Contents  on 10 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 10 April '18

Six objects reported inside ten LD

Six Solar-System small bodies are reported traveling inside ten lunar distances (LD) of our planet today. The nearest of these, 2018 GN, moves out from 2.12 to 6.63 LD, leaving Earth's sphere of gravitational influence far behind.

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 yesterday 2018 GN 19 m  2.12 to 6.63 LD April 7 - 11 exits Earth SOI - DOU
1.39 LD April 3 2018 GZ 10 m  4.82 to 5.47 LD March 19 - April 17 NEW - MPEC
4.06 LD April 3 2018 GE 11 m  4.91 to 5.16 LD March 13 - April 24 NHATS target, risk
4.4   LD April 13* 2018 GP 14 m  6.5 from 8.1 LD April 8 - 18 NEW, EPU +/- 5 mins.* - MPEC
4.68 LD tomorrow 2018 GG 42 m  5.48 from 7.59 LD yesterday - April 14 risk - DOU
9.24 LD April 14 2014 UR 16 m  9.81 from 10.19 LD today - April 18 NHATS target, enters ten LD

This report was generated at 2103 UTC with the discoveries of inbound 2018 GP (MPEC) and outbound 2018 GZ (MPEC), and with first follow-up for inbound risk-listed 2018 GG and departed 2018 FP5 in today's DOU MPEC, along with additional observation of outbound 2018 GN, and continuing follow-up for approaching objects 2015 DP155 and 388945 2008 TZ3, and for distant objects 2007 DB61 and 450894 2008 BT18, plus astrometry from December for 2017 XE.

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  68.0 from 70.8 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  34.15 from 35.28 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  61.09 from 63.43 LD May 5 - 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  168.46 from 173.05 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 184 m  79.5 from 80.8 LD June 4 - 16 EPU +/- 17 mins.*, radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  51.97 from 52.64 LD June 6 - 15 NHATS target - DOU
* EPU = Earth passage uncertainty


<< Reading:  The International Centre for Radio Astronomy Research in Western Australia has a nicely done news item about how, after 1I/`Oumuamua (2017 U1) (links) was discovered, and amid "speculation it could be an alien spacecraft," they went back into data already recorded from the Murchison Widefield Array telescope "to check for radio transmissions coming from the object [as] signs of intelligent life." And a new science preprint analyzes five small impacts on Jupiter observed by amateur observers in the years 2010, 2012, 2016, and 2017.



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 come within ten LD since A/CC began these traffic reports (2007) but is not presently 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 10 April '18

The MPC's NEO Confirmation Page has 40 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 40 objects listed. Of these, 22 were "one nighters." So far The Tracking News has counted a total of 55 listings on the NEOCP today.

New MPECs  on 10 April '18

Minor Planet Electronic Circulars

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


MPEC 2018-G47 - "13:56 UT" - 2018 GZ


MPEC 2018-G46 - "13:52 UT" - 2018 GV


MPEC 2018-G45 - "13:48 UT" - 2018 GY


MPEC 2018-G44 - "13:44 UT" - 2018 GX


MPEC 2018-G43 - "13:40 UT" - 2018 GW


MPEC 2018-G42 - "13:36 UT" - 2018 GU


<< DOU on 10 Apr. '18 >>  MPEC 2018-G41 - "12:02 UT" - Daily Orbit Update


MPEC 2018-G40 - "11:39 UT" - 2015 OS35


MPEC 2018-G39 - "01:54 UT" - 2018 GP


MPEC 2018-G38 - "01:49 UT" - 2018 GQ

Observers  on 10 April '18

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
B37Ametlla del Valles Obs. in Spain, 2 in MPEC 2018-G41 -- 2015 XE352, 2015 RA83
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2018-G41 -- 2018 FV2, 2018 FP4, 2018 FO3, 2017 VH2, 162698, 159609
160Castelmartini Obs. in Italy, 20 in MPEC 2018-G41 -- 2018 FQ5, 2018 EB, 2018 DX3, 2015 XE352, 85953, 85628, 66251, 388945, 363599, 25916, 212359, 194126, 172034, 15745, 14402, 136839, 115052, 9856, 7889, 1627
703Catalina Sky Survey (CSS) in Arizona, 15 in MPEC 2018-G41 -- 2018 GL, 2018 EB, 2015 RL82, 2012 DG61, 85953, 53110, 475967, 450894, 40267, 37655, 265196, 185853, 101873, 1866, 1864
309'Martin Altmann in Germany via Cerro Paranal in Chile, 1 in MPEC 2018-G43 -- 2018 GW
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2018-G40, 2018-G41 & 2018-G43 -- 2018 GW, 2018 FP5, 2018 EX, 2015 OS35
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-G41 -- 85953
K88GINOP-KHK in Hungary, 1 in MPEC 2018-G38 -- 2018 GQ
246KLENOT in the Czech Republic, 6 in MPECs 2018-G38 & 2018-G41 -- 2018 GQ, 2018 GM, 2018 GG, 2018 FQ5, 2018 EB, 2018 DB2
046Klet Obs. in the Czech Republic, 6 in MPEC 2018-G41 -- 2018 DX3, 85628, 66251, 194126, 172034, 9856
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2018-G43, 2018-G44, 2018-G45, 2018-G46 & 2018-G47 -- 2018 GZ, 2018 GY, 2018 GX, 2018 GW, 2018 GV
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2018-G41 -- 15745
G96Mt. Lemmon Survey (MLS) in Arizona, 18 in MPECs 2018-G38, 2018-G39, 2018-G41, 2018-G42, 2018-G44, 2018-G45, 2018-G46 & 2018-G47 -- 2018 GZ, 2018 GY, 2018 GX, 2018 GV, 2018 GU, 2018 GQ, 2018 GP, 2018 EM2, 2018 CE2, 2017 BD29, 2015 XE352, 2015 RA83, 2013 QH10, 2007 DB61, 515639, 451397, 216707, 194126
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2018-G41 -- 2005 JD46, 2005 FN4, 66251
I41Palomar Transient Factory (PTF) in southern California, 3 in MPEC 2018-G41 -- 2015 DP155, 497117, 475967
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2018-G41 -- 162168, 13553
K61Rokycany Obs. in the Czech Republic, 3 in MPECs 2018-G38 & 2018-G41 -- 2018 GQ, 2018 GM, 2018 GG
H36Sandlot Obs. in Kansas, 2 in MPEC 2018-G41 -- 2017 XE, 2017 SO17
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-G41 -- 2018 FY1
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2018-G41 -- 2010 TJ7, 2010 JG88, 2007 DB61
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2018-G39 & 2018-G41 -- 2018 GP, 2018 GG, 2018 FJ5, 2007 HR
I52Steward Obs. Mt. Lemmon Station in Arizona, 21 in MPECs 2018-G39, 2018-G41, 2018-G42, 2018-G44, 2018-G45, 2018-G46 & 2018-G47 -- 2018 GZ, 2018 GY, 2018 GX, 2018 GV, 2018 GU, 2018 GP, 2018 GN, 2018 GM, 2018 GJ, 2018 GH, 2018 GG, 2018 GC, 2018 GA, 2018 FU, 2018 FQ5, 2018 FJ5, 2018 FJ29, 2018 FE5, 2018 FC1, 2018 CK14, 2017 UX5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-G41 -- 2016 CJ195
L01Visnjan Obs., 1 in MPEC 2018-G42 -- 2018 GU
C51WISE in Earth polar orbit, 1 in MPEC 2018-G41 -- 505657
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 GQJPL Sentry04212062-2113111.40961e-08-7.11-7.560JPL: Computed at 20:41 April 9th Pacific time based on 14 observations spanning 1.6388 days (2018-Apr-08.27715 to 2018-Apr-09.91599). Diameter approximately 0.077 km. from weighted mean H=23.21.
2018 GGJPL Sentry16502086-209562.418913e-06-5.50-5.670JPL: Computed at 07:31 today Pacific time based on 95 observations spanning 4.0013 days (2018-Apr-06.30127 to 2018-Apr-10.30256). Diameter approximately 0.042 km. from weighted mean H=24.55.
2018 GCNEODyS1650R E M O V E D-
2018 FJ5JPL Sentry16502084-208419.539e-09-5.25-5.250JPL: Computed at 07:31 today Pacific time based on 75 observations spanning 16.926 days (2018-Mar-24.43016 to 2018-Apr-10.35582). Diameter approximately 0.350 km. from weighted mean H=19.94.

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 10 April '18

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

2103Generated Traffic Report
1650Noted that JPL Sentry has updated its 2018 FJ5 risk assessment - see above
Noted that NEODyS has removed 2018 GC as an impact risk - see above
Noted that JPL Sentry has updated its 2018 GG risk assessment - see above
Grabbed MPEC 2018-G40 - 2015 OS35 - see above
Grabbed MPEC 2018-G41 - Daily Orbit Update - see above
Grabbed MPEC 2018-G42 - 2018 GU - see above
Grabbed MPEC 2018-G43 - 2018 GW - see above
Grabbed MPEC 2018-G44 - 2018 GX - see above
Grabbed MPEC 2018-G45 - 2018 GY - see above
Grabbed MPEC 2018-G46 - 2018 GV - see above
Grabbed MPEC 2018-G47 - 2018 GZ - see above
0421Noted that JPL Sentry has posted 2018 GQ as an impact risk - see above
0420Grabbed MPEC 2018-G38 - 2018 GQ - see above
Grabbed MPEC 2018-G39 - 2018 GP - see above