Contents  on 6 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 6 April '18

Two objects reported inside ten LD

There are two minor objects reported to be less than ten lunar distances (LD) from Earth today. Newly announced 2018 GE is outbound from about 4.2 to 4.3 LD* and 2018 EM4 exits our ten-LD traffic reporting "bubble," passing from 9.11 to 10.18 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
4.1   LD April 3* 2018 GE 12 m  4.2 to 4.3 LD March 13 - April 24 NEW, EPU +/- 15 mins.* - MPEC
6.23 LD April 1 2018 EM4 30 m  9.11 to 10.18 LD March 26 - today NHATS target, exits ten LD
* EPU = Earth passage uncertainty

This report was generated at 1826 UTC with the discovery of outbound 2018 GE (MPEC) and with follow-up in today's DOU MPEC for approaching objects 2018 EJ4, 2015 DP155, and 388945 2008 TZ3, departed objects 2018 FW4 and 2018 FM3, and distant objects 450894 2008 BT18 and risk-listed 2016 SR2.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.24 LD April 14 2014 UR 16 m  11.75 from 12.39 LD April 10 - 18 NHATS target
6.2   LD May 8* 2016 JQ5 8 m  79.3 from 82.3 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  38.70 from 39.84 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  70.57 from 73.00 LD May 5 - 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  187.20 from 192.04 LD May 28 - 30 radar target
5.5   LD June 10* 2018 EJ4 182 m  84.6 from 85.9 LD June 4 - 16 EPU +/- 26 mins.*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  54.64 from 55.31 LD June 6 - 15 NHATS target - DOU
* 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 now 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 6 April '18

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2325 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of eighteen 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 6 April '18

Minor Planet Electronic Circulars

As of last check at 2325 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 6 Apr. '18 >>  MPEC 2018-G26 - "12:01 UT" - Daily Orbit Update


MPEC 2018-G25 - "10:21 UT" - 2018 GC


MPEC 2018-G24 - "10:18 UT" - 2018 GE


MPEC 2018-G23 - "10:16 UT" - 2018 GD


MPEC 2018-G22 - "10:13 UT" - 2018 FK29

Observers  on 6 April '18

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPECs 2018-G23 & 2018-G26 -- 2018 GD, 2018 FM3, 2018 FJ5, 2018 EA1, 2018 BN3, 2017 XK61, 2017 AV3, 2016 SR2, 2012 QP10, 2000 WY28, 510238, 496816, 331509
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2018-G26 -- 276770, 138847
T08ATLAS Mauna Loa in Hawaii, 11 in MPEC 2018-G26 -- 2018 EB, 2015 XE352, 85953, 474574, 388945, 363599, 36284, 194126, 162998, 9856, 6053
703Catalina Sky Survey (CSS) in Arizona, 14 in MPEC 2018-G26 -- 2015 DP155, 2012 DG61, 515049, 505657, 497117, 475967, 450894, 40267, 337228, 27346, 265196, 6455, 1866, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2018-G26 -- 2017 VU14
J95Great Shefford Obs. in England, 2 in MPECs 2018-G24 & 2018-G26 -- 2018 GE, 2018 EB
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 2 in MPEC 2018-G26 -- 4015, 3552
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-G26 -- 2018 BY2
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2018-G22 -- 2018 FK29
K38M57 Obs. in Italy, 1 in MPEC 2018-G26 -- 2015 XE352
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2018-G22, 2018-G23 & 2018-G25 -- 2018 GD, 2018 GC, 2018 FK29
G96Mt. Lemmon Survey (MLS) in Arizona, 21 in MPECs 2018-G22, 2018-G23, 2018-G24, 2018-G25 & 2018-G26 -- 2018 GE, 2018 GD, 2018 GC, 2018 FK29, 2018 EA4, 2018 CG2, 2017 WH14, 2015 DP155, 2011 BM24, 514571, 497117, 475967, 37655, 174050, 16657, 164207, 163696, 152637, 144332, 141765, 11066
J69North Obs. in England, 1 in MPEC 2018-G26 -- 2018 EB
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-G26 -- 2018 EB, 2015 XE352, 85953
A53Peschiera del Garda Obs. in Italy, 1 in MPEC 2018-G26 -- 2015 XE352
204Schiaparelli Obs. in Italy, 5 in MPEC 2018-G26 -- 2018 FW4, 2018 FV1, 2018 FD3, 2018 EJ4, 2018 CE2
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2018-G26 -- 2018 FS3, 2018 EQ4, 2018 DX3, 2017 TV4, 2014 QK434
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2018-G26 -- 2018 FE2, 2018 EJ4
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-G26 -- 172034
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPECs 2018-G22, 2018-G23, 2018-G24, 2018-G25 & 2018-G26 -- 2018 GE, 2018 GD, 2018 GC, 2018 FQ5, 2018 FK29, 2018 FJ5, 2018 EE, 2018 EB, 2018 BA7
Z52The Studios Obs., 2 in MPEC 2018-G26 -- 85953, 163243
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-G26 -- 2017 YS3
L01Visnjan Obs., 3 in MPECs 2018-G22, 2018-G24 & 2018-G25 -- 2018 GE, 2018 GC, 2018 FK29
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 April '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2325 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 FJ5JPL Sentry15512084-208414.792e-08-4.53-4.530JPL: Computed at 07:29 today Pacific time based on 60 observations spanning 11.913 days (2018-Mar-24.43016 to 2018-Apr-05.34349). Diameter approximately 0.350 km. from weighted mean H=19.91.
NEODyS15512084-208823.01e-07-3.71-3.710NEODyS: "Based on 50 optical observations (of which 1 are rejected as outliers) from 2018-03-24.431 to 2018-04-05.344."
2018 EL4NEODyS1551211021.58e-06-6.31-6.370NEODyS: "Based on 69 optical observations (of which 0 are rejected as outliers) from 2018-03-14.211 to 2018-04-05.325."
2018 EB4NEODyS15512099-211133.25e-06-5.86-5.870NEODyS: "Based on 85 optical observations (of which 0 are rejected as outliers) from 2018-03-12.350 to 2018-03-16.061."
2016 SR2NEODyS1551R E M O V E D-

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 6 April '18

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

1826Generated Traffic Report
1551Noted that NEODyS has removed 2016 SR2 as an impact risk - see above
Noted that NEODyS has updated its 2018 EB4 risk assessment - see above
Noted that NEODyS has updated its 2018 EL4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 FJ5 risk assessment - see above
Noted that NEODyS has updated its 2018 FJ5 risk assessment - see above
Grabbed MPEC 2018-G22 - 2018 FK29 - see above
Grabbed MPEC 2018-G23 - 2018 GD - see above
Grabbed MPEC 2018-G24 - 2018 GE - see above
Grabbed MPEC 2018-G25 - 2018 GC - see above
Grabbed MPEC 2018-G26 - Daily Orbit Update - see above