Contents  on 24 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 24 April '18

Six objects reported inside ten LD

Bulletin - 2239, updated 2356 UTC:  Three new discoveries of close passers have been announced.

Earth passageI D~Size~Inside ten LDNotes
0.89 LD at 2253 UTC April 212018 HW119 m April 12 - May 1intruder - MPEC
2.69 LD at 0737 UTC April 222018 HX143 m April 20 - 24MPEC
9.49 LD at 1808 UTC yesterday2018 HY129 m April 21 - 26MPEC


Six transient natural objects are known to be traveling within ten lunar distances (LD) of our planet today. Nearest is intruder 2018 HV, which moves out from 4.62 to 8.19 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
0.40 LD April 22 2018 HV 6 m  4.62 to 8.19 LD April 19 - 25 intruder
4.06 LD April 3 2018 GE 11 m  9.65 to 10.04 LD March 13 - today NHATS target, exits ten LD - DOU
4.67 LD April 21 2018 HL1 50 m  9.11 to 12.01 LD April 18 - 24 NEW, exits ten LD - MPEC, DOU
7.09 LD April 21 2018 HT 14 m  8.47 to 9.51 LD April 17 - 25
7.99 LD April 21 2018 HN 35 m  9.30 to 10.60 LD April 19 - 24 NHATS target, exits ten LD
9.72 LD yesterday 2018 GG4 19 m  9.78 to 10.67 LD April 22 - 24 exits ten LD, risk

This report was generated at 1818 UTC with the discovery of 2018 HL1 (MPEC, DOU, see traffic table above), and with first follow-up for departed 2018 HC1 in today's DOU MPEC along with continuing follow-up for approaching objects 2018 EJ4, 388945 2008 TZ3, and 1999 FN19, for outbound 2018 GE, and for departed objects 2018 HU and risk-listed 2018 GE2, plus astrometry from a month ago for 2018 FB and from last July for 2017 BS5.

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  32.0 from 34.4 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  18.57 from 19.64 LD May 5 - 9 radar/NHATS target - DOU
6.48 LD May 9 388945 2008 TZ3 282 m  30.45 from 32.53 LD May 5 - 13 DOU
9.50 LD May 29 68347 2001 KB67 371 m  110.69 from 114.45 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  62.2 from 63.5 LD June 4 - 16 EPU +/- 5 mins.*, radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  42.55 from 43.25 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 24 April '18

The MPC's NEO Confirmation Page has 23 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 23 objects listed. Of these, five were "one nighters." So far The Tracking News has counted a total of 40 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 24 April '18

Minor Planet Electronic Circulars

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


MPEC 2018-H82 - "22:23 UT" - 2018 HW1


MPEC 2018-H81 - "22:20 UT" - 2018 HY1


MPEC 2018-H80 - "22:16 UT" - 2018 HX1


MPEC 2018-H79 - "22:12 UT" - 2018 HV1


MPEC 2018-H78 - "22:09 UT" - 2018 HR1


MPEC 2018-H77 - "22:05 UT" - 2018 HU1


MPEC 2018-H76 - "22:01 UT" - 2018 HT1


MPEC 2018-H75 - "21:58 UT" - 2018 HS1


MPEC 2018-H74 - "21:54 UT" - 2018 HQ1


MPEC 2018-H73 - "21:50 UT" - 2018 HP1


MPEC 2018-H72 - "21:45 UT" - 2018 HO1


<< DOU on 24 Apr. '18 >>  MPEC 2018-H71 - "12:05 UT" - Daily Orbit Update


MPEC 2018-H70 - "10:29 UT" - 2018 HL1

Observers  on 24 April '18

A total of 45 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 1 in MPEC 2018-H71 -- 1036
E23Arcadia Obs. in New South Wales, 2 in MPECs 2018-H71 & 2018-H81 -- 2018 HY1, 2018 HL1
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2018-H71 -- 2018 GV3, 2018 GP2, 2018 FU, 2018 FJ5, 2018 CB15, 490684
T05ATLAS Haleakala in Hawaii, 9 in MPEC 2018-H71 -- 2018 GJ1, 2018 FS3, 2018 BY2, 2008 GB110, 497117, 475967, 388945, 212359, 9856
073Bucharest Obs. in Romania, 1 in MPEC 2018-H71 -- 194126
160Castelmartini Obs. in Italy, 9 in MPECs 2018-H71, 2018-H72, 2018-H80 & 2018-H81 -- 2018 HY1, 2018 HX1, 2018 HO1, 2018 BY2, 66251, 374851, 163243, 138847, 9856
703Catalina Sky Survey (CSS) in Arizona, 30 in MPECs 2018-H70, 2018-H71, 2018-H72 & 2018-H73 -- 2018 HP1, 2018 HO1, 2018 HL1, 2018 GT1, 2018 GR2, 2018 FS3, 2018 DB2, 2018 CE2, 2018 BY2, 2014 JC31, 2012 FN62, 2008 GB110, 85628, 66251, 54686, 514652, 497117, 475967, 474574, 388945, 337084, 330659, 24761, 184990, 15745, 155341, 138847, 12923, 9856, 1627
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-H74 -- 2018 HQ1
K65Cesena Obs. in Italy, 2 in MPECs 2018-H72 & 2018-H80 -- 2018 HX1, 2018 HO1
734Farpoint Obs. in Kansas, 2 in MPECs 2018-H76 & 2018-H80 -- 2018 HX1, 2018 HT1
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2018-H72, 2018-H73 & 2018-H80 -- 2018 HX1, 2018 HP1, 2018 HO1
203GiaGa Obs. in Italy, 2 in MPECs 2018-H72 & 2018-H73 -- 2018 HP1, 2018 HO1
K88GINOP-KHK in Hungary, 7 in MPECs 2018-H71, 2018-H72, 2018-H73, 2018-H76, 2018-H79, 2018-H80 & 2018-H81 -- 2018 HY1, 2018 HX1, 2018 HV1, 2018 HT1, 2018 HP1, 2018 HO1, 2018 FB
J95Great Shefford Obs. in England, 4 in MPECs 2018-H72, 2018-H75, 2018-H76 & 2018-H79 -- 2018 HV1, 2018 HT1, 2018 HS1, 2018 HO1
G48Harlingten Research Obs. in New Mexico, 2 in MPEC 2018-H71 -- 2018 FQ5, 2018 BY2
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-H82 -- 2018 HW1
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-H81 -- 2018 HY1
Q66JAXA Janess-G in New South Wales, 1 in MPEC 2018-H70 -- 2018 HL1
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 3 in MPECs 2018-H72, 2018-H73 & 2018-H76 -- 2018 HT1, 2018 HP1, 2018 HO1
585Kiev Comet Station in Ukraine, 1 in MPEC 2018-H72 -- 2018 HO1
246KLENOT in the Czech Republic, 1 in MPEC 2018-H72 -- 2018 HO1
Z43Landehen Obs., 6 in MPEC 2018-H71 -- 2018 BY2, 85628, 337084, 194126, 1866, 1627
W87LCO Cerro Tololo C in Chile, 2 in MPEC 2018-H71 -- 2004 FJ29, 267940
Q63LCO Siding Spring A in New South Wales, 1 in MPEC 2018-H71 -- 2004 FJ29
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2018-H70, 2018-H74, 2018-H75, 2018-H77, 2018-H79, 2018-H80 & 2018-H81 -- 2018 HY1, 2018 HX1, 2018 HV1, 2018 HU1, 2018 HS1, 2018 HQ1, 2018 HL1
932McCarthy Obs. in Connecticut, 1 in MPEC 2018-H80 -- 2018 HX1
G84Mt. Lemmon SkyCenter in Arizona, 1 in MPEC 2018-H71 -- 2005 JY80
G96Mt. Lemmon Survey (MLS) in Arizona, 30 in MPECs 2018-H71, 2018-H72, 2018-H73, 2018-H74, 2018-H75, 2018-H76, 2018-H77, 2018-H78, 2018-H79 & 2018-H81 -- 2018 HY1, 2018 HV1, 2018 HU1, 2018 HT1, 2018 HS1, 2018 HR1, 2018 HQ1, 2018 HP1, 2018 HO1, 2018 HK, 2018 GR5, 2018 GG5, 2018 GF4, 2018 FQ5, 2008 KZ5, 2005 HM3, 68346, 498548, 390725, 36183, 350713, 24445, 214869, 194126, 172034, 162635, 159533, 152679, 136874, 4947
Z80Northolt Branch Obs. in England, 6 in MPEC 2018-H71 -- 2018 GY1, 2018 GJ1, 2016 JP, 194126, 164201, 1627
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2018-H72 -- 2018 HO1
I41Palomar Transient Factory (PTF) in southern California, 4 in MPECs 2018-H70, 2018-H71 & 2018-H80 -- 2018 HX1, 2018 HL1, 474574, 115052
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-H71 -- 2018 GR5
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2018-H71 -- 2018 GR5
W71Rand II Obs. in New York, 7 in MPEC 2018-H71 -- 2017 PT25, 2017 PR25, 2017 OP68, 2017 NM6, 2017 BS5, 90075, 11500
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2018-H72 & 2018-H76 -- 2018 HT1, 2018 HO1
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2018-H80 -- 2018 HX1
204Schiaparelli Obs. in Italy, 2 in MPECs 2018-H72 & 2018-H76 -- 2018 HT1, 2018 HO1
Y00SONEAR in Brazil, 1 in MPEC 2018-H82 -- 2018 HW1
587Sormano Obs. in Italy, 3 in MPECs 2018-H72, 2018-H80 & 2018-H81 -- 2018 HY1, 2018 HX1, 2018 HO1
691Spacewatch 0.9m telescope in Arizona, 11 in MPECs 2018-H71, 2018-H77 & 2018-H79 -- 2018 HV1, 2018 HU1, 2018 HA1, 2018 GW4, 2018 GG5, 2018 EQ4, 2018 EE, 2018 CZ13, 2013 JN22, 2005 JY80, 498548
291Spacewatch 1.8m telescope in Arizona, 14 in MPEC 2018-H71 -- 2018 GY1, 2018 GX, 2018 GR4, 2018 GL2, 2018 GE2, 2018 GE, 2018 GD, 2018 GA2, 2018 FY, 2018 FV, 2018 FP3, 2018 FJ5, 2018 FC1, 2018 EJ4
I52Steward Obs. Mt. Lemmon Station in Arizona, 26 in MPECs 2018-H70, 2018-H71, 2018-H72, 2018-H73, 2018-H74, 2018-H75, 2018-H76, 2018-H77, 2018-H78, 2018-H79, 2018-H80 & 2018-H81 -- 2018 HY1, 2018 HX1, 2018 HV1, 2018 HU1, 2018 HU, 2018 HT1, 2018 HS1, 2018 HR1, 2018 HQ1, 2018 HQ, 2018 HP1, 2018 HP, 2018 HO1, 2018 HL1, 2018 HC1, 2018 HB1, 2018 HA1, 2018 GT1, 2018 GS1, 2018 GO4, 2018 GH5, 2018 GG5, 2018 GE5, 2018 CX13, 2016 JP, 2015 UK52
Z52The Studios Obs., 1 in MPEC 2018-H71 -- 138847
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2018-H71 -- 2018 AE3, 2017 HX3
L01Visnjan Obs., 8 in MPECs 2018-H72, 2018-H73, 2018-H74, 2018-H75, 2018-H76, 2018-H77, 2018-H78 & 2018-H79 -- 2018 HV1, 2018 HU1, 2018 HT1, 2018 HS1, 2018 HR1, 2018 HQ1, 2018 HP1, 2018 HO1
C51WISE in Earth polar orbit, 3 in MPEC 2018-H71 -- 1999 FN19, 90367, 358744
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 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 HW1JPL Sentry23582104-211869.27193e-05-5.06-5.170JPL: Computed at 16:37 today Pacific time based on 15 observations spanning 1.2679 days (2018-Apr-23.20248 to 2018-Apr-24.47037). Diameter approximately 0.020 km. from weighted mean H=26.14.
2018 HA1JPL Sentry1545R E M O V E DJPL: Risk listing removed at 1518 UTC today
NEODyS1545R E M O V E D-
2018 GR4JPL Sentry15452048-2100450.00027512847-4.74-5.070JPL: Computed at 08:21 today Pacific time based on 57 observations spanning 11.849 days (2018-Apr-12.31705 to 2018-Apr-24.16576). Diameter approximately 0.013 km. from weighted mean H=27.04.
NEODyS15452048-21181711.27e-04-5.05-5.27-NEODyS: "Based on 54 optical observations (of which 1 are rejected as outliers) from 2018-04-12.318 to 2018-04-23.155."
2018 GL2NEODyS21422060-2113114.82e-06-4.99-5.090NEODyS: "Based on 66 optical observations (of which 0 are rejected as outliers) from 2018-04-11.236 to 2018-04-23.381."
JPL Sentry15452050-209358.454344e-06-4.75-4.800JPL: Computed at 08:18 today Pacific time based on 66 observations spanning 12.145 days (2018-Apr-11.23475 to 2018-Apr-23.37981). Diameter approximately 0.049 km. from weighted mean H=24.21.
2018 GE2JPL Sentry15452060-2117857.9716974e-05-5.36-5.930JPL: Computed at 08:24 today Pacific time based on 97 observations spanning 13.798 days (2018-Apr-10.40973 to 2018-Apr-24.20808). Diameter approximately 0.013 km. from weighted mean H=27.03.
NEODyS15452054-21182506.55e-05-5.44-6.08-NEODyS: "Based on 95 optical observations (of which 4 are rejected as outliers) from 2018-04-10.411 to 2018-04-23.181."

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 24 April '18

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

2358Noted that JPL Sentry has posted 2018 HW1 as an impact risk - see above
2237Grabbed MPEC 2018-H72 - 2018 HO1 - see above
Grabbed MPEC 2018-H73 - 2018 HP1 - see above
Grabbed MPEC 2018-H74 - 2018 HQ1 - see above
Grabbed MPEC 2018-H75 - 2018 HS1 - see above
Grabbed MPEC 2018-H76 - 2018 HT1 - see above
Grabbed MPEC 2018-H77 - 2018 HU1 - see above
Grabbed MPEC 2018-H78 - 2018 HR1 - see above
Grabbed MPEC 2018-H79 - 2018 HV1 - see above
Grabbed MPEC 2018-H80 - 2018 HX1 - see above
Grabbed MPEC 2018-H81 - 2018 HY1 - see above
Grabbed MPEC 2018-H82 - 2018 HW1 - see above
2142Noted that NEODyS has updated its 2018 GL2 risk assessment - see above
1818Generated Traffic Report
1545Noted 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 GL2 risk assessment - see above
Noted that JPL Sentry has updated its 2018 GR4 risk assessment - see above
Noted that NEODyS has updated its 2018 GR4 risk assessment - see above
Noted that JPL Sentry has removed 2018 HA1 as an impact risk - see above
Noted that NEODyS has removed 2018 HA1 as an impact risk - see above
Grabbed MPEC 2018-H70 - 2018 HL1 - see above
Grabbed MPEC 2018-H71 - Daily Orbit Update - see above