Contents  on 2 April '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 April '15

Five objects reported inside ten LD

Five asteroids are reported passing inside ten lunar distances (LD) of Earth today. NHATS target 2015 FK120 is inbound from 7.00 to 6.45 LD and the other four are headed away. Radar target 2015 FW117 is outbound from 3.86 to 6.68 LD and 2015 FA285 from 6.92 to 8.23 LD, while intruder 2015 FM118 exits our ten-LD reporting "bubble," traveling from 9.63 to 11.58 LD, as does risk-listed 2015 FF36, moving from 9.99 to 11.86 LD.

Coming around the Sun toward us next, 2015 FN33 arrives inside ten LD on April 5th.

This report was generated at 1610 UTC with first follow-up for 2015 FA285 in today's DOU MPEC along with follow-up for 2015 FK120, 2015 FW117, 2015 FN33, and departed objects NHATS target 2015 FW33, and risk-listed 2015 DD54.

This report was updated at 1940 UTC with the discovery of already departed 2015 FQ332 which was announced in today's DOU MPEC. This risk-listed object is calculated with an initial uncertainty of plus-or-minus 2.183 hours to have passed Earth at 3.8 LD on March 4th. Today's first A/CC traffic report was posted at 1610 UTC with the first follow-up for 2015 FA285 in today's DOU along with follow-up for 2015 FK120, 2015 FW117, 2015 FN33, and departed objects NHATS target 2015 FW33, and risk-listed 2015 DD54.



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 derived 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 April '15

The MPC's NEO Confirmation Page has 88 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 88 objects listed. Of these, 48 were "one nighters." So far The Tracking News has counted a total of 96 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 April '15

Minor Planet Electronic Circulars

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


MPEC 2015-G06 - "19:01 UT" - P/1994 N2 = 2014 M6 (McNaught-Hartley)


MPEC 2015-G05 - "14:05 UT" - 2015 FS332


<< DOU on 2 Apr. '15 >>  MPEC 2015-G04 - "12:11 UT" - Daily Orbit Update

Observers  on 2 April '15

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 58 in MPECs 2015-G04 & 2015-G05 -- 2015 FY284, 2015 FV118, 2015 FS332, 2015 FS33, 2015 FQ332, 2015 FN120, 2015 FH120, 2015 FG37, 2015 FA285, 2015 EQ7, 2015 EL7, 2015 EE7, 2015 ED7, 2015 DP155, 2015 DO155, 2015 DN215, 2015 DE176, 2015 DD198, 2015 BK, 2014 WJ70, 2014 QR295, 2014 FK33, 2011 WK15, 2011 SV71, 2008 GA4, 2007 ED125, 2005 WB1, 2002 EX8, 1998 GL10, 86067, 53435, 425713, 416186, 416032, 345646, 285331, 242450, 237551, 231792, 22771, 212359, 189008, 163696, 154035, 152978, 141531, 141527, 140288, 138127, 112985, 101873, 100756, 7480, 6455, 4401, 3691, 1866, 1627
493Calar Alto Obs. in Spain, 3 in MPEC 2015-G04 -- 2015 FA118, 2015 DE198, 2015 DD198
W11Calumet Astronomy Center in Indiana, 1 in MPEC 2015-G04 -- 2014 YB35
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2015-G04 -- 2015 DO155, 2008 GA4, 380981
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2015-G04 -- 2015 DD54
448Desert Moon Obs. in New Mexico, 1 in MPEC 2015-G04 -- 2015 DP155
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2015-G04 -- 2015 FW117
203GiaGa Obs. in Italy, 3 in MPEC 2015-G04 -- 2015 FL, 2015 EZ, 2015 EE7
J95Great Shefford Obs. in England, 3 in MPEC 2015-G04 -- 2015 FW117, 2015 FB118, 2015 FA285
682Kanab Obs. in Utah, 1 in MPEC 2015-G04 -- 2015 DD198
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2015-G04 -- 2015 FW117
688&D. Avner via Lowell Obs. Anderson Mesa Station in Arizona, 5 in MPEC 2015-G04 -- 2015 FY284, 2015 FW33, 2015 FW117, 2015 FV117, 2015 FK120
K95MASTER-II Obs. Sutherland in South Africa, 1 in MPEC 2015-G06 -- P/2014 M6
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2015-G04 -- 2015 FN33, 2015 FG36
711McDonald Obs. in Texas, 3 in MPECs 2015-G04 & 2015-G05 -- 2015 FS332, 2015 BC511, 2014 VG2
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2015-G04 -- 237551, 138937
F51Pan-STARRS 1 (PS1) in Hawaii, 18 in MPECs 2015-G04, 2015-G05 & 2015-G06 -- 2015 FY284, 2015 FS332, 2015 FQ332, 2015 EL7, 2014 SR339, P/2014 M6, 2012 FB57, 2011 UW158, 2011 HB53, 2011 AM24, 2008 JQ24, 428086, 409836, 394130, 281365, 278327, 275976, 267131
A53Peschiera del Garda Obs. in Italy, 1 in MPEC 2015-G04 -- 2015 EE7
A48Povegliano Veronese Obs. in Italy, 2 in MPEC 2015-G04 -- 2015 FL, 2015 EE7
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2015-G04 -- 2008 HE
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2015-G04 & 2015-G05 -- 2015 FS332, 2015 FQ332, 2015 FP118, 2015 FL290, 2015 FG120, 2015 FD35, 2003 HG2
C51WISE in Earth polar orbit, 1 in MPEC 2015-G04 -- 2015 AY245
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2015-G04 -- 2002 EX8, 345646, 154035, 140288
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 April '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.
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
2015 FS332JPL Sentry16402024-2107195.9e-09-4.53-4.740JPL: "Analysis based on 16 observations spanning 3.7999 days (2015-Mar-29.54613 to 2015-Apr-02.346)." Diameter approximately 0.681 km. from mean, weighted H=18.5.
NEODyS16002024-2113286.86e-09-4.44-4.710NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2015-03-29.547 to 2015-04-02.347."
2015 FQ332JPL Sentry16402082-208965.1e-05-4.70-4.990JPL: "Analysis based on 9 observations spanning 3.8027 days (2015-Mar-28.54819 to 2015-Apr-01.35085)." Diameter approximately 0.030 km. from mean, weighted H=25.2.
NEODyS16402082-208952.21e-05-5.07-5.420NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2015-03-28.549 to 2015-04-01.352."
2015 FL290JPL Sentry16002082-208521.1e-06-4.70-5.000JPL: "Analysis based on 36 observations spanning 3.8971 days (2015-Mar-28.30269 to 2015-Apr-01.19976)." Diameter approximately 0.130 km. from mean, weighted H=22.0.
NEODyS16002082-208521.46e-06-4.57-4.660NEODyS: "Based on 38 optical observations (of which 1 are rejected as outliers) from 2015-03-28.303 to 2015-04-01.201."
2015 FG120JPL Sentry16002062-210346.9e-07-5.39-5.530JPL: "Analysis based on 15 observations spanning 6.9402 days (2015-Mar-25.442 to 2015-Apr-01.38215)." Diameter approximately 0.079 km. from mean, weighted H=23.2.
NEODyS16002062-210691.7e-06-5.01-5.180NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2015-03-25.443 to 2015-04-01.383."
2015 FP118JPL Sentry1600R E M O V E DJPL: Risk listing removed at 1553 UTC.
2015 DD54JPL Sentry1600211412.1e-06-6.35-6.350JPL: "Analysis based on 94 observations spanning 68.980 days (2015-Jan-20.32497 to 2015-Mar-30.304969)." Diameter approximately 0.028 km. from mean, weighted H=25.4.
NEODyS1600211419.19e-07-6.70-6.7-NEODyS: "Based on 94 optical observations (of which 0 are rejected as outliers) from 2015-01-20.326 to 2015-03-30.306."
2004 FU162NEODyS16002015-21081112.24e-06-6.71-7.490NEODyS: "Based on 4 optical observations (of which 0 are rejected as outliers) from 2004-03-31.278 to 2004-03-31.309."

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 April '15

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

1953Grabbed MPEC 2015-G06 - P/1994 N2 = 2014 M6 (McNaught-Hartley) - see above
1940Updated Traffic Report
1640Noted that JPL Sentry has posted 2015 FQ332 as an impact risk - see above
Noted that NEODyS has posted 2015 FQ332 as an impact risk - see above
Noted that JPL Sentry has posted 2015 FS332 as an impact risk - see above
1600Noted that NEODyS has updated its 2004 FU162 risk assessment - see above
Noted that JPL Sentry has updated its 2015 DD54 risk assessment - see above
Noted that NEODyS has updated its 2015 DD54 risk assessment - see above
Noted that JPL Sentry has updated its 2015 FG120 risk assessment - see above
Noted that NEODyS has updated its 2015 FG120 risk assessment - see above
Noted that JPL Sentry has updated its 2015 FL290 risk assessment - see above
Noted that NEODyS has updated its 2015 FL290 risk assessment - see above
Noted that JPL Sentry has removed 2015 FP118 as an impact risk - see above
Noted that NEODyS has posted 2015 FS332 as an impact risk - see above
Grabbed MPEC 2015-G04 - Daily Orbit Update - see above
Grabbed MPEC 2015-G05 - 2015 FS332 - see above