted that JPL Sentry has posted 2018 GL2 as an impact risk - see above
2000Grabbed MPEC 2018-G88 - 2018 GN2 - see above
1940Generated Traffic Report
1930Noted that JPL Sentry has posted 2018 GG2 as an impact risk - see above
Grabbed MPEC 2018-G76 - 2018 GF2 - see above
Grabbed MPEC 2018-G77 - 2018 GG2 - see above
Grabbed MPEC 2018-G78 - 2018 GJ2 - see above
Grabbed MPEC 2018-G79 - 2018 GK2 - see above
Grabbed MPEC 2018-G80 - 2018 GL2 - see above
Grabbed MPEC 2018-G81 - 2018 GH2 - see above
Grabbed MPEC 2018-G82 - 2018 GM2 - see above
Grabbed MPEC 2018-G83 - 2018 GO2 - see above
Grabbed MPEC 2018-G84 - 2018 GP2 - see above
Grabbed MPEC 2018-G85 - 2018 GQ2 - see above
Grabbed MPEC 2018-G86 - 2018 GR2 - see above
Grabbed MPEC 2018-G87 - 2018 GS2 - see above
1805Grabbed MPEC 2018-G75 - 2010 GC35 - see above
1555Noted that JPL Sentry has updated its 2018 FE4 risk assessment - see above
Noted that JPL Sentry has removed 2018 FJ5 as an impact risk - see above
Noted that NEODyS has posted 2018 GD2 as an impact risk - see above
Noted that JPL Sentry has posted 2018 GE2 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 GG risk assessment - see above
Noted that JPL Sentry has updated its 2018 GY1 risk assessment - see above
Noted that NEODyS has posted 2018 GY1 as an impact risk - see above
Grabbed MPEC 2018-G73 - 2018 GE2 - see above
Grabbed MPEC 2018-G74 - Daily Orbit Update - see above