Contents  on 29 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 29 April '18

Two objects reported inside ten LD

Two asteroidal objects are known to be within ten lunar distances (LD) of our planet today. Risk-listed intruder 2018 HW1 is headed away from 7.62 to 8.68 LD and newly announced 2018 HM2 is inbound from 9.10 to 8.80 LD.

Neighborhood Traffic
Earth passage I D ~Size Distance today  Inside ten LD Notes
0.89 LD April 21 2018 HW1 22 m  7.62 to 8.68 LD April 12 - May 1 intruder, NHATS target, risk
8.72 LD tomorrow 2018 HM2 62 m  8.80 from 9.10 LD April 27 - May 4 NEW - MPEC
Approaching (sorted by 10-LD bubble entry date)
6.2   LD May 8* 2016 JQ5 8 m  20.3 from 22.6 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  13.62 from 14.54 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  20.35 from 22.33 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  92.61 from 96.13 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  56.04 from 57.28 LD June 4 - 16 radar/NHATS target - DOU
8.96 LD June 11 2015 DP155 162 m  38.96 from 39.69 LD June 6 - 15 NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1740 UTC with the discovery of inbound 2018 HM2 (MPEC) and with follow-up in today's DOU MPEC for approaching 2018 EJ4 and departed 2018 HU.



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 29 April '18

The MPC's NEO Confirmation Page has 9 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of seventeen 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 29 April '18

Minor Planet Electronic Circulars

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


MPEC 2018-H104 - "16:34 UT" - 2006 SP198


<< DOU on 29 Apr. '18 >>  MPEC 2018-H103 - "12:04 UT" - Daily Orbit Update


MPEC 2018-H102 - "11:29 UT" - 2018 HM2


MPEC 2018-H101 - "11:26 UT" - 2018 HL2


MPEC 2018-H100 - "11:15 UT" - 2017 AZ13

Observers  on 29 April '18

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
Z35Aras de los Olmos Obs. in Spain, 1 in MPEC 2018-H103 -- 1866
073Bucharest Obs. in Romania, 1 in MPEC 2018-H103 -- 444193
160Castelmartini Obs. in Italy, 12 in MPEC 2018-H103 -- 2018 GY1, 2018 BY2, 66251, 498548, 475967, 374851, 337084, 172034, 163243, 138847, 9856, 8037
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-H102 -- 2018 HM2
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-H103 -- 2018 HU
734Farpoint Obs. in Kansas, 1 in MPEC 2018-H102 -- 2018 HM2
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-H101 & 2018-H102 -- 2018 HM2, 2018 HL2
K88GINOP-KHK in Hungary, 1 in MPEC 2018-H102 -- 2018 HM2
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-H102 -- 2018 HM2
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-H102 -- 2018 HM2
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 5 in MPECs 2018-H102 & 2018-H103 -- 2018 HM2, 2018 FQ5, 2016 JP, 2015 TX143, 2013 US3
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 11 in MPECs 2018-H101 & 2018-H103 -- 2018 HV1, 2018 HL2, 2018 HJ2, 2018 GL1, 2018 GA, 2018 FS3, 2018 EQ4, 2018 EJ4, 2018 EB, 2008 UZ94, 2005 JU81
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-H101 -- 2018 HL2
118Modra Obs. in Slovakia, 1 in MPEC 2018-H102 -- 2018 HM2
900Moriyama Obs. in Japan, 1 in MPEC 2018-H102 -- 2018 HM2
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2018-H101 & 2018-H104 -- 2018 HL2, 2006 SP198
644NEAT's Mt. Palomar telescope in southern California, 4 in MPEC 2018-H103 -- 141079, 141053, 141052, 140288
608NEAT's USAF Haleakala telescope in Hawaii, 2 in MPEC 2018-H103 -- 141079, 141053
C47Nonndorf Obs. in Austria, 1 in MPEC 2018-H102 -- 2018 HM2
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-H104 -- 2006 SP198
A48Povegliano Veronese Obs. in Italy, 1 in MPEC 2018-H103 -- 2018 BY2
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2018-H103 -- 2018 DX3
C95SATINO-1 in France, 3 in MPECs 2018-H101, 2018-H102 & 2018-H103 -- 2018 HM2, 2018 HL2, 2018 BY2
645Sloan Digital Sky Survey in New Mexico, 1 in MPEC 2018-H104 -- 2006 SP198
Y00SONEAR in Brazil, 1 in MPEC 2018-H103 -- 514568
W34Squirrel Valley Obs. in North Carolina, 4 in MPECs 2018-H102 & 2018-H103 -- 2018 HM2, 2016 JP, 37655, 1866
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPECs 2018-H101 & 2018-H102 -- 2018 HM2, 2018 HL2
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2018-H102 -- 2018 HM2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-H100 -- 2017 AZ13
L01Visnjan Obs., 2 in MPECs 2018-H101 & 2018-H102 -- 2018 HM2, 2018 HL2
718Wiggins Obs. in Utah, 1 in MPEC 2018-H102 -- 2018 HM2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 Sentry16022085-208511.085e-04-3.76-3.760JPL: Computed at 07:36 today Pacific time based on 52 observations spanning 5.8802 days (2018-Apr-23.41101 to 2018-Apr-29.2912). Diameter approximately 0.051 km. from weighted mean H=24.10.
2018 HW1NEODyS16022105-211645.59e-08-8.19-8.390NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2018-04-23.203 to 2018-04-27.037."
2007 CM26JPL Sentry16022031-2101387.01402e-08-7.06-7.700JPL: Computed at 12:06 March 13th Pacific time based on 8 observations spanning .14397 days (2018-Mar-07.37107 to 2018-Mar-07.51504). Diameter approximately 0.029 km. from weighted mean H=25.37.

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 29 April '18

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

1740Generated Traffic Report
1700Grabbed MPEC 2018-H104 - 2006 SP198 - see above
1602Noted that JPL Sentry has posted 2007 CM26 as an impact risk - see above
Noted that JPL Sentry has updated its 2018 HJ2 risk assessment - see above
Noted that NEODyS has updated its 2018 HW1 risk assessment - see above
Grabbed MPEC 2018-H100 - 2017 AZ13 - see above
Grabbed MPEC 2018-H101 - 2018 HL2 - see above
Grabbed MPEC 2018-H102 - 2018 HM2 - see above
Grabbed MPEC 2018-H103 - Daily Orbit Update - see above