Contents  on 11 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 11 March '19

Seven objects reported inside ten LD

Seven small celestial objects are reported within ten lunar distances (LD) of Earth today. Nearest is newly announced 2019 EW1, which is inside our planet's SOI as it comes its closest on this passage, reaching 1.59 LD, and its closest to the Moon -- 1.74 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
1.59 LD today 2019 EW1 14 m  1.59 LD March 7 - 14 NEW, Earth closest at 0205 UTC, Moon closest
1.74 LD at 0830 UTC - MPEC, DOU
2.04 LD March 8 2019 EU 25 m  6.78 to 9.04 LD March 4 - 12 DOU
2.72 LD March 6 2019 EU1 26 m  7.83 to 9.31 LD Feb. 28 - tomorrow
5.18 LD March 8 2019 EB2 22 m  8.79 to 11.28 LD March 5 - 11 NEW, exits ten LD - MPEC
6.46 LD March 8 2019 EF1 20 m  7.02 to 7.66 LD March 3 - 14 NHATS target
7.59 LD today 2019 DH 39 m  7.59 LD March 9 - 14 Earth closest at 2101 UTC
7.7   LD March 13* 2012 VZ19 26 m  8.0 from 8.7 LD March 9 - 16 EPU +/- 3.65 days*, NHATS target
* EPU = Earth passage uncertainty

This report was generated at 1950 UTC with four discoveries: approaching risk-listed intruder 2019 EA2 (MPEC, DOU), passing 2019 EW1 (MPEC, DOU), outbound 2019 EB2 (MPEC), and already departed 2019 EZ1 (MPEC), which flew by us at 8.64 LD on March 4th. Today's DOU MPEC has follow-up for approaching 2019 ES, outbound 2019 EU, and seven departed objects: 2019 ET, 2015 EG, and including five risk-listed -- 2019 ED1, 2019 EF, 2019 DS1, 2019 DG1, and 2019 CJ4, plus astrometry from January-February for 2019 CT4 and 2019 AR2.

Approaching - sorted by 10-LD bubble entry date
0.8   LD March 22* 2019 EA2 22 m  11.7 from 12.8 LD March 13 - 30 NEW, EPU +/- 3.73 hours*, intruder, risk - MPEC, DOU
9.02 LD March 16 2019 ES 30 m  11.28 from 12.29 LD March 13 - 19 NHATS target - DOU
8.52 LD March 18 2019 DH1 20 m  11.18 from 11.94 LD March 13 - 23 NHATS target
9.69 LD March 27 2019 EN 206 m  52.73 from 56.20 LD March 26 - 27



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 11 March '19

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, seventeen 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 11 March '19

Minor Planet Electronic Circulars

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


<< DOU on 11 Mar. '19 >>  MPEC 2019-E85 - "13:04 UT" - Daily Orbit Update


MPEC 2019-E84 - "10:33 UT" - 2019 EB2


MPEC 2019-E83 - "10:28 UT" - 2019 EA2


MPEC 2019-E82 - "10:22 UT" - 2019 EZ1


MPEC 2019-E81 - "00:49 UT" - 2019 EW1

Observers  on 11 March '19

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 7 in MPEC 2019-E85 -- 2019 DN, 2019 CD5, 2014 QR295, 2005 YY36, 2005 FC3, 18736, 5131
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2019-E85 -- 2019 EG
160Castelmartini Obs. in Italy, 9 in MPEC 2019-E85 -- 2019 AR2, 2011 OL5, 99799, 523604, 457260, 163051, 141053, 138937, 1943
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2019-E81, 2019-E82 & 2019-E84 -- 2019 EZ1, 2019 EW1, 2019 EB2
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPECs 2019-E81, 2019-E82, 2019-E83 & 2019-E85 -- 2019 EZ1, 2019 EW1, 2019 EA2, 2019 CM4, 2018 XH
203GiaGa Obs. in Italy, 2 in MPECs 2019-E81 & 2019-E82 -- 2019 EZ1, 2019 EW1
J95Great Shefford Obs. in England, 4 in MPECs 2019-E81, 2019-E82, 2019-E83, 2019-E84 & 2019-E85 -- 2019 EZ1, 2019 EW1, 2019 EB2, 2019 EA2
130Lumezzane Obs. in Italy, 10 in MPEC 2019-E85 -- 2019 CE5, 2016 EO84, 2009 DL1, 2009 BL71, 468684, 458198, 453778, 376864, 31210, 4596
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2019-E83 & 2019-E84 -- 2019 EB2, 2019 EA2
J69North Obs. in England, 1 in MPEC 2019-E85 -- 2019 DN
D29Purple Mtn. Obs. Xuyi Station in China, 8 in MPEC 2019-E85 -- 2005 YY36, 85275, 356285, 32906, 238063, 178871, 1917, 1862
H36Sandlot Obs. in Kansas, 3 in MPECs 2019-E82, 2019-E84 & 2019-E85 -- 2019 EZ1, 2019 EB2, 2019 EA2
C95SATINO-1 in France, 2 in MPECs 2019-E82 & 2019-E85 -- 2019 EZ1, 9162
204Schiaparelli Obs. in Italy, 14 in MPECs 2019-E81, 2019-E82 & 2019-E85 -- 2019 EZ1, 2019 EW1, 2019 EU, 2019 ET, 2019 ES, 2019 EQ, 2019 DC, 2019 CZ4, 2019 CW, 2019 CT4, 2019 CE5, 2019 CE, 2015 EG, 523799
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-E85 -- 2019 DN
587Sormano Obs. in Italy, 2 in MPECs 2019-E82 & 2019-E84 -- 2019 EZ1, 2019 EB2
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2019-E85 -- 2019 AH11, 2015 BY310
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPECs 2019-E81, 2019-E82 & 2019-E84 -- 2019 EZ1, 2019 EW1, 2019 EB2
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 7 in MPEC 2019-E85 -- 2019 EF, 2019 ED1, 2019 DW1, 2019 DS1, 2019 DG1, 2019 CM4, 2019 CJ4
L01Visnjan Obs., 3 in MPECs 2019-E81, 2019-E82 & 2019-E83 -- 2019 EZ1, 2019 EW1, 2019 EA2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 Sentry16302036-21181520.0008502902172-3.38-3.450JPL: Computed at 08:56 today Pacific time based on 20 observations spanning 1.9462 days (2019-Mar-09.49609 to 2019-Mar-11.44228). Diameter approximately 0.022 km. from weighted mean H=25.93.
NEODyS16302036-21182647.11e-04-3.43-3.77-NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2019-03-09.497 to 2019-03-11.443."
2019 ED1JPL Sentry16302070-2109151.82285e-05-6.15-6.850JPL: Computed at 08:39 today Pacific time based on 39 observations spanning 5.0470 days (2019-Mar-05.23495 to 2019-Mar-10.28191). Diameter approximately 0.011 km. from weighted mean H=27.51.
NEODyS16302070-2111351.66e-05-6.20-6.80NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2019-03-05.236 to 2019-03-10.283."
2019 EFJPL Sentry16302051-205122.12e-07-7.07-7.280JPL: Computed at 08:32 today Pacific time based on 57 observations spanning 8.1474 days (2019-Mar-01.37381 to 2019-Mar-09.521184). Diameter approximately 0.016 km. from weighted mean H=26.60.
NEODyS16302051-210356.32e-07-6.69-6.940NEODyS: "Based on 57 optical observations (of which 0 are rejected as outliers) from 2019-03-01.375 to 2019-03-09.522."
2019 DW1JPL Sentry1630R E M O V E DJPL: Risk listing removed at 1529 UTC today
NEODyS16302082-208822.17e-09-8.29-8.50NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2019-02-28.217 to 2019-03-09.242."
2019 DS1JPL Sentry16302069-2114280.00016499075-4.25-4.530JPL: Computed at 08:36 today Pacific time based on 83 observations spanning 9.5514 days (2019-Feb-28.38268 to 2019-Mar-09.934092). Diameter approximately 0.025 km. from weighted mean H=25.66.
NEODyS16302069-2115421.34e-04-4.36-4.630NEODyS: "Based on 83 optical observations (of which 0 are rejected as outliers) from 2019-02-28.383 to 2019-03-09.935."
2019 DG1JPL Sentry16302118-211812.902e-06-6.77-6.770JPL: Computed at 08:29 today Pacific time based on 55 observations spanning 9.3929 days (2019-Feb-28.23445 to 2019-Mar-09.627392). Diameter approximately 0.016 km. from weighted mean H=26.66.
NEODyS16302098-211841.5e-06-7.07-7.22-NEODyS: "Based on 57 optical observations (of which 1 are rejected as outliers) from 2019-02-28.235 to 2019-03-09.628."
2019 CM4NEODyS16302115-211738.74e-09-7.41-7.450NEODyS: "Based on 143 optical observations (of which 0 are rejected as outliers) from 2019-02-08.398 to 2019-03-10.157."
2019 CJ4JPL Sentry16302075-2116131.534848e-06-6.32-6.820JPL: Computed at 08:34 today Pacific time based on 70 observations spanning 29.082 days (2019-Feb-08.36766 to 2019-Mar-09.449681). Diameter approximately 0.028 km. from weighted mean H=25.44.
NEODyS16302075-2116232.65e-06-6.09-6.590NEODyS: "Based on 70 optical observations (of which 0 are rejected as outliers) from 2019-02-08.368 to 2019-03-09.450."
2008 EL68JPL Sentry16302019-21135983.13232868e-05-5.47-6.210JPL: 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=27.91.

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 11 March '19

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

1950Generated Traffic Report
1630Noted that JPL Sentry has updated its 2008 EL68 risk assessment - see above
Noted that JPL Sentry has updated its 2019 CJ4 risk assessment - see above
Noted that NEODyS has updated its 2019 CJ4 risk assessment - see above
Noted that NEODyS has updated its 2019 CM4 risk assessment - see above
Noted that JPL Sentry has updated its 2019 DG1 risk assessment - see above
Noted that NEODyS has updated its 2019 DG1 risk assessment - see above
Noted that JPL Sentry has updated its 2019 DS1 risk assessment - see above
Noted that NEODyS has updated its 2019 DS1 risk assessment - see above
Noted that JPL Sentry has removed 2019 DW1 as an impact risk - see above
Noted that NEODyS has updated its 2019 DW1 risk assessment - see above
Noted that JPL Sentry has posted 2019 EA2 as an impact risk - see above
Noted that NEODyS has posted 2019 EA2 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 ED1 risk assessment - see above
Noted that NEODyS has updated its 2019 ED1 risk assessment - see above
Noted that JPL Sentry has updated its 2019 EF risk assessment - see above
Noted that NEODyS has updated its 2019 EF risk assessment - see above
Grabbed MPEC 2019-E82 - 2019 EZ1 - see above
Grabbed MPEC 2019-E83 - 2019 EA2 - see above
Grabbed MPEC 2019-E84 - 2019 EB2 - see above
Grabbed MPEC 2019-E85 - Daily Orbit Update - see above
0102Grabbed MPEC 2019-E81 - 2019 EW1 - see above