Contents  on 1 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 1 March '15

Four objects reported inside ten LD

There are four visitors reported within ten lunar distances (LD) of our planet today. Inside Earth's sphere of gravitational influence (SOI), 2015 DY198 comes its closest to Earth on this passage, reaching 2.17 LD at 1123 UT, and also its closest to the Moon -- 2.31 LD at 0710 UT. Further out, newly announced 2015 DO215 is inbound from 3.69 to 3.19 LD and 2015 DS53 from 6.72 to 4.15 LD, while NHATS target 2015 DU is slowly receding, moving from 8.31 to 8.44 LD.

Coming our way next, 2015 DK200 arrives inside ten LD on March 4th.

This report was updated at 2305 UTC with new discovery 2015 DO215 (MPEC). Today's first A/CC traffic report was generated at 1536 UTC with follow-up in today's DOU MPEC for departed objects 2015 DZ198 and risk-listed 2015 DD54 along with observation from January of 2015 BL311, 2015 BF92, NHATS/radar target 2015 BE92, radar target 2015 AK45, and distant 425755 2011 CP4.

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. "Distant" is used here to describe an object that has come within ten LD since this reporting began but is not so close during the reported apparition. 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 1 March '15

The MPC's NEO Confirmation Page has 78 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 78 objects listed. Of these, 40 were "one nighters." So far The Tracking News has counted a total of 89 listings on the NEOCP today.

New MPECs  on 1 March '15

Minor Planet Electronic Circulars

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

MPEC 2015-E07 - "23:14 UT" - 2002 SL

MPEC 2015-E06 - "20:28 UT" - 2015 DO215

MPEC 2015-E05 - "17:27 UT" - 2015 DN215

MPEC 2015-E04 - "14:21 UT" - 2015 DM215

MPEC 2015-E03 - "14:03 UT" - 2015 DL215

<< DOU on 1 Mar. '15 >>  MPEC 2015-E02 - "12:05 UT" - Daily Orbit Update

MPEC 2015-E01 - "01:11 UT" - 2014 FK33

Observers  on 1 March '15

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2015-E02 -- 2015 DU198
C77Bernezzo Obs. in Italy, 1 in MPEC 2015-E04 -- 2015 DM215
300Bisei Spaceguard Center in Japan, 2 in MPECs 2015-E04 & 2015-E05 -- 2015 DN215, 2015 DM215
160Castelmartini Obs. in Italy, 4 in MPEC 2015-E02 -- 2015 BZ310, 2015 BJ514, 6053, 1627
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2015-E04, 2015-E05 & 2015-E06 -- 2015 DO215, 2015 DN215, 2015 DM215
203GiaGa Obs. in Italy, 2 in MPEC 2015-E02 -- 2015 DT, 2015 CU
J95Great Shefford Obs. in England, 4 in MPECs 2015-E03, 2015-E04, 2015-E05 & 2015-E06 -- 2015 DO215, 2015 DN215, 2015 DM215, 2015 DL215
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2015-E05 -- 2015 DN215
987Isle of Man Obs. on the Isle of Man, 1 in MPEC 2015-E02 -- 3691
Q625Cristovao Jacques in Brazil via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2015-E04 -- 2015 DM215
246KLENOT in the Czech Republic, 3 in MPECs 2015-E02, 2015-E04 & 2015-E05 -- 2015 DZ198, 2015 DN215, 2015 DM215
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2015-E07 -- 2002 SL
C41MASTER-II Obs. Kislovodsk in Russia, 1 in MPEC 2015-E05 -- 2015 DN215
C94MASTER-II Obs. Tunka in Russia, 1 in MPEC 2015-E02 -- 2014 YM9
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2015-E01 & 2015-E02 -- 2015 DD54, 2014 FK33
711McDonald Obs. in Texas, 3 in MPECs 2015-E03, 2015-E04 & 2015-E05 -- 2015 DN215, 2015 DM215, 2015 DL215
G84Mt. Lemmon SkyCenter in Arizona, 1 in MPEC 2015-E05 -- 2015 DN215
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2015-E03, 2015-E04 & 2015-E05 -- 2015 DN215, 2015 DM215, 2015 DL215
C47Nonndorf Obs. in Austria, 4 in MPECs 2015-E02, 2015-E05 & 2015-E06 -- 2015 DT, 2015 DO215, 2015 DN215, 2014 EK24
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2015-E02 -- 11066
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2015-E02 -- 2015 DD54
A48Povegliano Veronese Obs. in Italy, 4 in MPEC 2015-E02 -- 2015 DT, 2015 CA1, 2015 BK, 2014 EK24
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2015-E04 -- 2015 DM215
H36Sandlot Obs. in Kansas, 3 in MPECs 2015-E04, 2015-E05 & 2015-E06 -- 2015 DO215, 2015 DN215, 2015 DM215
204Schiaparelli Obs. in Italy, 24 in MPEC 2015-E02 -- 2015 BY310, 2015 BW92, 2015 BV4, 2015 BP4, 2015 BL311, 2015 BK311, 2015 BG92, 2015 BF92, 2015 BE92, 2015 BC92, 2015 AZ43, 2015 AW16, 2015 AK45, 2015 AA44, 2014 YW34, 2014 YV43, 2014 YU43, 2014 SF145, 2013 OS3, 2013 BZ45, 2006 SY217, 2004 BS102, 2000 BK19, 425755
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2015-E03 & 2015-E04 -- 2015 DM215, 2015 DL215
Q65Warrumbungle Obs., 1 in MPEC 2015-E05 -- 2015 DN215
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 DD54JPL Sentry1520211411.8e-06-6.40-6.400JPL: "Analysis based on 85 observations spanning 38.299 days (2015-Jan-20.32497 to 2015-Feb-27.623554)." Diameter approximately 0.028 km. from mean, weighted H=25.4.
NEODyS15202113-211425.81e-07-6.88-6.890NEODyS: "Based on 85 optical observations (of which 0 are rejected as outliers) from 2015-01-20.326 to 2015-02-27.624."

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 '15

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

2359Grabbed MPEC 2015-E07 - 2002 SL - see above
2305Updated Traffic Report
2043Grabbed MPEC 2015-E06 - 2015 DO215 - see above
1807Grabbed MPEC 2015-E05 - 2015 DN215 - see above
1520Noted that JPL Sentry has updated its 2015 DD54 risk assessment - see above
Noted that NEODyS has updated its 2015 DD54 risk assessment - see above
Grabbed MPEC 2015-E02 - Daily Orbit Update - see above
Grabbed MPEC 2015-E03 - 2015 DL215 - see above
Grabbed MPEC 2015-E04 - 2015 DM215 - see above
0158Grabbed MPEC 2015-E01 - 2014 FK33 - see above