Contents  on 11 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 11 April '18

Six objects reported inside ten LD

Six transient natural objects are known to be within ten lunar distances (LD) of Earth today. Nearest is risk-listed 2018 GG, which gets its closest to our planet on this passage, coming to 4.68 LD at 2157 UTC.

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
1.12 LD April 9 2018 GN 19 m  6.63 to 11.34 LD April 7 - 11 exits ten LD, risk - DOU
1.39 LD April 3 2018 GZ 10 m  5.47 to 6.11 LD March 19 - April 17 NHATS target, risk
4.06 LD April 3 2018 GE 11 m  5.16 to 5.43 LD March 13 - April 24 NHATS target, risk
4.4   LD April 13* 2018 GP 14 m  5.2 from 6.5 LD April 8 - 18 EPU +/- 5 mins.*
4.68 LD today 2018 GG 42 m  4.68 LD April 9 - 14 Earth closest at 2157 UTC, risk
9.24 LD April 14 2014 UR 16 m  9.52 from 9.81 LD yesterday - April 18 NHATS target

This report was generated at 1910 UTC with follow-up in today's DOU MPEC for approaching 2018 EJ4 along with astrometry for outbound risk-listed 2018 GN.

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  65.3 from 68.0 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  33.01 from 34.15 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  58.78 from 61.09 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  163.94 from 168.46 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  78.3 from 79.5 LD June 4 - 16 EPU +/- 15 mins.*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  51.31 from 51.97 LD June 6 - 15 NHATS target
* EPU = Earth passage uncertainty


<< Reading:  The Western Australian science publication Particle has an article about studying material brought back from 25143 Itokawa (1998 SF36) by the Japanese Hayabusa mission, and to be brought back from 162173 Ryugu (1999 JU3) by the Hayabusa2 mission now in progress. And NASA/Goddard has a news item celebrating citizen scientists working in a variety of specialties around the world, such as providing reference imagery for Jupiter and spotting impacts on the giant planet.



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 11 April '18

The MPC's NEO Confirmation Page has 61 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 61 objects listed. Of these, 39 were "one nighters." So far The Tracking News has counted a total of 77 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 11 April '18

Minor Planet Electronic Circulars

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


MPEC 2018-G55 - "16:03 UT" - 2018 GM1


MPEC 2018-G54 - "16:00 UT" - 2018 GL1


MPEC 2018-G53 - "15:57 UT" - 2018 GK1


MPEC 2018-G52 - "15:54 UT" - 2018 GJ1


MPEC 2018-G51 - "15:51 UT" - 2018 GH1


MPEC 2018-G50 - "15:47 UT" - 2018 GG1


MPEC 2018-G49 - "13:31 UT" - 2001 VJ5


<< DOU on 11 Apr. '18 >>  MPEC 2018-G48 - "12:01 UT" - Daily Orbit Update

Observers  on 11 April '18

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
L33Ananjev Obs. in Ukraine, 1 in MPEC 2018-G52 -- 2018 GJ1
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-G52 -- 2018 GJ1
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2018-G51 -- 2018 GH1
B88Bigmuskie Obs. in Italy, 1 in MPEC 2018-G48 -- 2018 EE
703Catalina Sky Survey (CSS) in Arizona, 24 in MPECs 2018-G48 & 2018-G52 -- 2018 GJ1, 2018 FQ5, 2018 EE, 2018 DB2, 2018 CE2, 2017 XH62, 2017 BD29, 2015 XE352, 2015 RA83, 2013 QH10, 53435, 515446, 511808, 474574, 368664, 36284, 358744, 194126, 162998, 15745, 155341, 9856, 8709, 3122
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-G48 -- 2018 GN
113Drebach Obs. in Germany, 1 in MPEC 2018-G52 -- 2018 GJ1
K88GINOP-KHK in Hungary, 1 in MPEC 2018-G52 -- 2018 GJ1
A17Guidestar Obs. in Germany, 1 in MPEC 2018-G52 -- 2018 GJ1
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2018-G52 -- 2018 GJ1
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-G48 -- 2018 FN4
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2018-G52 -- 2018 GJ1
585Kiev Comet Station in Ukraine, 1 in MPEC 2018-G52 -- 2018 GJ1
246KLENOT in the Czech Republic, 1 in MPEC 2018-G52 -- 2018 GJ1
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-G49, 2018-G50 & 2018-G51 -- 2018 GH1, 2018 GG1, 2001 VJ5
C41MASTER-II Kislovodsk in Russia, 2 in MPEC 2018-G48 -- 374851, 212359
711McDonald Obs. in Texas, 3 in MPECs 2018-G50, 2018-G51 & 2018-G55 -- 2018 GM1, 2018 GH1, 2018 GG1
G96Mt. Lemmon Survey (MLS) in Arizona, 29 in MPECs 2018-G48, 2018-G49, 2018-G50, 2018-G51, 2018-G53, 2018-G54 & 2018-G55 -- 2018 GM1, 2018 GL1, 2018 GK1, 2018 GH1, 2018 GG1, 2018 FS1, 2018 FE2, 2018 EW3, 2018 EE4, 2018 DB2, 2007 EM, 2001 VJ5, 54686, 515446, 511808, 505667, 505093, 497113, 456898, 368949, 365246, 363024, 35432, 276392, 162011, 155341, 154652, 152637, 4257
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-G52 -- 2018 GJ1
I41Palomar Transient Factory in southern California, 1 in MPEC 2018-G48 -- 265196
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2018-G48 -- 2018 EE, 2018 DX3, 2018 DB2, 2018 BY2
L04ROASTERR-1 in Romania, 1 in MPEC 2018-G48 -- 2018 BY2
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-G52 -- 2018 GJ1
033Schwarzschild Obs. in Germany, 3 in MPECs 2018-G52, 2018-G53 & 2018-G54 -- 2018 GL1, 2018 GK1, 2018 GJ1
Y00SONEAR in Brazil, 1 in MPEC 2018-G48 -- 138847
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2018-G48, 2018-G49 & 2018-G55 -- 2018 GM1, 2018 FS3, 2017 TV4, 2012 KY41, 2010 JG88, 2001 VJ5
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2018-G48 -- 2018 FJ4, 2013 EM20, 2012 DJ61, 2009 UP5, 2009 AH16, 2008 AZ30
I52Steward Obs. Mt. Lemmon Station in Arizona, 11 in MPECs 2018-G48, 2018-G49, 2018-G50, 2018-G51, 2018-G52, 2018-G53, 2018-G54 & 2018-G55 -- 2018 GQ, 2018 GM1, 2018 GL1, 2018 GL, 2018 GK1, 2018 GJ1, 2018 GH1, 2018 GG1, 2018 EJ4, 2018 EB, 2001 VJ5
673!Jana Pittichova Chesley via Table Mtn. Obs. in southern California, 2 in MPECs 2018-G52 & 2018-G54 -- 2018 GL1, 2018 GJ1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-G48 -- 2018 GQ
E08Wobblesock Obs. in New South Wales, 1 in MPEC 2018-G52 -- 2018 GJ1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 GG1JPL Sentry18502105-210513.522e-08-6.34-6.340JPL: Computed at 10:26 today Pacific time based on 18 observations spanning 2.9300 days (2018-Apr-08.27715 to 2018-Apr-11.20714). Diameter approximately 0.110 km. from weighted mean H=22.45.
2018 GZNEODyS1530211422.09e-09-10.50-10.780NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2018-04-08.317 to 2018-04-10.262."
2018 GVNEODyS15302029-2105111.16e-08-5.35-5.640NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2018-04-07.147 to 2018-04-10.213."
2018 GQJPL Sentry1500R E M O V E DJPL: Risk listing removed at 1441 UTC today
NEODyS1530207711.38e-07-6.21-6.210NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2018-04-08.278 to 2018-04-11.341."
2018 GNNEODyS1530210913.12e-08-8.08-8.080NEODyS: "Based on 81 optical observations (of which 0 are rejected as outliers) from 2018-04-08.337 to 2018-04-09.296."
2018 GGNEODyS15302086-209571.06e-06-5.87-5.930NEODyS: "Based on 96 optical observations (of which 4 are rejected as outliers) from 2018-04-06.302 to 2018-04-10.303."
2018 FJ5NEODyS1530208413.19e-07-3.70-3.70NEODyS: "Based on 72 optical observations (of which 1 are rejected as outliers) from 2018-03-24.431 to 2018-04-10.357."
2016 AZ193JPL Sentry15002018-21145012.2029633e-06-6.27-7.220JPL: Computed at 14:28 April 6th of 2017 Pacific time based on 9 observations spanning .15930 days (2016-Jan-03.25638 to 2016-Jan-03.41568). Diameter approximately 0.016 km. from weighted mean H=26.62.

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 11 April '18

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

1910Generated Traffic Report
1850Noted that JPL Sentry has posted 2018 GG1 as an impact risk - see above
Grabbed MPEC 2018-G51 - 2018 GH1 - see above
Grabbed MPEC 2018-G52 - 2018 GJ1 - see above
Grabbed MPEC 2018-G53 - 2018 GK1 - see above
Grabbed MPEC 2018-G54 - 2018 GL1 - see above
Grabbed MPEC 2018-G55 - 2018 GM1 - see above
1549Grabbed MPEC 2018-G50 - 2018 GG1 - see above
1530Noted that NEODyS has updated its 2018 FJ5 risk assessment - see above
Noted that NEODyS has updated its 2018 GG risk assessment - see above
Noted that NEODyS has posted 2018 GN as an impact risk - see above
Noted that NEODyS has posted 2018 GQ as an impact risk - see above
Noted that NEODyS has posted 2018 GV as an impact risk - see above
Noted that NEODyS has posted 2018 GZ as an impact risk - see above
1500Noted that JPL Sentry has updated its 2016 AZ193 risk assessment - see above
Noted that JPL Sentry has removed 2018 GQ as an impact risk - see above
Grabbed MPEC 2018-G48 - Daily Orbit Update - see above
Grabbed MPEC 2018-G49 - 2001 VJ5 - see above