Contents  on 1 March '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 1 March '18

Eleven objects reported inside ten LD

Eleven minor planets are reported to be within ten lunar distances (LD) of our planet today. Nearest is inbound intruder 2018 DV1, which enters the Earth-Moon system, flying in from 1.75 to 0.45 LD and passing the Moon at 0.35 LD at 1621 UTC. Much further away, 2017 DR109 is calculated to leave our ten-LD traffic reporting sphere, moving from about 8.7 to 10.2 LD*. This object has not been favorably located in the sky to be re-discovered on this passage.

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
0.29 LD tomorrow 2018 DV1 7 m  0.45 from 1.75 LD Feb. 22 - March 9 intruder today, NHATS target, Moon closest 0.35 LD at 1621 UTC
0.74 LD Feb. 25 2018 DU 8 m  3.27 to 4.23 LD Feb. 15 - March 7 intruder, NHATS target
2.29 LD Feb. 25 2018 DR 11 m  6.53 to 8.01 LD Feb. 18 - March 3 NHATS target
3.7   LD Feb. 24* 2017 DR109 10 m  8.7 to 10.2 LD Feb. 18 - today EPU +/- 30 mins.*, NHATS target, exits ten LD
3.76 LD March 7 2017 VR12 276 m  8.40 from 9.68 LD Feb. 28 - March 13 radar/NHATS target - DOU
3.87 LD today 2018 DW1 15 m  3.87 LD Feb. 25 - March 4 Earth closest at 0013 UTC
4.18 LD Feb. 27 2018 DT 13 m  4.32 to 4.50 LD Feb. 11 - March 15 NHATS target
5.09 LD tomorrow 2018 DU1 9 m  5.14 from 5.51 LD Feb. 24 - March 8 NHATS target, risk
5.44 LD Feb. 27 2018 CU14 10 m  5.65 to 5.99 LD Feb. 19 - March 8 NHATS target
6.66 LD Jan. 15 2018 AV2 6 m  9.74 to 9.87 LD Nov. 10 - tomorrow NHATS target, natural?
9.27 LD March 3 2018 DC 39 m  9.78 from 10.52 LD today - March 5 NHATS target, enters ten LD

This report was generated at 2115 UTC with follow-up in today's DOU MPEC for inbound radar target 2017 VR12.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
6.9   LD March 10* 2015 DK200 26 m  16.3 from 18.0 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
9.1   LD March 27* 2018 DH1 208 m  87.1 from 90.9 LD March 26 - 28 EPU +/- 8.45 hours*
* 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. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 1 March '18

The MPC's NEO Confirmation Page has 40 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 40 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 43 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 1 March '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.

<< DOU on 1 Mar. '18 >>  MPEC 2018-E02 - "13:05 UT" - Daily Orbit Update

MPEC 2018-E01 - "11:33 UT" - 2018 DA1

Observers  on 1 March '18

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2018-E02 -- 2018 CP14, 2018 BK7, 2018 BH6, 2018 BD6, 2017 WE2, 2016 CW31, 2009 BM2, 2007 LU19
K26Contern Obs. in Luxembourg, 1 in MPEC 2018-E02 -- 276033
W46Foxfire Village Obs., 1 in MPEC 2018-E02 -- 276033
238Grorudalen Obs. in Norway, 1 in MPEC 2018-E02 -- 2017 VR12
W08Jimginny Obs., 1 in MPEC 2018-E02 -- 276033
Z43Landehen Obs., 3 in MPEC 2018-E02 -- 2017 VR12, 475967, 1981
W87LCO Cerro Tololo C in Chile, 2 in MPEC 2018-E02 -- 506590, 234145
V37LCO Fort Davis in Texas, 1 in MPEC 2018-E02 -- 2017 VR12
Q64LCO Siding Spring B in New South Wales, 1 in MPEC 2018-E02 -- 3361
K91LCO Sutherland A in South Africa, 2 in MPEC 2018-E02 -- 506590, 234145
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-E01 -- 2018 DA1
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2018-E01 & 2018-E02 -- 2018 DA1, 2003 SV159
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2018-E02 -- 276033
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-E01 -- 2018 DA1
W884G. Gasparovic in Croatia via Chile Obs. in Chile, 1 in MPEC 2018-E02 -- 276033
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2018-E02 -- 276033
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2018-E02 -- 2016 CX264, 2016 AH8, 2015 FP118
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2018-E02 -- 2018 BL3
C51WISE in Earth polar orbit, 2 in MPEC 2018-E02 -- 508767, 496837
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 March '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.





Notes for Today's Latest Risk Assessments
2018 DU1NEODyS16222060-2118119.62e-07-7.74-7.95-NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2018-02-25.205 to 2018-02-27.202."
2018 DA1NEODyS1702R E M O V E DNEODyS #2 for the day
JPL Sentry1622R E M O V E DJPL: Risk listing removed at 1442 UTC today
2018 AT2NEODyS16222091-211532.87e-07-8.26-8.660NEODyS: "Based on 32 optical observations (of which 3 are rejected as outliers) from 2018-01-12.335 to 2018-01-20.612."

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 1 March '18

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

2115Generated Traffic Report
1702Noted that NEODyS has removed 2018 DA1 as an impact risk - see above
1622Noted that NEODyS has updated its 2018 AT2 risk assessment - see above
Noted that JPL Sentry has removed 2018 DA1 as an impact risk - see above
Noted that NEODyS has updated its 2018 DA1 risk assessment - see above
Noted that NEODyS has posted 2018 DU1 as an impact risk - see above
Grabbed MPEC 2018-E01 - 2018 DA1 - see above
Grabbed MPEC 2018-E02 - Daily Orbit Update - see above