Contents  on 13 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 13 March '19

Eight objects reported inside ten LD

Eight minor planets are reported within ten lunar distances (LD) of Earth today. Nearest is risk-listed 2019 DJ1, which is outbound from 4.04 to 4.14 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
0.8   LD March 22* 2019 EA2 22 m  9.4 from 10.6 LD today - March 30 EPU +/- 53 mins.*, intruder, NHATS target, enters ten LD, risk - DOU
1.59 LD March 11 2019 EW1 14 m  5.19 to 7.70 LD March 7 - 14
4.04 LD yesterday 2019 DJ1 15 m  4.04 to 4.14 LD March 2 - 23 NHATS target, risk - DOU
6.46 LD March 8 2019 EF1 20 m  8.48 to 9.42 LD March 3 - 14 NHATS target
7.59 LD March 11 2019 DH 39 m  8.04 to 9.11 LD March 9 - 14
7.7   LD today* 2012 VZ19 26 m  7.7 LD March 9 - 16 EPU +/- 3.65 days*, NHATS target, Earth closest at 0623 UTC
8.52 LD March 18 2019 DH1 20 m  9.87 from 10.49 LD today - March 23 NHATS target, enters ten LD - DOU
9.02 LD March 16 2019 ES 30 m  9.72 from 10.41 LD today - March 19 NHATS target, enters ten LD
* EPU = Earth passage uncertainty

This report was generated at 2224 UTC with the discovery of departed intruder 2019 DG2, which went by us at about 0.6 LD* on February 26th. This was announced in today's DOU MPEC along with follow-up for inbound risk-listed intruder 2019 EA2, inbound 2019 DH1, outbound risk-listed 2019 DJ1, and for four departed objects: 2019 ET, 2019 EH, 2019 AR2, and risk-listed 2019 DP. We have also added to this reporting approaching 2016 GE1.

Approaching - sorted by 10-LD bubble entry date
9.69 LD March 27 2019 EN 203 m  45.87 from 49.29 LD March 26 - 27
3.9   LD April 4* 2016 GE1 16 m  49.9 from 52.2 LD March 31 - April 8 NEW, 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 13 March '19

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, ten were "one nighters."

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 13 March '19

Minor Planet Electronic Circulars

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


<< DOU on 13 Mar. '19 >>  MPEC 2019-E92 - "12:05 UT" - Daily Orbit Update

Observers  on 13 March '19

A total of 22 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2019-E92 -- 2019 EA2, 2019 CU2, 2019 CN1, 2019 AS9, 2019 AR2, 2018 XZ2, 2018 VF1, 2018 QP1, 285944
160Castelmartini Obs. in Italy, 4 in MPEC 2019-E92 -- 2007 NL1, 381677, 31210, 137802
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPEC 2019-E92 -- 2019 ES1, 2019 EJ, 2019 EH, 2019 EG, 2019 DZ, 2019 DR, 2019 DP1, 2019 DP, 2019 DO1, 2019 DG2, 2019 CV2, 2019 CT2
L34Galhassin Robotic Telescope, 5 in MPEC 2019-E92 -- 18736, 1627, 1620, 719, 433
J95Great Shefford Obs. in England, 3 in MPEC 2019-E92 -- 2019 EC2, 2019 EA2, 2019 DJ1
Q69Hazelbrook Obs., 1 in MPEC 2019-E92 -- 2002 XC91
Z32Javalambre Obs., 2 in MPEC 2019-E92 -- 25916, 2201
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 2 in MPEC 2019-E92 -- 2009 BL71, 136635
C94MASTER-II Tunka in Russia, 1 in MPEC 2019-E92 -- 267759
V01Mountainville Obs. in Utah, 1 in MPEC 2019-E92 -- 2019 CL2
474Mt. John Obs. in New Zealand, 8 in MPEC 2019-E92 -- 2019 ET, 2019 ES1, 2019 EH, 2019 EE1, 2019 DQ1, 2019 DP1, 2019 DH1, 2016 RR33
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2019-E92 -- 2019 DG2
Z80Northolt Branch Obs. in England, 1 in MPEC 2019-E92 -- 2019 DN
323Perth Obs. in Western Australia, 2 in MPEC 2019-E92 -- 18736, 1036
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2019-E92 -- 38086, 3103
L18QOS Obs., 2 in MPEC 2019-E92 -- 2019 DN, 2019 CD5
C95SATINO-1 in France, 1 in MPEC 2019-E92 -- 2007 CK26
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2019-E92 -- 2019 CL2
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2019-E92 -- 2019 DG2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-E92 -- 2019 ET1, 2019 EA2
C51WISE in Earth polar orbit, 1 in MPEC 2019-E92 -- 2019 DF2
I15Wishing Star Obs. in Rhode Island, 5 in MPEC 2019-E92 -- 2019 EQ, 2019 CE5, 2019 BF4, 2014 QR295, 18736
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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.
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
2019 EA2JPL Sentry16002036-2118570.0001157053745-4.54-4.800JPL: Computed at 08:21 today Pacific time based on 27 observations spanning 3.5501 days (2019-Mar-09.49609 to 2019-Mar-13.046167). Diameter approximately 0.022 km. from weighted mean H=25.92.
NEODyS16002036-21181011.25e-03-3.81-3.83-NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2019-03-09.497 to 2019-03-13.047."
2019 ET1JPL Sentry16002106-211521.7746e-05-5.12-5.180JPL: Computed at 07:55 today Pacific time based on 24 observations spanning 6.2575 days (2019-Mar-06.30025 to 2019-Mar-12.557748). Diameter approximately 0.034 km. from weighted mean H=24.96.
NEODyS16002106-211533.58e-04-3.82-3.820NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2019-03-06.301 to 2019-03-12.559."
2019 DF2JPL Sentry16312045-2097361.33579e-08-7.56-8.610JPL: Computed at 09:09 today Pacific time based on 10 observations spanning .98139 days (2019-Feb-18.21261 to 2019-Feb-19.194). Diameter approximately 0.051 km. from weighted mean H=24.20.
2019 DJ1JPL Sentry16002108-210817.672e-10-10.40-10.40JPL: Computed at 07:45 today Pacific time based on 80 observations spanning 393.36 days (2018-Feb-12.514671 to 2019-Mar-12.879008). Diameter approximately 0.015 km. from weighted mean H=26.73.
NEODyS1600210812.51e-07-7.92-7.920NEODyS: "Based on 80 optical observations (of which 0 are rejected as outliers) from 2018-02-12.515 to 2019-03-12.880."
2019 DPJPL Sentry16002076-2118103.99342e-06-5.72-6.010JPL: Computed at 07:53 today Pacific time based on 186 observations spanning 14.588 days (2019-Feb-26.440595 to 2019-Mar-13.02834). Diameter approximately 0.035 km. from weighted mean H=24.96.
NEODyS16002060-2118325.22e-06-5.61-5.8-NEODyS: "Based on 186 optical observations (of which 0 are rejected as outliers) from 2019-02-26.441 to 2019-03-13.029."
2008 EM68JPL Sentry16002019-211610981.08659401e-05-5.57-6.250JPL: Computed at 00:27 April 7th of 2017 Pacific time based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183). Diameter approximately 0.010 km. from weighted mean H=27.72.
2008 EL68JPL Sentry16002020-21135973.10446868e-05-5.51-6.210JPL: Computed at 11:57 April 9th of 2017 Pacific time based on 8 observations spanning .07124 days (2008-Mar-06.40768 to 2008-Mar-06.47892). Diameter approximately 0.009 km. from weighted mean H=27.92.

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 13 March '19

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

2224Generated Traffic Report
1631Noted that JPL Sentry has posted 2019 DF2 as an impact risk - see above
1600Noted that JPL Sentry has updated its 2008 EL68 risk assessment - see above
Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that JPL Sentry has updated its 2019 DJ1 risk assessment - see above
Noted that NEODyS has updated its 2019 DJ1 risk assessment - see above
Noted that JPL Sentry has updated its 2019 DP risk assessment - see above
Noted that NEODyS has updated its 2019 DP 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
Noted that JPL Sentry has updated its 2019 ET1 risk assessment - see above
Noted that NEODyS has updated its 2019 ET1 risk assessment - see above
Grabbed MPEC 2019-E92 - Daily Orbit Update - see above