Contents  on 22 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 22 April '18

Seven objects reported inside ten LD

Seven minor objects are reported within ten lunar distances (LD) of our home world today. Nearest is newly announced intruder 2018 HV, which began the day at 2.58 LD from Earth, passed our planet at 0.40 LD at 1706 UTC, and 39 minutes later missed the Moon by 1.34 LD, and will finish the day out at 1.11 LD from Earth.

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 today 2018 HV 6 m  0.40 LD April 19 - 25 NEW, intruder today, Earth closest at 1706 UTC,
Moon closest 1.34 LD at 1745 UTC - MPEC
1.23 LD April 19 2018 HC1 15 m  7.30 to 10.76 LD April 17 - 22 NEW, exits ten LD - MPEC
4.06 LD April 3 2018 GE 11 m  8.89 to 9.27 LD March 13 - April 24 NHATS target
5.12 LD April 20 2018 HS 33 m  8.49 to 12.16 LD April 18 - 22 exits ten LD
7.09 LD yesterday 2018 HT 14 m  7.20 to 7.68 LD April 17 - 25
7.99 LD yesterday 2018 HN 35 m  8.00 to 8.39 LD April 19 - 24 NHATS target
9.72 LD tomorrow 2018 GG4 19 m  9.99 from 11.25 LD today - April 24 enters ten LD, risk

This report was generated at 2010 UTC with the discoveries of passing intruder 2018 HV (MPEC), outbound 2018 HC1 (MPEC), and already departed 2018 HD1 (MPEC), which flew by us at 5.66 LD on April 16th. Today's DOU MPEC has first follow-up for departed 2018 HD, additional observation of departed 2018 HU, and continuing follow-up for departed objects 2018 GZ and risk-listed 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  36.8 from 39.3 LD May 4 - 11 EPU +/- 14.00 hours*
9.65 LD May 7 1999 FN19 112 m  20.72 from 21.81 LD May 5 - 9 radar/NHATS target
6.48 LD May 9 388945 2008 TZ3 282 m  34.62 from 36.73 LD May 5 - 13
9.50 LD May 29 68347 2001 KB67 371 m  118.27 from 122.13 LD May 28 - 30 radar target
5.6   LD June 10* 2018 EJ4 186 m  64.7 from 65.9 LD June 4 - 16 EPU +/- 6 mins.*, radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  43.95 from 44.64 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 22 April '18

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 42 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 22 April '18

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2018-H68 - "16:10 UT" - 2018 HC1


MPEC 2018-H67 - "16:07 UT" - 2018 HD1


MPEC 2018-H66 - "16:04 UT" - 2018 HB1


MPEC 2018-H65 - "16:01 UT" - 2018 HA1


MPEC 2018-H64 - "15:40 UT" - 2017 GW6


<< DOU on 22 Apr. '18 >>  MPEC 2018-H63 - "12:03 UT" - Daily Orbit Update


MPEC 2018-H62 - "03:17 UT" - 2018 HV

Observers  on 22 April '18

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2018-H68 -- 2018 HC1
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2018-H63 & 2018-H64 -- 2018 GZ, 2018 GW5, 2018 FV3, 2018 FE2, 2017 GW6
T05ATLAS Haleakala in Hawaii, 5 in MPECs 2018-H63 & 2018-H68 -- 2018 HC1, 2018 DX3, 2009 SK104, 68348, 1685
K46Bamberg Obs. in Germany, 2 in MPEC 2018-H63 -- 194126, 138847
073Bucharest Obs. in Romania, 1 in MPEC 2018-H63 -- 194126
160Castelmartini Obs. in Italy, 4 in MPEC 2018-H63 -- 2018 HU, 212359, 15745, 115052
703Catalina Sky Survey (CSS) in Arizona, 29 in MPECs 2018-H63 & 2018-H68 -- 2018 HC1, 2018 GZ3, 2018 GJ1, 2018 FQ5, 2018 BY2, 2009 SK104, 2008 GB110, 2005 JD46, 2005 FN4, 85628, 66251, 53435, 498548, 350462, 337084, 333888, 276770, 248926, 24445, 194126, 186822, 172034, 162998, 159533, 154656, 138847, 12923, 1627, 1036
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2018-H64 -- 2017 GW6
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2018-H62 & 2018-H65 -- 2018 HV, 2018 HA1
K87Dettelbach Vineyard Obs. in Germany, 6 in MPEC 2018-H63 -- 2017 BD29, 2013 US3, 497117, 475967, 463664, 1866
006Fabra Obs. in Spain, 3 in MPEC 2018-H63 -- 475967, 444193, 138847
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2018-H65 & 2018-H68 -- 2018 HC1, 2018 HA1
203GiaGa Obs. in Italy, 1 in MPEC 2018-H63 -- 498548
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2018-H68 -- 2018 HC1
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPECs 2018-H62 & 2018-H68 -- 2018 HV, 2018 HC1
246KLENOT in the Czech Republic, 12 in MPECs 2018-H63 & 2018-H68 -- 2018 HC1, 2018 GZ3, 2018 GY1, 2018 GR2, 2018 GJ1, 2018 GG2, 2018 GB2, 2018 GA5, 2018 FS3, 2018 FQ5, 2018 DB2, 2008 GB110
K38M57 Obs. in Italy, 4 in MPEC 2018-H63 -- 2018 GY1, 2018 FS3, 475967, 444193
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-H67 -- 2018 HD1
900Moriyama Obs. in Japan, 1 in MPEC 2018-H68 -- 2018 HC1
G96Mt. Lemmon Survey (MLS) in Arizona, 29 in MPECs 2018-H62, 2018-H63, 2018-H65, 2018-H66 & 2018-H67 -- 2018 HV, 2018 HD1, 2018 HB1, 2018 HA1, 2018 GZ4, 2018 GN4, 2018 GB2, 2018 FQ5, 2017 SE19, 2015 FM34, 2002 ON4, 85628, 508796, 503861, 496962, 480822, 468117, 368565, 333888, 322763, 276770, 25916, 214088, 194126, 162038, 159635, 153267, 136618, 4487
K81PMPHR Obs., 1 in MPEC 2018-H63 -- 138847
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-H66 -- 2018 HB1
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2018-H66 -- 2018 HB1
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2018-H62, 2018-H66 & 2018-H67 -- 2018 HV, 2018 HD1, 2018 HB1
204Schiaparelli Obs. in Italy, 2 in MPECs 2018-H62 & 2018-H65 -- 2018 HV, 2018 HA1
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2018-H63 -- 2018 FQ5
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2018-H63 -- 2018 HK, 2018 GT1, 2018 GE5, 2018 GA4
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2018-H63 -- 2018 HD, 2018 GR4, 2018 GP2, 2018 GL2, 2018 GF2, 2018 GE2
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2018-H66 -- 2018 HB1
I52Steward Obs. Mt. Lemmon Station in Arizona, 11 in MPECs 2018-H62, 2018-H63, 2018-H65, 2018-H66, 2018-H67 & 2018-H68 -- 2018 HV, 2018 HP, 2018 HD1, 2018 HC1, 2018 HB1, 2018 HA1, 2018 GY4, 2018 GH, 2018 GC5, 2018 GA5, 2018 GA4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-H63 -- 2017 VO15
L01Visnjan Obs., 4 in MPECs 2018-H62, 2018-H65, 2018-H66 & 2018-H68 -- 2018 HV, 2018 HC1, 2018 HB1, 2018 HA1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 April '18

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2359 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 HA1JPL Sentry18002026-210253.69262e-08-4.91-4.970JPL: Computed at 10:01 today Pacific time based on 27 observations spanning 2.9738 days (2018-Apr-19.32466 to 2018-Apr-22.29842). Diameter approximately 0.140 km. from weighted mean H=21.88.
2018 GA5JPL Sentry1800R E M O V E DJPL: Risk listing removed at 1450 UTC today
NEODyS1800209912.72e-10-6.44-6.440NEODyS #2 for the day
2018 GR4JPL Sentry18002048-2101390.00022942234-4.80-5.130JPL: Computed at 08:18 today Pacific time based on 51 observations spanning 10.092 days (2018-Apr-12.31705 to 2018-Apr-22.40898). Diameter approximately 0.013 km. from weighted mean H=27.01.
NEODyS06432048-21181751.13e-04-5.10-5.4-NEODyS: "Based on 48 optical observations (of which 1 are rejected as outliers) from 2018-04-12.318 to 2018-04-21.315."
2018 GG4NEODyS06432058-207021.85e-07-7.14-7.390NEODyS: "Based on 36 optical observations (of which 2 are rejected as outliers) from 2018-04-13.438 to 2018-04-21.365."
2018 GL2JPL Sentry18002050-209379.968642e-06-4.68-4.730JPL: Computed at 07:37 today Pacific time based on 63 observations spanning 11.204 days (2018-Apr-11.23475 to 2018-Apr-22.43867). Diameter approximately 0.049 km. from weighted mean H=24.21.
NEODyS06432060-2109114.49e-06-5.02-5.120NEODyS: "Based on 60 optical observations (of which 0 are rejected as outliers) from 2018-04-11.236 to 2018-04-21.334."
2018 GE2JPL Sentry18002054-2117878.93428326e-05-5.31-5.890JPL: Computed at 07:53 today Pacific time based on 91 observations spanning 11.984 days (2018-Apr-10.40973 to 2018-Apr-22.39421). Diameter approximately 0.013 km. from weighted mean H=27.03.
NEODyS06432054-21182376.84e-05-5.42-6.03-NEODyS: "Based on 89 optical observations (of which 4 are rejected as outliers) from 2018-04-10.411 to 2018-04-21.269."

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 22 April '18

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

2010Generated Traffic Report
1800Noted that JPL Sentry has removed 2018 GA5 as an impact risk - see above
Noted that NEODyS has reposted 2018 GA5 as an impact risk - see above
Noted that JPL Sentry 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 JPL Sentry has posted 2018 HA1 as an impact risk - see above
Grabbed MPEC 2018-H63 - Daily Orbit Update - see above
Grabbed MPEC 2018-H64 - 2017 GW6 - see above
Grabbed MPEC 2018-H65 - 2018 HA1 - see above
Grabbed MPEC 2018-H66 - 2018 HB1 - see above
Grabbed MPEC 2018-H67 - 2018 HD1 - see above
Grabbed MPEC 2018-H68 - 2018 HC1 - see above
0643Noted that NEODyS has removed 2018 GA5 as an impact risk - see above
Noted that NEODyS has updated its 2018 GE2 risk assessment - see above
Noted that NEODyS has updated its 2018 GG4 risk assessment - see above
Noted that NEODyS has updated its 2018 GL2 risk assessment - see above
Noted that NEODyS has updated its 2018 GR4 risk assessment - see above
0425Grabbed MPEC 2018-H62 - 2018 HV - see above