Contents  on 16 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 16 April '18

Eleven objects reported inside ten LD

There are eleven minor planets known to be within ten lunar distances (LD) of our home world today, none particularly close. Newly announced 2018 GD5 is the nearest, outbound from 4.41 to 5.30 LD, while intruder 2018 GE3 speeds away from 4.82 to 11.44 LD, leaving our ten-LD traffic reporting sphere.

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
0.50 LD yesterday 2018 GE3 60 m  4.82 to 11.44 LD April 13 - 16 intruder, exits ten LD - DOU
0.78 LD April 12 2018 GD2 4 m  5.74 to 7.44 LD April 6 - 18 intruder, NHATS target, risk
1.39 LD April 3 2018 GZ 10 m  8.72 to 9.38 LD March 19 - tomorrow NHATS target, risk - DOU
1.41 LD April 10 2018 GE2 14 m  8.29 to 9.66 LD April 2 - 17 NHATS target, risk - DOU
3.62 LD April 14 2018 GD5 9 m  4.41 to 5.30 LD April 7 - 21 NEW - MPEC
4.06 LD April 3 2018 GE 11 m  6.71 to 7.05 LD March 13 - April 24 NHATS target, risk
4.36 LD April 13 2018 GP 13 m  6.64 to 8.23 LD April 8 - 18
4.80 LD April 13 2018 GV1 12 m  6.29 to 7.72 LD April 9 - 18
5.87 LD tomorrow 2018 GK4 20 m  6.12 from 7.19 LD April 14 - 21
8.97 LD tomorrow 2018 GC2 15 m  8.98 from 9.11 LD April 13 - 21 NHATS target - DOU
9.24 LD April 14 2014 UR 16 m  9.40 to 9.64 LD April 10 - 18 NHATS target

This report was generated at 2018 UTC with the discovery of outbound 2018 GD5 (MPEC) and with follow-up in today's DOU MPEC for inbound 2018 GC2, for outbound objects intruder 2018 GE3, and, both risk listed, 2018 GE2 and 2018 GZ. The DOU also has follow-up for approaching 388945 2008 TZ3 and for distant objects 2003 FY6 and 450894 2008 BT18, plus astrometry from February-March for radar targets 2018 DH1 and 2017 VR12.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
8.51 LD April 20 2018 GS3 21 m  18.02 from 22.07 LD April 19 - 21
9.7   LD April 23* 2018 GG4 18 m  24.6 from 27.8 LD April 23 - 24 EPU +/- 5 mins.*, risk
6.2   LD May 8* 2016 JQ5 8 m  52.0 from 54.6 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  27.38 from 28.50 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  47.52 from 49.73 LD May 5 - 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  142.29 from 146.49 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  72.1 from 73.3 LD June 4 - 16 EPU +/- 10 mins.*, radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  48.01 from 48.67 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 16 April '18

The MPC's NEO Confirmation Page has 53 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 53 objects listed. Of these, 30 were "one nighters." So far The Tracking News has counted a total of 70 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 16 April '18

Minor Planet Electronic Circulars

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


MPEC 2018-H14 - "23:51 UT" - 2014 CH14


MPEC 2018-H13 - "23:49 UT" - 2008 OX8


MPEC 2018-H12 - "16:58 UT" - 2018 GD5


MPEC 2018-H11 - "16:54 UT" - 2018 GE5


MPEC 2018-H10 - "16:51 UT" - 2018 GC5


MPEC 2018-H09 - "16:47 UT" - 2018 GB5


MPEC 2018-H08 - "16:43 UT" - 2018 GA5


MPEC 2018-H07 - "16:39 UT" - 2018 GZ4


MPEC 2018-H06 - "16:36 UT" - 2018 GY4


MPEC 2018-H05 - "16:32 UT" - 2018 GX4


MPEC 2018-H04 - "16:28 UT" - 2018 GW4


MPEC 2018-H03 - "13:43 UT" - 2012 HP15


<< DOU on 16 Apr. '18 >>  MPEC 2018-H02 - "12:03 UT" - Daily Orbit Update


MPEC 2018-H01 - "11:40 UT" - 2015 KX121

Observers  on 16 April '18

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 1 in MPEC 2018-H02 -- 3752
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2018-H02 & 2018-H04 -- 2018 GW4, 2017 XJ62
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2018-H02 -- 436116, 162168, 5604, 1685
073Bucharest Obs. in Romania, 1 in MPEC 2018-H02 -- 2018 GE3
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2018-H02 -- 2018 GO4
703Catalina Sky Survey (CSS) in Arizona, 17 in MPEC 2018-H02 -- 2018 GL, 2018 GH, 2017 WH14, 2017 BD29, 2015 RL82, 85953, 505657, 450894, 444193, 37655, 337228, 152964, 152931, 144332, 11066, 6455, 1866
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2018-H01, 2018-H02, 2018-H03, 2018-H05, 2018-H06, 2018-H07, 2018-H13 & 2018-H14 -- 2018 GZ4, 2018 GY4, 2018 GX4, 2018 GJ4, 2018 GH4, 2018 AL18, 2015 KX121, 2014 CH14, 2013 LE7, 2012 HP15, 2008 OX8
B50Corner Obs. in Germany, 1 in MPEC 2018-H02 -- 2018 DH1
K88GINOP-KHK in Hungary, 1 in MPEC 2018-H08 -- 2018 GA5
J95Great Shefford Obs. in England, 3 in MPECs 2018-H02, 2018-H09 & 2018-H12 -- 2018 GE3, 2018 GD5, 2018 GB5
246KLENOT in the Czech Republic, 1 in MPEC 2018-H02 -- 2018 GE2
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-H03, 2018-H04 & 2018-H10 -- 2018 GW4, 2018 GC5, 2012 HP15
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2018-H02 -- 162998
C41MASTER-II Kislovodsk in Russia, 1 in MPEC 2018-H02 -- 25916
711McDonald Obs. in Texas, 2 in MPECs 2018-H04 & 2018-H07 -- 2018 GZ4, 2018 GW4
G96Mt. Lemmon Survey (MLS) in Arizona, 32 in MPECs 2018-H02, 2018-H03, 2018-H04, 2018-H05, 2018-H07, 2018-H08, 2018-H09, 2018-H10, 2018-H11 & 2018-H12 -- 2018 GZ4, 2018 GX4, 2018 GW4, 2018 GN1, 2018 GM2, 2018 GH2, 2018 GE5, 2018 GD5, 2018 GC5, 2018 GC2, 2018 GB5, 2018 GA5, 2018 FY4, 2017 UA1, 2016 HJ19, 2015 KX121, 2012 HP15, 2012 HO1, 2011 KE, 2008 GB110, 2005 JD46, 66251, 435302, 350713, 345853, 337084, 214869, 172034, 159533, 152941, 152679, 136874
566NEAT's GEODSS Haleakala telescope in Hawaii, 2 in MPEC 2018-H02 -- 10563, 10115
608NEAT's USAF Haleakala telescope in Hawaii, 3 in MPEC 2018-H02 -- 108906, 106538, 101869
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-H02 -- 2018 GE3
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2018-H02 -- 388945
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2018-H02 -- 172034
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2018-H02, 2018-H05, 2018-H06 & 2018-H07 -- 2018 GZ4, 2018 GY4, 2018 GX4, 2003 OT13
D29Purple Mtn. Obs. Xuyi Station in China, 12 in MPEC 2018-H02 -- 2018 FN4, 2018 DX3, 2016 CX264, 2005 OX, 2003 FY6, 89830, 88254, 65674, 333888, 172034, 162038, 1627
W71Rand II Obs. in New York, 1 in MPEC 2018-H02 -- 2017 RX1
247roving observer, 1 in MPEC 2018-H02 -- 2017 VR12
C95SATINO-1 in France, 1 in MPEC 2018-H08 -- 2018 GA5
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-H02 -- 2018 EB
033Schwarzschild Obs. in Germany, 2 in MPECs 2018-H08 & 2018-H09 -- 2018 GB5, 2018 GA5
Y28Sertao de Itaparica Obs. in Brazil, 1 in MPEC 2018-H02 -- 2018 FJ5
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-H02 -- 2018 GE2
691Spacewatch 0.9m telescope in Arizona, 17 in MPECs 2018-H02, 2018-H06 & 2018-H07 -- 2018 GZ4, 2018 GY4, 2018 GY1, 2018 GT3, 2018 GG2, 2018 GF4, 2018 GE2, 2018 FV, 2018 FS3, 2018 FS1, 2018 EM2, 2018 EE, 2018 DK3, 2017 RP2, 2013 JN22, 488490, 440012
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2018-H02, 2018-H04 & 2018-H07 -- 2018 GZ4, 2018 GZ, 2018 GY, 2018 GW4, 2018 GW3, 2018 GV, 2018 GN2, 2018 GL2, 2013 WR43, 2013 TR132, 2013 AA53, 2011 ME
I52Steward Obs. Mt. Lemmon Station in Arizona, 19 in MPECs 2018-H02, 2018-H04, 2018-H05, 2018-H06, 2018-H07, 2018-H08, 2018-H09, 2018-H10, 2018-H11 & 2018-H12 -- 2018 GZ4, 2018 GY4, 2018 GX4, 2018 GW4, 2018 GR2, 2018 GQ2, 2018 GN1, 2018 GM, 2018 GJ1, 2018 GG2, 2018 GE5, 2018 GE2, 2018 GD5, 2018 GC5, 2018 GC2, 2018 GB5, 2018 GB2, 2018 GA5, 2018 EB
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-H02 -- 2018 FU1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 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 GA5JPL Sentry18082063-2110141.12838e-08-4.71-5.520JPL: Computed at 10:58 today Pacific time based on 25 observations spanning 2.8734 days (2018-Apr-13.46779 to 2018-Apr-16.3412). Diameter approximately 0.734 km. from weighted mean H=18.32.
2018 GY3JPL Sentry1630R E M O V E DJPL: Risk listing removed at 1916 UTC April 15th
2018 GL2JPL Sentry15402050-209357.36459e-06-4.80-4.850JPL: Computed at 07:31 today Pacific time based on 45 observations spanning 4.9100 days (2018-Apr-11.23475 to 2018-Apr-16.14477). Diameter approximately 0.049 km. from weighted mean H=24.19.
2018 GG2JPL Sentry15402109-211152.4058025e-06-2.66-2.700JPL: Computed at 07:28 today Pacific time based on 55 observations spanning 5.8724 days (2018-Apr-10.39534 to 2018-Apr-16.26775). Diameter approximately 0.480 km. from weighted mean H=19.25.
2018 GE2JPL Sentry15402057-21171010.000107305018-5.19-5.980JPL: Computed at 07:46 today Pacific time based on 42 observations spanning 5.9160 days (2018-Apr-10.40973 to 2018-Apr-16.32576). Diameter approximately 0.014 km. from weighted mean H=26.87.
NEODyS15402054-21182631.1e-04-5.15-5.97-NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2018-04-10.411 to 2018-04-15.468."
2018 GY1JPL Sentry1540R E M O V E DJPL: Risk listing removed at 1410 UTC today
2018 GENEODyS1540209311.07e-09-10.59-10.590NEODyS: "Based on 40 optical observations (of which 1 are rejected as outliers) from 2018-04-05.426 to 2018-04-14.315."
2018 FU1JPL Sentry16302090-211764.2208423e-06-6.67-6.730JPL #2 for the day: Computed at 09:09 today Pacific time based on 23 observations spanning 26.157 days (2018-Mar-18.47342 to 2018-Apr-13.630872). Diameter approximately 0.014 km. from weighted mean H=26.86.

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 16 April '18

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

2358Grabbed MPEC 2018-H13 - 2008 OX8 - see above
Grabbed MPEC 2018-H14 - 2014 CH14 - see above
2018Generated Traffic Report
1808Noted that JPL Sentry has posted 2018 GA5 as an impact risk - see above
1740Grabbed MPEC 2018-H05 - 2018 GX4 - see above
Grabbed MPEC 2018-H06 - 2018 GY4 - see above
Grabbed MPEC 2018-H07 - 2018 GZ4 - see above
Grabbed MPEC 2018-H08 - 2018 GA5 - see above
Grabbed MPEC 2018-H09 - 2018 GB5 - see above
Grabbed MPEC 2018-H10 - 2018 GC5 - see above
Grabbed MPEC 2018-H11 - 2018 GE5 - see above
Grabbed MPEC 2018-H12 - 2018 GD5 - see above
1630Noted that JPL Sentry has updated its 2018 FU1 risk assessment - see above
Noted that JPL Sentry has removed 2018 GY3 as an impact risk - see above
Grabbed MPEC 2018-H04 - 2018 GW4 - see above
1540Noted that JPL Sentry has updated its 2018 FU1 risk assessment - see above
Noted that NEODyS has reposted 2018 GE as an impact risk - see above
Noted that JPL Sentry has updated its 2018 GE2 risk assessment - see above
Noted that NEODyS has updated its 2018 GE2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 GG2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 GL2 risk assessment - see above
Noted that JPL Sentry has removed 2018 GY1 as an impact risk - see above
Grabbed MPEC 2018-H01 - 2015 KX121 - see above
Grabbed MPEC 2018-H02 - Daily Orbit Update - see above
Grabbed MPEC 2018-H03 - 2012 HP15 - see above