Contents  on 26 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 26 April '18

Two objects reported inside ten LD

Two minor planets are reported to be less than ten lunar distances (LD) from our home world today. Risk-listed intruder 2018 HW1 heads away from 4.45 to 5.50 LD and newly announced 2018 HE2 leaves our ten-LD traffic reporting zone, passing from 8.74 to 10.39 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
0.89 LD April 21 2018 HW1 22 m  4.45 to 5.50 LD April 12 - May 1 intruder, NHATS target, risk
1.67 LD April 20 2018 HE2 9 m  8.74 to 10.39 LD April 14 - 26 NEW, exits ten LD - MPEC

This report was generated at 1740 UTC with the discovery of outbound 2018 HE2 (MPEC) and with first follow-up for departed objects 2018 HY1 and 2018 HX1 in today's DOU MPEC, along with continuing follow-up for approaching objects 2018 EJ4 and 2015 DP155, and for three departed objects: 2018 HL1 and risk-listed objects 2018 GG4 and 2018 GE2.

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  27.2 from 29.6 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  16.50 from 17.53 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  26.35 from 28.40 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  103.32 from 106.98 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  59.8 from 61.0 LD June 4 - 16 EPU +/- 5 mins.*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  41.13 from 41.85 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. 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 26 April '18

The MPC's NEO Confirmation Page has 14 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fourteen objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 27 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 26 April '18

Minor Planet Electronic Circulars

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


MPEC 2018-H93 - "17:35 UT" - Comet P/2018 H2 (Panstarrs)


MPEC 2018-H92 - "15:24 UT" - 2018 HK2


MPEC 2018-H91 - "15:20 UT" - 2018 HE2


MPEC 2018-H90 - "15:17 UT" - 2018 HJ2


MPEC 2018-H89 - "15:13 UT" - 2018 HH2


MPEC 2018-H88 - "15:09 UT" - 2018 HG2


MPEC 2018-H87 - "15:05 UT" - 2018 HF2


MPEC 2018-H86 - "14:55 UT" - 2018 HD2


<< DOU on 26 Apr. '18 >>  MPEC 2018-H85 - "12:05 UT" - Daily Orbit Update

Observers  on 26 April '18

A total of 51 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2018-H89, 2018-H90 & 2018-H91 -- 2018 HJ2, 2018 HH2, 2018 HE2
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2018-H85 -- 2018 FY1, 2018 DX3, 2009 SK104, 68348, 450648, 5604, 1685
I47Auger Obs. in Argentina, 1 in MPEC 2018-H93 -- P/2018 H2
215Buchloe Obs. in Germany, 1 in MPEC 2018-H93 -- P/2018 H2
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2018-H93 -- P/2018 H2
160Castelmartini Obs. in Italy, 1 in MPEC 2018-H89 -- 2018 HH2
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2018-H85, 2018-H89, 2018-H90 & 2018-H91 -- 2018 HJ2, 2018 HH2, 2018 HE2, 2017 WH14, 2016 JP, 2015 RL82, 2013 US3, 37655, 164201, 164121, 153195, 152931
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-H93 -- P/2018 H2
K65Cesena Obs. in Italy, 1 in MPEC 2018-H89 -- 2018 HH2
A77Chante-Perdrix Obs. in France, 1 in MPEC 2018-H93 -- P/2018 H2
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2018-H93 -- P/2018 H2
006Fabra Obs. in Spain, 1 in MPEC 2018-H85 -- 444193
734Farpoint Obs. in Kansas, 4 in MPECs 2018-H88, 2018-H89, 2018-H90 & 2018-H91 -- 2018 HJ2, 2018 HH2, 2018 HG2, 2018 HE2
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2018-H89, 2018-H90 & 2018-H93 -- 2018 HJ2, 2018 HH2, P/2018 H2
203GiaGa Obs. in Italy, 1 in MPEC 2018-H89 -- 2018 HH2
K88GINOP-KHK in Hungary, 2 in MPECs 2018-H89 & 2018-H93 -- 2018 HH2, P/2018 H2
U699Steven M. Tilley in Louisiana via iTelescope Obs. Auberry in northern California, 1 in MPEC 2018-H89 -- 2018 HH2
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-H93 -- P/2018 H2
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPECs 2018-H89 & 2018-H93 -- 2018 HH2, P/2018 H2
585Kiev Comet Station in Ukraine, 1 in MPEC 2018-H93 -- P/2018 H2
246KLENOT in the Czech Republic, 1 in MPEC 2018-H93 -- P/2018 H2
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2018-H93 -- P/2018 H2
K38M57 Obs. in Italy, 3 in MPECs 2018-H85 & 2018-H89 -- 2018 HH2, 2018 GY1, 2013 US3
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2018-H86, 2018-H87, 2018-H88, 2018-H89, 2018-H90, 2018-H91 & 2018-H92 -- 2018 HK2, 2018 HJ2, 2018 HH2, 2018 HG2, 2018 HF2, 2018 HE2, 2018 HD2
C10Maisoncelles Obs. in France, 1 in MPEC 2018-H93 -- P/2018 H2
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2018-H93 -- P/2018 H2
118Modra Obs. in Slovakia, 1 in MPEC 2018-H93 -- P/2018 H2
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2018-H85, 2018-H86, 2018-H87, 2018-H88, 2018-H89 & 2018-H92 -- 2018 HK2, 2018 HH2, 2018 HG2, 2018 HF2, 2018 HD2, 2001 TZ1, 285339, 174050, 152931, 6455
644NEAT's Mt. Palomar telescope in southern California, 2 in MPEC 2018-H85 -- 13651, 11311
608NEAT's USAF Haleakala telescope in Hawaii, 3 in MPEC 2018-H85 -- 138947, 138846, 111253
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-H89 -- 2018 HH2
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2018-H93 -- P/2018 H2
I41Palomar Transient Factory (PTF) in southern California, 3 in MPEC 2018-H85 -- 2015 DP155, 474574, 185853
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2018-H88, 2018-H92 & 2018-H93 -- 2018 HK2, 2018 HG2, P/2018 H2
A53Peschiera del Garda Obs. in Italy, 1 in MPEC 2018-H85 -- 2013 US3
K81PMPHR Obs., 1 in MPEC 2018-H85 -- 138847
W71Rand II Obs. in New York, 4 in MPEC 2018-H85 -- 2018 FQ5, 2018 BY2, 444193, 37655
C95SATINO-1 in France, 1 in MPEC 2018-H85 -- 2017 WH14
204Schiaparelli Obs. in Italy, 14 in MPECs 2018-H85, 2018-H89 & 2018-H90 -- 2018 HR, 2018 HJ2, 2018 HH2, 2018 GZ3, 2018 GT1, 2018 GS1, 2018 GH, 2018 EM2, 2018 CZ13, 2017 VL15, 2013 US3, 2010 JG88, 2005 FN4, 515049
033Schwarzschild Obs. in Germany, 1 in MPEC 2018-H93 -- P/2018 H2
2605program code 5 using the Siding Spring Digitized Sky Survey in New South Wales, 1 in MPEC 2018-H85 -- 138846
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-H93 -- P/2018 H2
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-H85 -- 162168
587Sormano Obs. in Italy, 2 in MPECs 2018-H89 & 2018-H90 -- 2018 HJ2, 2018 HH2
L06Sormano2 Obs. in Italy, 1 in MPEC 2018-H93 -- P/2018 H2
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2018-H85, 2018-H89 & 2018-H93 -- 2018 HH2, 2018 HB1, P/2018 H2, 2018 EQ4, 2016 CX264, 2013 JN22
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2018-H85 -- 2018 GL1, 2018 GE2, 2018 FY, 2018 BA7, 2017 BD29, 2013 US3, 2001 TZ1
I52Steward Obs. Mt. Lemmon Station in Arizona, 34 in MPECs 2018-H85, 2018-H86, 2018-H87, 2018-H88, 2018-H89, 2018-H90, 2018-H91, 2018-H92 & 2018-H93 -- 2018 HY1, 2018 HX1, 2018 HV1, 2018 HU1, 2018 HT1, 2018 HS1, 2018 HR1, 2018 HP, 2018 HO1, 2018 HL1, 2018 HK2, 2018 HK, 2018 HJ2, 2018 HH2, 2018 HH, 2018 HG2, 2018 HF2, 2018 HE2, 2018 HD2, 2018 HB1, P/2018 H2, 2018 GY4, 2018 GY1, 2018 GX4, 2018 GT3, 2018 GT1, 2018 GO2, 2018 GK1, 2018 GJ4, 2018 GG5, 2018 GD3, 2018 FL3, 2018 EJ4, 2017 UX5
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-H93 -- P/2018 H2
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2018-H85 -- 2018 GG4
L01Visnjan Obs., 2 in MPECs 2018-H89 & 2018-H90 -- 2018 HJ2, 2018 HH2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 HJ2JPL Sentry16312085-208511.002e-04-3.78-3.780JPL: Computed at 09:28 today Pacific time based on 50 observations spanning 3.0004 days (2018-Apr-23.41101 to 2018-Apr-26.4114). Diameter approximately 0.052 km. from weighted mean H=24.06.
2018 GG4JPL Sentry16312058-207021.4336e-07-7.23-7.450JPL #2 for the day: Computed at 08:58 today Pacific time based on 34 observations spanning 11.187 days (2018-Apr-13.43759 to 2018-Apr-24.624861). Diameter approximately 0.019 km. from weighted mean H=26.22.
NEODyS15472058-207025.73e-08-7.66-7.820NEODyS: "Based on 38 optical observations (of which 2 are rejected as outliers) from 2018-04-13.438 to 2018-04-24.626."
2018 GE2JPL Sentry15472057-2115877.7980824e-05-5.37-5.940JPL: Computed at 08:05 today Pacific time based on 99 observations spanning 15.854 days (2018-Apr-10.40973 to 2018-Apr-26.26355). Diameter approximately 0.013 km. from weighted mean H=27.04.

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 26 April '18

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

1800Grabbed MPEC 2018-H93 - Comet P/2018 H2 (Panstarrs) - see above
1740Generated Traffic Report
1631Noted that JPL Sentry has updated its 2018 GG4 risk assessment - see above
Noted that JPL Sentry has posted 2018 HJ2 as an impact risk - see above
1547Noted that JPL Sentry has updated its 2018 GE2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 GG4 risk assessment - see above
Noted that NEODyS has updated its 2018 GG4 risk assessment - see above
Grabbed MPEC 2018-H85 - Daily Orbit Update - see above
Grabbed MPEC 2018-H86 - 2018 HD2 - see above
Grabbed MPEC 2018-H87 - 2018 HF2 - see above
Grabbed MPEC 2018-H88 - 2018 HG2 - see above
Grabbed MPEC 2018-H89 - 2018 HH2 - see above
Grabbed MPEC 2018-H90 - 2018 HJ2 - see above
Grabbed MPEC 2018-H91 - 2018 HE2 - see above
Grabbed MPEC 2018-H92 - 2018 HK2 - see above