Contents  on 2 March '15

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 2 March '15

Four objects reported inside ten LD

There are four transient natural objects reported within ten lunar distances (LD) of our planet today. NHATS target 2015 DO215 comes its closest to Earth on this passage, reaching 3.07 LD at 1734 UT, as does 2015 DS53, coming to 3.12 LD at 2025 UT, while the other two objects are both headed away from us. 2015 DY198 is outbound from 2.89 to 5.97 LD and NHATS target 2015 DU from 8.44 to 8.58 LD.

Approaching our neighborhood next, 2015 DK200 comes inside ten LD on March 4th.

This report was generated at 1644 UTC with follow-up in today's DOU MPEC for 2015 DS53 and departed objects 2015 CM13 and risk-listed NHATS target 2015 CT13.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but puts a focus on transient natural objects that have recently approached the actually significant gravitational sphere of influence (SOI), which has a radius of about 2.41 LD from Earth's center, and thus also puts a focus on some of the most important and very best NEO observation work. Object distances are interpreted 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 2 March '15

The MPC's NEO Confirmation Page has 77 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 77 objects listed. Of these, 39 were "one nighters." So far The Tracking News has counted a total of 82 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 2 March '15

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2015-E12 - "15:05 UT" - 2015 DR215

<< DOU on 2 Mar. '15 >>  MPEC 2015-E11 - "12:27 UT" - Daily Orbit Update

MPEC 2015-E10 - "11:44 UT" - 2003 LN6

MPEC 2015-E09 - "02:49 UT" - Comet C/2015 D5 (Kowalski)

MPEC 2015-E08 - "02:25 UT" - Comet C/2015 D4 (Borisov)

Observers  on 2 March '15

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 1 in MPEC 2015-E11 -- 2015 DN215
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2015-E10 -- 2003 LN6
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2015-E11 & 2015-E12 -- 2015 DR215, 2015 AN45, 2015 AC45, 2014 YV34
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2015-E09 -- C/2015 D5
203GiaGa Obs. in Italy, 1 in MPEC 2015-E09 -- C/2015 D5
511Haute Provence Obs. in Germany, 1 in MPEC 2015-E11 -- 2015 DS53
L96ISON-Byurakan Obs., 1 in MPEC 2015-E08 -- C/2015 D4
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 2 in MPECs 2015-E08 & 2015-E09 -- C/2015 D5, C/2015 D4
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 2 in MPEC 2015-E11 -- 2014 JG78, 2012 KJ18
L51MARGO, 1 in MPEC 2015-E08 -- C/2015 D4
K95MASTER-II Obs. Sutherland in South Africa, 1 in MPEC 2015-E11 -- 68348
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPEC 2015-E11 -- 2015 DU180, 2015 DA200, 2015 CT13
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2015-E12 -- 2015 DR215
711McDonald Obs. in Texas, 6 in MPECs 2015-E09 & 2015-E11 -- 2015 DZ53, 2015 DJ198, C/2015 D5, 2015 CM13, 2015 BV515, 2015 BD515
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2015-E09 -- C/2015 D5
J50Nordic Near-Earth-Object Network, 1 in MPEC 2015-E11 -- 2002 SL
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2015-E11 & 2015-E12 -- 2015 DR215, 2015 DE176, 2013 NX, 2010 FF7, 137802, 101873
Y00SONEAR Obs. in Brazil, 1 in MPEC 2015-E11 -- 159686
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 March '15

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 JPL NEO Program Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2015 DU180JPL Sentry1620R E M O V E DJPL: Risk listing removed at 1517 UTC.
NEODyS1620R E M O V E D-
2015 CT13NEODyS1620210931.4e-07-7.72-7.920NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2015-02-13.515 to 2015-02-27.596."
JPL Sentry1620R E M O V E DJPL: Risk listing removed at 1510 UTC.
99942 Apophis (2004 MN4)JPL Sentry18002060-2105128.9e-06-2.83-2.930JPL: "Analysis based on 13 radar delay, 7 Doppler, and 4147 optical observations spanning 3635.5 days (2004-Mar-15.126289 to 2014-Feb-26.64670)." Diameter approximately 0.370 km. from mean, weighted H=19.1.
2003 LN6JPL Sentry1831R E M O V E DJPL: Risk listing removed at 1823 UTC.

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 2 March '15

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

1831Noted that JPL Sentry has removed 2003 LN6 as an impact risk - see above
1800Noted that JPL Sentry has updated its 99942 Apophis (2004 MN4) risk assessment - see above
1644Generated Traffic Report
1620Noted that JPL Sentry has removed 2015 CT13 as an impact risk - see above
Noted that NEODyS has updated its 2015 CT13 risk assessment - see above
Noted that JPL Sentry has removed 2015 DU180 as an impact risk - see above
Noted that NEODyS has removed 2015 DU180 as an impact risk - see above
Grabbed MPEC 2015-E10 - 2003 LN6 - see above
Grabbed MPEC 2015-E11 - Daily Orbit Update - see above
Grabbed MPEC 2015-E12 - 2015 DR215 - see above
0500Grabbed MPEC 2015-E08 - Comet C/2015 D4 (Borisov) - see above
Grabbed MPEC 2015-E09 - Comet C/2015 D5 (Kowalski) - see above