Contents  on 16 March '19

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 March '19

Seven objects reported inside ten LD

Seven small celestial objects are reported within ten lunar distances (LD) of our home world today. Nearest is risk-listed 2019 DJ1, which is outbound from 4.80 to 5.30 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
0.80 LD March 22 2019 EA2 22 m  5.96 from 7.11 LD March 13 - 30 intruder, NHATS target, risk - DOU
2.48 LD March 11 2019 EL2 18 m  6.60 to 8.00 LD March 5 - 18 NHATS target
4.04 LD March 12 2019 DJ1 15 m  4.80 to 5.30 LD March 2 - 23 NHATS target, risk
4.48 LD March 14 2019 EF2 24 m  5.04 to 6.14 LD March 10 - 19 NHATS target
7.7   LD March 13* 2012 VZ19 26 m  9.2 to 10.2 LD March 9 - 16 EPU +/- 3.65 days*, NHATS target, exits ten LD
8.52 LD March 18 2019 DH1 20 m  8.68 from 8.96 LD March 13 - 23 NHATS target
9.02 LD today 2019 ES 30 m  9.02 LD March 13 - 19 NHATS target, Earth closest at 0743 UTC
* EPU = Earth passage uncertainty

This report was generated at 1850 UTC with follow-up in today's DOU MPEC for inbound risk-listed intruder 2019 EA2 and departed risk-listed 2019 DM1.

Approaching - sorted by 10-LD bubble entry date
4.7   LD March 23* 2019 EK2 10 m  13.1 from 14.8 LD March 18 - 28 EPU +/- 25 mins.*, NHATS target
9.69 LD March 27 2019 EN 203 m  35.78 from 39.11 LD March 26 - 27
3.9   LD April 4* 2016 GE1 16 m  42.9 from 45.2 LD March 31 - April 8 EPU +/- 4.90 days*

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 16 March '19

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 29 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 March '19

Minor Planet Electronic Circulars

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

MPEC 2019-F04 - "22:40 UT" - 2019 BC1

MPEC 2019-F03 - "22:37 UT" - 2018 JD2

MPEC 2019-F02 - "22:33 UT" - 2009 ME10

<< DOU on 16 Mar. '19 >>  MPEC 2019-F01 - "12:04 UT" - Daily Orbit Update

Observers  on 16 March '19

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2019-F01 -- 88263
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPEC 2019-F01 -- 2002 JD109, 2002 AA2
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2019-F01 -- 2019 EC2, 2019 DN, 2019 CH, 2019 AP3
807.Scott Sheppard via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2019-F02 -- 2009 ME10
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2019-F01 -- 2019 EA2, 2018 YW2
K91LCO Sutherland A in South Africa, 1 in MPEC 2019-F01 -- 2008 HS3
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2019-F04 -- 2019 BC1
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2019-F01, 2019-F02, 2019-F03 & 2019-F04 -- 2019 BC1, 2018 WP2, 2018 JD2, 2017 XC, 2015 FJ, 2014 OJ392, 2013 OD4, 2009 ME10
323Perth Obs. in Western Australia, 2 in MPEC 2019-F01 -- 2019 ED2, 2019 AP3
D29Purple Mtn. Obs. Xuyi Station in China, 5 in MPEC 2019-F01 -- 85236, 387816, 163696, 141525, 5332
C95SATINO-1 in France, 1 in MPEC 2019-F01 -- 2009 DL1
G40!M. Kumrucu-Lohmiller in Massachusetts via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-F01 -- 2019 EA2
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2019-F01 -- 2019 EA2, 2008 EY68
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-F01 -- 2019 DM1
718Wiggins Obs. in Utah, 1 in MPEC 2019-F01 -- 2019 CD5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 March '19

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 and NEODyS listings is 100 years, and both post impact solutions beyond that for some 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
2019 EA2JPL Sentry17002070-2118120.000109584957-4.84-4.980JPL: Computed at 07:48 today Pacific time based on 43 observations spanning 6.9702 days (2019-Mar-09.49609 to 2019-Mar-16.46628). Diameter approximately 0.022 km. from weighted mean H=25.89.
NEODyS17002057-2116301.22e-03-3.82-3.950NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2019-03-09.497 to 2019-03-16.467."
2019 DM1JPL Sentry17002072-209132.2425e-07-8.06-8.300JPL: Computed at 07:33 today Pacific time based on 46 observations spanning 9.1671 days (2019-Feb-28.39873 to 2019-Mar-09.565787). Diameter approximately 0.008 km. from weighted mean H=28.06.
NEODyS17002072-210039.74e-07-7.36-7.360NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2019-02-28.400 to 2019-03-09.567."
2018 YW2JPL Sentry17002069-206914.436e-07-6.02-6.020JPL: Computed at 07:32 today Pacific time based on 72 observations spanning 73.997 days (2018-Dec-31.52399 to 2019-Mar-15.52116). Diameter approximately 0.053 km. from weighted mean H=24.02.
NEODyS17002069-208623.05e-07-6.21-6.240NEODyS: "Based on 73 optical observations (of which 0 are rejected as outliers) from 2018-12-31.525 to 2019-03-15.522."

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 March '19

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

2309Grabbed MPEC 2019-F03 - 2018 JD2 - see above
Grabbed MPEC 2019-F04 - 2019 BC1 - see above
2235Grabbed MPEC 2019-F02 - 2009 ME10 - see above
1850Generated Traffic Report
1700Noted that JPL Sentry has updated its 2018 YW2 risk assessment - see above
Noted that NEODyS has updated its 2018 YW2 risk assessment - see above
Noted that JPL Sentry has updated its 2019 DM1 risk assessment - see above
Noted that NEODyS has updated its 2019 DM1 risk assessment - see above
Noted that JPL Sentry has updated its 2019 EA2 risk assessment - see above
Noted that NEODyS has updated its 2019 EA2 risk assessment - see above
Grabbed MPEC 2019-F01 - Daily Orbit Update - see above