Contents  on 12 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 12 April '18

Nine objects reported inside ten LD

There are nine minor planets reported less than ten lunar distances (LD) from our home world today. Nearest is newly announced risk-listed intruder 2018 GD2, which started the day at 1.43 LD from Earth and passed us at 0.78 LD at 1641 UTC. It will finish the day still inside the Earth-Moon system, at 0.94 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 today 2018 GD2 4 m  0.78 LD April 6 - 18 NEW, intruder today, Earth closest at 1641 UTC, risk - MPEC
1.39 LD April 3 2018 GZ 10 m  6.11 to 6.76 LD March 19 - April 17 NHATS target, risk
2.00 LD April 9 2018 GN1 11 m  4.61 to 6.45 LD April 4 - 14 NEW - MPEC
3.83 LD April 9 2018 GW1 17 m  7.51 to 10.26 LD April 6 - 12 NEW, exits ten LD - MPEC
4.06 LD April 3 2018 GE 11 m  5.43 to 5.73 LD March 13 - April 24 NHATS target - DOU
4.36 LD tomorrow 2018 GP 13 m  4.45 from 5.23 LD April 8 - 18 DOU
4.68 LD yesterday 2018 GG 42 m  4.69 to 5.78 LD April 9 - 14 risk
4.80 LD tomorrow 2018 GV1 12 m  5.17 from 6.20 LD April 9 - 18 NEW - MPEC
9.24 LD April 14 2014 UR 16 m  9.33 from 9.52 LD April 10 - 18 NHATS target

This report was generated at 2110 UTC with the discoveries of four objects flagged as "NEW" in the active traffic table above, with another in approaching traffic below, and a sixth that has already departed. 2018 GU1 (MPEC) skimmed past our planet at 1.70 LD, and the Moon at 1.03 LD on April 8th. Today's DOU MPEC has first follow-up for inbound 2018 GP and continuing follow-up for approaching 1999 FN19 and outbound 2018 GE.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.0   LD April 17* 2018 GC2 15 m  10.3 from 10.8 LD tomorrow - April 21 NEW, EPU +/- 7 mins.* - MPEC
6.2   LD May 8* 2016 JQ5 8 m  62.6 from 65.3 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  31.88 from 33.01 LD May 5 - 9 radar/NHATS target - DOU
6.48 LD May 9 388945 2008 TZ3 282 m  56.48 from 58.78 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  159.49 from 163.94 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  77.0 from 78.3 LD June 4 - 16 EPU +/- 15 mins.*, radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  50.65 from 51.31 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. 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 12 April '18

The MPC's NEO Confirmation Page has 76 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 76 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 98 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 12 April '18

Minor Planet Electronic Circulars

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


MPEC 2018-G72 - "18:36 UT" - 2018 GD2


MPEC 2018-G71 - "18:32 UT" - 2018 GA2


MPEC 2018-G70 - "18:29 UT" - 2018 GC2


MPEC 2018-G69 - "18:18 UT" - 2018 GB2


MPEC 2018-G68 - "18:14 UT" - 2018 GZ1


MPEC 2018-G67 - "18:10 UT" - 2018 GY1


MPEC 2018-G66 - "18:07 UT" - 2018 GX1


MPEC 2018-G65 - "18:00 UT" - 2018 GW1


MPEC 2018-G64 - "17:56 UT" - 2018 GU1


MPEC 2018-G63 - "17:52 UT" - 2018 GV1


MPEC 2018-G62 - "17:49 UT" - 2018 GT1


MPEC 2018-G61 - "17:45 UT" - 2018 GS1


MPEC 2018-G60 - "17:42 UT" - 2018 GR1


MPEC 2018-G59 - "17:38 UT" - 2018 GQ1


MPEC 2018-G58 - "15:02 UT" - 2014 PH59


<< DOU on 12 Apr. '18 >>  MPEC 2018-G57 - "12:02 UT" - Daily Orbit Update


MPEC 2018-G56 - "10:22 UT" - 2018 GN1

Observers  on 12 April '18

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-G65 -- 2018 GW1
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPECs 2018-G57 & 2018-G71 -- 2018 GA2, 2018 FW3, 2014 DT110, 2010 LM14, 2000 WY28, 510238, 331509, 228587
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2018-G57 -- 152952, 13553
703Catalina Sky Survey (CSS) in Arizona, 41 in MPECs 2018-G57, 2018-G61, 2018-G62, 2018-G63, 2018-G64, 2018-G65 & 2018-G66 -- 2018 GX1, 2018 GW1, 2018 GV1, 2018 GU1, 2018 GT1, 2018 GS1, 2018 FY1, 2018 FB1, 2018 DX3, 2018 BY2, 2012 FN62, 2009 SK104, 2005 FN4, 2003 UR12, 89830, 85490, 66251, 514652, 513497, 503861, 498548, 496962, 36183, 350462, 337084, 333888, 330659, 322763, 31346, 276770, 248926, 204232, 172034, 159533, 154656, 138847, 136618, 12711, 4947, 1627, 1036
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-G58 -- 2014 PH59
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2018-G57 & 2018-G64 -- 2018 GU1, 85953
113Drebach Obs. in Germany, 2 in MPECs 2018-G64 & 2018-G67 -- 2018 GY1, 2018 GU1
K88GINOP-KHK in Hungary, 2 in MPECs 2018-G64 & 2018-G65 -- 2018 GW1, 2018 GU1
238Grorudalen Obs. in Norway, 1 in MPEC 2018-G57 -- 85953
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2018-G64 -- 2018 GU1
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-G57 -- 138847
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPECs 2018-G63 & 2018-G65 -- 2018 GW1, 2018 GV1
K30Luscherz Obs. in Switzerland, 1 in MPEC 2018-G64 -- 2018 GU1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 10 in MPECs 2018-G59, 2018-G60, 2018-G63, 2018-G65, 2018-G66, 2018-G68, 2018-G69, 2018-G70, 2018-G71 & 2018-G72 -- 2018 GZ1, 2018 GX1, 2018 GW1, 2018 GV1, 2018 GR1, 2018 GQ1, 2018 GD2, 2018 GC2, 2018 GB2, 2018 GA2
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-G57 -- 136839
711McDonald Obs. in Texas, 11 in MPECs 2018-G57, 2018-G59, 2018-G60, 2018-G62, 2018-G64, 2018-G67, 2018-G69, 2018-G70 & 2018-G71 -- 2018 GY1, 2018 GU1, 2018 GT1, 2018 GR1, 2018 GQ1, 2018 GC2, 2018 GB2, 2018 GA2, 2018 FJ5, 2018 CB15, 2018 BV
474Mt. John Obs. in New Zealand, 7 in MPECs 2018-G57, 2018-G63 & 2018-G65 -- 2018 GW1, 2018 GV1, 2018 FX1, 2018 FV4, 2018 FM4, 2018 FH5, 2018 ET2
G96Mt. Lemmon Survey (MLS) in Arizona, 34 in MPECs 2018-G56, 2018-G57, 2018-G59, 2018-G60, 2018-G61, 2018-G62, 2018-G65, 2018-G66, 2018-G67, 2018-G68, 2018-G69, 2018-G70, 2018-G71 & 2018-G72 -- 2018 GZ1, 2018 GY1, 2018 GX1, 2018 GW1, 2018 GT1, 2018 GS1, 2018 GR1, 2018 GQ1, 2018 GN1, 2018 GJ1, 2018 GD2, 2018 GC2, 2018 GB2, 2018 GA2, 2018 ER4, 2018 EE, 2016 GZ215, 2004 FJ29, 1999 FN19, 508796, 474574, 439313, 376729, 24761, 162998, 162882, 162854, 15745, 115052, 9856, 8709, 6053, 3271, 2101
K74Muensterschwarzach Obs. in Germany, 2 in MPEC 2018-G57 -- 2018 BY2, 85953
G34Oberfrauendorf Obs. in Germany, 3 in MPECs 2018-G57 & 2018-G64 -- 2018 GU1, 2018 DX3, 2018 BY2
I41Palomar Transient Factory (PTF) in southern California, 5 in MPECs 2018-G56 & 2018-G57 -- 2018 GN1, 2018 CE2, 2013 QH10, 475967, 337228
L18QOS Obs., 1 in MPEC 2018-G57 -- 2018 BY2
033Schwarzschild Obs. in Germany, 13 in MPECs 2018-G59, 2018-G60, 2018-G61, 2018-G62, 2018-G63, 2018-G64, 2018-G65, 2018-G66, 2018-G67, 2018-G68, 2018-G69, 2018-G70 & 2018-G72 -- 2018 GZ1, 2018 GY1, 2018 GX1, 2018 GW1, 2018 GV1, 2018 GU1, 2018 GT1, 2018 GS1, 2018 GR1, 2018 GQ1, 2018 GD2, 2018 GC2, 2018 GB2
Y00SONEAR in Brazil, 1 in MPEC 2018-G57 -- 2018 BY2
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2018-G57 -- 2018 EQ4, 2017 YE5, 2017 RP2, 2016 CX264, 2009 JL1, 1999 FN19, 154656
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2018-G56 & 2018-G57 -- 2018 GN1, 2017 TQ3
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-G57 -- 9856
I52Steward Obs. Mt. Lemmon Station in Arizona, 16 in MPECs 2018-G57, 2018-G59, 2018-G60, 2018-G61, 2018-G62, 2018-G63, 2018-G64, 2018-G65, 2018-G66, 2018-G67, 2018-G68, 2018-G69, 2018-G70 & 2018-G71 -- 2018 GZ1, 2018 GY1, 2018 GX1, 2018 GW1, 2018 GV1, 2018 GU1, 2018 GT1, 2018 GS1, 2018 GR1, 2018 GQ1, 2018 GP, 2018 GC2, 2018 GB2, 2018 GA2, 2018 FY, 2018 FJ29
673!Jana Pittichova Chesley via Table Mtn. Obs. in southern California, 5 in MPECs 2018-G57 & 2018-G67 -- 2018 GY1, 2015 XE352, 505657, 416801, 332446
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-G57 -- 2018 GE, 2017 XH62
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 GD2JPL Sentry20342096-2117158.5834508e-06-7.59-8.230JPL: Computed at 13:05 today Pacific time based on 13 observations spanning 1.0735 days (2018-Apr-11.38514 to 2018-Apr-12.45864). Diameter approximately 0.004 km. from weighted mean H=29.45.
2018 GY1JPL Sentry19302090-211794.716035e-07-4.97-5.090JPL: Computed at 12:28 today Pacific time based on 32 observations spanning 2.0110 days (2018-Apr-10.28963 to 2018-Apr-12.30066). Diameter approximately 0.140 km. from weighted mean H=21.97.
2018 GG1NEODyS15552071-210962.38e-08-6.53-6.720NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2018-04-08.278 to 2018-04-11.208."
2018 GENEODyS1555R E M O V E D-
2018 FJ5JPL Sentry15552084-208414.441e-09-5.58-5.580JPL: Computed at 07:41 today Pacific time based on 78 observations spanning 18.783 days (2018-Mar-24.43016 to 2018-Apr-12.21345). Diameter approximately 0.350 km. from weighted mean H=19.94.
NEODyS1555208411.4e-07-4.06-4.060NEODyS: "Based on 75 optical observations (of which 1 are rejected as outliers) from 2018-03-24.431 to 2018-04-12.214."

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 12 April '18

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

2110Generated Traffic Report
2034Noted that JPL Sentry has posted 2018 GD2 as an impact risk - see above
1930Noted that JPL Sentry has posted 2018 GY1 as an impact risk - see above
1900Grabbed MPEC 2018-G71 - 2018 GA2 - see above
Grabbed MPEC 2018-G72 - 2018 GD2 - see above
1831Grabbed MPEC 2018-G65 - 2018 GW1 - see above
Grabbed MPEC 2018-G66 - 2018 GX1 - see above
Grabbed MPEC 2018-G67 - 2018 GY1 - see above
Grabbed MPEC 2018-G68 - 2018 GZ1 - see above
Grabbed MPEC 2018-G69 - 2018 GB2 - see above
Grabbed MPEC 2018-G70 - 2018 GC2 - see above
1800Grabbed MPEC 2018-G59 - 2018 GQ1 - see above
Grabbed MPEC 2018-G60 - 2018 GR1 - see above
Grabbed MPEC 2018-G61 - 2018 GS1 - see above
Grabbed MPEC 2018-G62 - 2018 GT1 - see above
Grabbed MPEC 2018-G63 - 2018 GV1 - see above
Grabbed MPEC 2018-G64 - 2018 GU1 - see above
1555Noted that JPL Sentry has updated its 2018 FJ5 risk assessment - see above
Noted that NEODyS has updated its 2018 FJ5 risk assessment - see above
Noted that NEODyS has removed 2018 GE as an impact risk - see above
Noted that NEODyS has posted 2018 GG1 as an impact risk - see above
Grabbed MPEC 2018-G56 - 2018 GN1 - see above
Grabbed MPEC 2018-G57 - Daily Orbit Update - see above
Grabbed MPEC 2018-G58 - 2014 PH59 - see above