Contents  on 14 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 14 April '18

Ten objects reported inside ten LD

Bulletin - 2330, updated 2357 UTC:  One new discovery of a close passer has been announced.

Earth passageI D~Size~Inside ten LDNotes
0.50 LD at 0641 UTC tomorrow2018 GE365 m yesterday - April 17intruder - MPEC


Today ten asteroids are known to be within ten lunar distances (LD) of our planet. Nearest of these is risk-listed intruder 2018 GD2, which exits Earth's sphere of gravitational influence as it slides away from 2.38 to 4.04 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
0.78 LD April 12 2018 GD2 4 m  2.38 to 4.04 LD April 6 - 18 intruder, NHATS target, exits Earth SOI, risk
1.39 LD April 3 2018 GZ 10 m  7.41 to 8.07 LD March 19 - April 17 NHATS target, risk
1.41 LD April 10 2018 GE2 15 m  5.61 to 6.94 LD April 2 - 17 risk - DOU
2.00 LD April 9 2018 GN1 11 m  8.36 to 10.30 LD April 4 - 14 exits ten LD
4.06 LD April 3 2018 GE 11 m  6.04 to 6.36 LD March 13 - April 24 NHATS target - DOU
4.36 LD yesterday 2018 GP 13 m  4.49 to 5.31 LD April 8 - 18 DOU
4.68 LD April 11 2018 GG 41 m  8.02 to 10.71 LD April 9 - 14 exits ten LD, risk
4.80 LD yesterday 2018 GV1 12 m  4.80 to 5.23 LD April 9 - 18 DOU
8.97 LD April 17 2018 GC2 15 m  9.38 from 9.76 LD yesterday - April 21 NHATS target - DOU
9.24 LD today 2014 UR 16 m  9.24 LD April 10 - 18 NHATS target, Earth closest at 0640 UTC

This report was generated at 1920 UTC with the recovery of distant 2012 SR56 (MPEC) and with today's DOU MPEC, which has belated discovery announcements for 2018 EA10, which went by at 7.79 LD on March 4th, and risk-listed intruder 2018 FL29, which passed us at 0.58 LD (and the Moon at 0.73 LD) on March 17th. The DOU also has follow-up for five objects in the active traffic table above and two approachers in the table below, as well as for departed objects 2018 GU1, 2018 EF4, and risk-listed intruder 2018 FE3, 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  57.2 from 59.9 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  29.62 from 30.75 LD May 5 - 9 radar/NHATS target - DOU
6.48 LD May 9 388945 2008 TZ3 282 m  51.96 from 54.21 LD May 5 - 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  150.76 from 155.09 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  74.6 from 75.8 LD June 4 - 16 EPU +/- 15 mins.*, radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  49.33 from 49.99 LD June 6 - 15 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 come within ten LD since A/CC began these traffic reports (2007) but are not so close now. 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 14 April '18

The MPC's NEO Confirmation Page has 78 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 78 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 95 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 14 April '18

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 2018-G94 - "23:20 UT" - 2018 GE3


MPEC 2018-G93 - "23:12 UT" - 2018 GD3


MPEC 2018-G92 - "20:57 UT" - Comet C/2018 E2 (Barros)


<< DOU on 14 Apr. '18 >>  MPEC 2018-G91 - "12:02 UT" - Daily Orbit Update


MPEC 2018-G90 - "11:15 UT" - 2012 SR56


MPEC 2018-G89 - "00:33 UT" - 2014 WG7

Observers  on 14 April '18

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2018-G91 -- 2018 FQ5, 2005 JD46, 85628, 513497, 36183, 276770, 4947, 1036
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2018-G91 -- 2004 FJ29, 53435, 505667, 474574, 388945, 38091, 194126, 9856
703Catalina Sky Survey (CSS) in Arizona, 24 in MPECs 2018-G91 & 2018-G94 -- 2018 GE3, 2018 GE2, 2018 FQ5, 2018 EE, 2018 DB2, 2017 WH14, 2017 BD29, 2014 FD7, 2013 QH10, 1999 FN19, 511808, 505667, 474574, 450894, 439313, 411201, 38091, 24761, 194126, 15745, 9856, 8037, 7977, 3122
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2018-G93 -- 2018 GD3
151Eschenberg Obs. in Switzerland, 1 in MPEC 2018-G91 -- 2018 BY2
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-G94 -- 2018 GE3
K88GINOP-KHK in Hungary, 1 in MPEC 2018-G94 -- 2018 GE3
J95Great Shefford Obs. in England, 1 in MPEC 2018-G94 -- 2018 GE3
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-G91 -- 212359
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-G94 -- 2018 GE3
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-G94 -- 2018 GE3
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2018-G92 & 2018-G94 -- 2018 GE3, C/2018 E2
246KLENOT in the Czech Republic, 2 in MPECs 2018-G91 & 2018-G94 -- 2018 GE3, 2018 BY2
T04LCO Haleakala OGG B#2 in Hawaii, 1 in MPEC 2018-G91 -- 1999 FN19
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPEC 2018-G91 -- 2018 FM29, 2018 EA10
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-G91 -- 2018 EF4
474Mt. John Obs. in New Zealand, 9 in MPECs 2018-G91 & 2018-G92 -- 2018 GV1, 2018 GP, 2018 FP3, 2018 FO5, 2018 FJ4, 2018 FF2, C/2018 E2, 2015 FE37, 2015 DD155
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2018-G90, 2018-G91 & 2018-G93 -- 2018 GK2, 2018 GH2, 2018 GD3, 2018 FM29, 2018 FL29, 2018 EA10, 2017 BD29, 2014 JC31, 2012 SR56, 2004 EU22, 497117, 265196
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-G94 -- 2018 GE3
F51Pan-STARRS 1 (PS1) in Hawaii, 32 in MPECs 2018-G89, 2018-G90, 2018-G91 & 2018-G93 -- 2018 GM2, 2018 GD3, 2018 GC2, 2018 FP3, 2018 FD3, 2018 EZ9, 2016 HJ19, 2015 TQ178, 2015 RG36, 2014 WG7, 2013 AV60, 2012 SR56, 2012 HO1, 2012 HM1, 2008 HO3, 2005 HM3, 2002 ON4, 85490, 411611, 363790, 357311, 337084, 330659, 25916, 242147, 214869, 152770, 136618, 12923, 100004, 7753, 4581
033Schwarzschild Obs. in Germany, 1 in MPEC 2018-G93 -- 2018 GD3
Y00SONEAR in Brazil, 1 in MPEC 2018-G91 -- 1685
587Sormano Obs. in Italy, 1 in MPEC 2018-G94 -- 2018 GE3
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2018-G91 -- 2018 FS3, 2017 RP2, 2016 CX264
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2018-G91 -- 2018 GV, 2018 EZ9, 2018 EZ3, 2010 GD35
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-G91 -- 2018 FS3
I52Steward Obs. Mt. Lemmon Station in Arizona, 17 in MPECs 2018-G90, 2018-G91, 2018-G93 & 2018-G94 -- 2018 GX1, 2018 GU1, 2018 GT1, 2018 GS1, 2018 GQ1, 2018 GM, 2018 GL1, 2018 GJ1, 2018 GJ, 2018 GE3, 2018 GE, 2018 GD3, 2018 GC2, 2018 FS3, 2018 EY3, 2017 GT5, 2012 SR56
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2018-G91 -- 2018 GQ, 2018 FJ5, 2018 FE3, 2018 EL4
C51WISE in Earth polar orbit, 2 in MPEC 2018-G91 -- 2012 DG61, 40267
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 GN2NEODyS1600206711.79e-10-10.95-10.950NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2018-04-11.283 to 2018-04-13.362."
2018 GL2NEODyS16002049-2108152.84e-06-5.12-5.390NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2018-04-11.236 to 2018-04-13.167."
2018 GG2NEODyS16002079-211181.75e-06-2.76-3.080NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2018-04-10.396 to 2018-04-13.426."
2018 GE2JPL Sentry16002052-2117857.00330932e-05-5.32-6.130JPL: Computed at 07:49 today Pacific time based on 18 observations spanning 3.9761 days (2018-Apr-10.40973 to 2018-Apr-14.38582). Diameter approximately 0.015 km. from weighted mean H=26.74.
NEODyS16002052-21182655.86e-05-5.35-6.17n/aNEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2018-04-10.411 to 2018-04-13.393."
2018 GY1NEODyS16002090-211531.5e-07-5.51-5.520NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2018-04-10.290 to 2018-04-13.347."
2018 GQJPL Sentry16002109-210914.073e-10-8.95-8.950JPL: Computed at 07:43 today Pacific time based on 22 observations spanning 5.0268 days (2018-Apr-08.27715 to 2018-Apr-13.303981). Diameter approximately 0.070 km. from weighted mean H=23.42.
2018 GGNEODyS16002086-209561.97e-06-5.64-5.670NEODyS: "Based on 105 optical observations (of which 4 are rejected as outliers) from 2018-04-06.302 to 2018-04-11.349."
2018 FL29JPL Sentry16002026-21162668.50503858000001e-05-6.33-6.720JPL: Computed at 07:25 today Pacific time based on 10 observations spanning .86860 days (2018-Mar-19.43246 to 2018-Mar-20.30106). Diameter approximately 0.003 km. from weighted mean H=30.07.
2018 FJ5NEODyS1600208415.51e-09-5.48-5.480NEODyS: "Based on 79 optical observations (of which 1 are rejected as outliers) from 2018-03-24.431 to 2018-04-12.214."
2018 FE4NEODyS16002079-2118151.17e-06-5.83-6.48n/aNEODyS: "Based on 26 optical observations (of which 1 are rejected as outliers) from 2018-03-20.460 to 2018-03-27.382."
2018 FE3JPL Sentry16002090-211821.083618e-05-6.49-6.490JPL: Computed at 07:17 today Pacific time based on 58 observations spanning 23.044 days (2018-Mar-21.27141 to 2018-Apr-13.315681). Diameter approximately 0.012 km. from weighted mean H=27.19.
2018 EL4JPL Sentry16002110-211021.0162e-07-7.57-7.840JPL: Computed at 07:13 today Pacific time based on 81 observations spanning 30.072 days (2018-Mar-14.20994 to 2018-Apr-13.281742). Diameter approximately 0.030 km. from weighted mean H=25.28.

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 14 April '18

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

2326Grabbed MPEC 2018-G93 - 2018 GD3 - see above
Grabbed MPEC 2018-G94 - 2018 GE3 - see above
2104Grabbed MPEC 2018-G92 - Comet C/2018 E2 (Barros) - see above
1920Generated Traffic Report
1600Noted that JPL Sentry has updated its 2018 EL4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 FE3 risk assessment - see above
Noted that NEODyS has updated its 2018 FE4 risk assessment - see above
Noted that NEODyS has updated its 2018 FJ5 risk assessment - see above
Noted that JPL Sentry has posted 2018 FL29 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 GE2 risk assessment - see above
Noted that NEODyS has posted 2018 GE2 as an impact risk - see above
Noted that NEODyS has updated its 2018 GG risk assessment - see above
Noted that NEODyS has posted 2018 GG2 as an impact risk - see above
Noted that NEODyS has posted 2018 GL2 as an impact risk - see above
Noted that NEODyS has posted 2018 GN2 as an impact risk - see above
Noted that JPL Sentry has reposted 2018 GQ as an impact risk - see above
Noted that NEODyS has updated its 2018 GY1 risk assessment - see above
Grabbed MPEC 2018-G90 - 2012 SR56 - see above
Grabbed MPEC 2018-G91 - Daily Orbit Update - see above
0048Grabbed MPEC 2018-G89 - 2014 WG7 - see above