Contents  on 16 May '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 16 May '18

Eight objects reported inside ten LD

There are eight visitors reported to be inside ten lunar distances (LD) of our planet today. Nearest is outbound intruder 2010 WC9, which started the day at 0.58 LD from us, passed the Moon at 1.13 LD at 0405 UTC, and will close out the day at 3.13 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
0.53 LD yesterday 2010 WC9 68 m  0.58 to 3.13 LD May 12 - 19 intruder today, Moon closest 1.13 LD at 0405 UTC - DOU
2.16 LD May 13 2016 HP6 27 m  4.28 to 5.40 LD May 5 - 20 NHATS target
3.87 LD today 2018 JX 69 m  3.87 LD May 13 - 19 Earth closest at 0711 UTC - DOU
4.43 LD May 13 2018 JA1 24 m  5.37 to 6.19 LD May 6 - 20 NHATS target - DOU
5.29 LD May 20 2018 JG1 42 m  7.73 from 9.16 LD yesterday - May 24 risk - DOU
7.43 LD May 14 2018 JL1 16 m  7.77 to 8.23 LD May 8 - 19 NHATS target, risk
8.78 LD May 14 2018 JY 50 m  9.33 to 10.38 LD May 12 - 16 exits ten LD - DOU
9.33 LD yesterday 2018 JX1 17 m  9.40 to 9.75 LD May 13 - 17

This report was generated at 2010 UTC with the discovery of already departed 2018 JG3 (MPEC), which flew by at 2.84 LD on May 11th. Today's DOU MPEC posts the recovery of distant 2008 NP3 and follow-up for five objects in the active traffic table (above), plus four more that have departed: 2018 JK2, 2018 JW, 2018 JM, and risk-listed 2018 JN.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
9.50 LD May 29 68347 2001 KB67 371 m  37.87 from 40.87 LD May 28 - 30 radar target
5.56 LD June 10 2018 EJ4 186 m  34.38 from 35.68 LD June 4 - 16 radar/NHATS target
8.96 LD June 11 2015 DP155 162 m  25.58 from 26.40 LD June 6 - 15 NHATS target


<< Reading:  NASA/JPL has a news item about the close passage of 2010 WC9. And news agency AFP has a report that badly misstates a key point. It says, "The space rock was discovered in 2010, but only recently did astronomers determine it would not collide with our planet." JPL clearly explains that "Orbit calculations in 2010 ruled out any chance that the asteroid could pose a threat to our planet in 2018," but rediscovery this year was needed to know how close it would pass. That is, Earth passage uncertainty for this flyby had been greater than plus-or-minus ten days, which is why the object did not show in JPL's Close Approach table, and thus was missing from A/CC's own reporting until recovery.



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 an object that has approached Earth within ten LD since A/CC began these traffic reports eleven years ago but is not currently coming 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 16 May '18

The MPC's NEO Confirmation Page has 24 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 24 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 33 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 16 May '18

Minor Planet Electronic Circulars

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


MPEC 2018-K02 - "17:56 UT" - 2018 JG3


<< DOU on 16 May '18 >>  MPEC 2018-K01 - "12:06 UT" - Daily Orbit Update

Observers  on 16 May '18

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2018-K01 -- 2018 FF1, 2018 EE4, 2018 CX13, 2017 SB14, 2015 YP10, 2006 EE1, 515639, 497113, 331509
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2018-K01 -- 2018 BY2, 85628, 467309, 13553, 719
T08ATLAS Mauna Loa in Hawaii, 11 in MPEC 2018-K01 -- 2016 JP, 504711, 450648, 37655, 220839, 164201, 164121, 138847, 9856, 3122, 1627
703Catalina Sky Survey (CSS) in Arizona, 27 in MPECs 2018-K01 & 2018-K02 -- 2018 JO1, 2018 JL, 2018 JG3, 2018 JC3, 2018 GJ1, 2018 BY2, 85628, 68346, 54401, 516976, 516803, 511523, 497117, 475967, 450648, 415029, 164121, 163243, 162998, 159533, 141531, 11500, 8037, 6569, 6053, 4581, 1627
K73Gravina Obs. in Italy, 3 in MPEC 2018-K01 -- 2018 HV2, 220839, 164121
J95Great Shefford Obs. in England, 1 in MPEC 2018-K02 -- 2018 JG3
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2018-K01 -- 136839
Q66JAXA Janess-G in New South Wales, 1 in MPEC 2018-K01 -- 2018 HV2
W89LCO Cerro Tololo Aqawan A#1 in Chile, 1 in MPEC 2018-K01 -- 66391
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2018-K02 -- 2018 JG3
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2018-K01 -- 507366
G84Mt. Lemmon SkyCenter in Arizona, 1 in MPEC 2018-K01 -- 141484
G96Mt. Lemmon Survey (MLS) in Arizona, 25 in MPEC 2018-K01 -- 2018 JC, 2018 JA3, 2018 HV2, 2016 CX264, 2014 WG7, 2000 WK107, 90367, 85490, 513497, 424482, 363790, 242708, 242643, 164400, 154656, 140158, 139359, 136839, 112985, 7350, 5626, 4183, 3352, 2061, 1036
J69North Obs. in England, 1 in MPEC 2018-K01 -- 2018 HV2
Z80Northolt Branch Obs. in England, 2 in MPEC 2018-K01 -- 2018 JX, 2010 WC9
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2018-K02 -- 2018 JG3
H36Sandlot Obs. in Kansas, 2 in MPECs 2018-K01 & 2018-K02 -- 2018 JG3, 2018 JA3
204Schiaparelli Obs. in Italy, 1 in MPEC 2018-K01 -- 2018 JY1
033Schwarzschild Obs. in Germany, 1 in MPEC 2018-K02 -- 2018 JG3
G40(program code "(" (17) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2018-K02 -- 2018 JG3
Y00SONEAR in Brazil, 2 in MPEC 2018-K01 -- 2018 JX, 66391
691Spacewatch 0.9m telescope in Arizona, 16 in MPEC 2018-K01 -- 2018 JS1, 2018 JQ1, 2018 JO1, 2018 JN, 2018 JK1, 2018 JE1, 2018 JC2, 2018 HL2, 2018 HJ, 2018 HH, 2018 GL, 2018 GJ2, 2018 GJ1, 2018 CZ13, 2011 HJ7, 2000 WK107
291Spacewatch 1.8m telescope in Arizona, 10 in MPEC 2018-K01 -- 2018 JY, 2018 JW1, 2018 JK1, 2018 JG1, 2018 HA1, 2018 GY4, 2018 GF4, 2008 NP3, 2007 TR24, 2002 AU5
I52Steward Obs. Mt. Lemmon Station in Arizona, 23 in MPECs 2018-K01 & 2018-K02 -- 2018 JY, 2018 JW, 2018 JV2, 2018 JS2, 2018 JP1, 2018 JO1, 2018 JN1, 2018 JM1, 2018 JM, 2018 JL2, 2018 JL, 2018 JK2, 2018 JJ1, 2018 JH2, 2018 JG3, 2018 JG2, 2018 JF2, 2018 JD2, 2018 JC3, 2018 JC2, 2018 JA1, 2018 HV2, 2018 HS3
673!Jana Pittichova Chesley via Table Mtn. Obs. in southern California, 1 in MPEC 2018-K02 -- 2018 JG3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2018-K01 -- 2018 JN, 2018 JC2, 2013 LC7
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2018-K01 -- 2010 WC9
E08Wobblesock Obs. in New South Wales, 1 in MPEC 2018-K01 -- 2018 JC
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 May '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 JC2JPL Sentry16502050-205012.397e-07-5.39-5.390JPL: Computed at 07:38 today Pacific time based on 56 observations spanning 6.9943 days (2018-May-09.32052 to 2018-May-16.3148). Diameter approximately 0.097 km. from weighted mean H=22.70.
NEODyS16502050-209926.74e-08-5.86-5.860NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2018-05-09.321 to 2018-05-15.376."
2018 JL1NEODyS16502112-211871.19e-06-7.19-7.47-NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2018-05-08.265 to 2018-05-13.940."
2018 JG1JPL Sentry16502118-211813.276e-07-6.66-6.660JPL: Computed at 07:28 today Pacific time based on 71 observations spanning 7.9687 days (2018-May-08.17968 to 2018-May-16.14834). Diameter approximately 0.042 km. from weighted mean H=24.53.
NEODyS1650211823.77e-06-5.60-5.72-NEODyS: "Based on 68 optical observations (of which 0 are rejected as outliers) from 2018-05-08.180 to 2018-05-15.223."
2018 JNJPL Sentry16502100-210421.0887e-06-6.32-6.460JPL: Computed at 07:41 today Pacific time based on 111 observations spanning 11.029 days (2018-May-05.42349 to 2018-May-16.45257). Diameter approximately 0.034 km. from weighted mean H=25.01.
2018 GR4NEODyS16502048-21141481.31e-04-5.07-5.260NEODyS: "Based on 66 optical observations (of which 3 are rejected as outliers) from 2018-04-12.318 to 2018-05-10.298."

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 16 May '18

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

2010Generated Traffic Report
1804Grabbed MPEC 2018-K02 - 2018 JG3 - see above
1650Noted that NEODyS has updated its 2018 GR4 risk assessment - see above
Noted that JPL Sentry has updated its 2018 JC2 risk assessment - see above
Noted that NEODyS has updated its 2018 JC2 risk assessment - see above
Noted that JPL Sentry has reposted 2018 JG1 as an impact risk - see above
Noted that NEODyS has updated its 2018 JG1 risk assessment - see above
Noted that NEODyS has updated its 2018 JL1 risk assessment - see above
Noted that JPL Sentry has updated its 2018 JN risk assessment - see above
Grabbed MPEC 2018-K01 - Daily Orbit Update - see above