Contents  on 31 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 31 March '15

Seven objects reported inside ten LD

Seven asteroidal objects are reported within ten lunar distances (LD) of our planet today. Newly announced 2015 FA285 comes its closest to Earth this time around, reaching 6.37 LD at 2218 UT, and radar target 2015 FW117 is inbound from 7.88 to 4.55 LD and NHATS target 2015 FK120 from 8.42 to 7.66 LD, while the other four are all headed away. Intruder 2015 FM118 is outbound from 5.74 to 7.68 LD, NHATS target 2015 FT117 from 5.98 to 8.15 LD, risk-listed 2015 FF36 from 6.46 to 8.18 LD, and NHATS target 2015 FC from 7.40 to 8.96 LD.

Up next, 2015 FN33 arrives inside ten LD on April 5th.

This report was generated at 1637 UTC with new discovery 2015 FA285 (MPEC) and with first follow-up for 2015 FK120 and 2015 FW117 in today's DOU MPEC along with follow-up for 2015 FF36, and departed NHATS target 2015 FW33.



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 31 March '15

The MPC's NEO Confirmation Page has 97 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 97 objects listed. Of these, 52 were "one nighters." So far The Tracking News has counted a total of 104 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 31 March '15

Minor Planet Electronic Circulars

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


MPEC 2015-F164 - "14:42 UT" - 2013 AY52


MPEC 2015-F163 - "14:22 UT" - 2015 FL290


MPEC 2015-F162 - "14:04 UT" - 2015 FK290


<< DOU on 31 Mar. '15 >>  MPEC 2015-F161 - "12:05 UT" - Daily Orbit Update


MPEC 2015-F160 - "01:25 UT" - 2015 FA285


MPEC 2015-F159 - "01:01 UT" - Comet C/2015 F4 (Jacques)

Observers  on 31 March '15

A total of 33 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPECs 2015-F160, 2015-F161, 2015-F162 & 2015-F163 -- 2015 FW33, 2015 FS33, 2015 FQ, 2015 FL290, 2015 FL, 2015 FK290, 2015 FG37, 2015 FE36, 2015 FB118, 2015 FA285, 2015 EQ7, 2015 EL7, 2015 EE7, 2015 DP155, 2015 DO155, 2015 DN215, 2015 BK, 2014 WJ70, 53435, 163696, 1036
I47Auger Obs. in Argentina, 1 in MPEC 2015-F159 -- C/2015 F4
C77Bernezzo Obs. in Italy, 2 in MPEC 2015-F161 -- 2015 FL, 2015 EE7
B88Bigmuskie Obs. in Italy, 1 in MPEC 2015-F161 -- 2015 FW117
300Bisei Spaceguard Center in Japan, 1 in MPEC 2015-F160 -- 2015 FA285
493Calar Alto Obs. in Spain, 4 in MPEC 2015-F161 -- 2015 FK120, 2015 FH120, 2015 FC34, 2015 DE176
W96Campo Catino Austral Obs. in Chile, 1 in MPEC 2015-F159 -- C/2015 F4
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2015-F160 & 2015-F163 -- 2015 FL290, 2015 FA285
G58Chabot Obs. in northern California, 1 in MPEC 2015-F163 -- 2015 FL290
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2015-F159 -- C/2015 F4
I48El Catalejo Obs. in Argentina, 1 in MPEC 2015-F159 -- C/2015 F4
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPEC 2015-F161 -- 2015 DN215, 2013 ED28, 2002 GM2
006Fabra Obs. in Spain, 2 in MPEC 2015-F161 -- 189008, 3691
D90`Kevin Hills in England via iTelescope Obs. Moorook in South Australia, 1 in MPEC 2015-F161 -- 2015 FW117
Q620Ernesto Guido in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2015-F159 -- C/2015 F4
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2015-F159 -- C/2015 F4
Q622Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2015-F159 -- C/2015 F4
Q623Rolando Ligustri in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2015-F159 -- C/2015 F4
Q625Cristovao Jacques in Brazil via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2015-F159 -- C/2015 F4
Q626Erik Bryssinck in Belgium via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2015-F159 -- C/2015 F4
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2015-F159 -- C/2015 F4
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2015-F159 -- C/2015 F4
844Los Molinos Obs. in Uruguay, 1 in MPEC 2015-F159 -- C/2015 F4
K38M57 Obs. in Italy, 1 in MPEC 2015-F161 -- 2015 EE7
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2015-F163 -- 2015 FL290
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2015-F164 -- 2013 AY52
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2015-F161 & 2015-F163 -- 2015 FX117, 2015 FL290
F51Pan-STARRS 1 (PS1) in Hawaii, 15 in MPECs 2015-F161, 2015-F162 & 2015-F163 -- 2015 FT118, 2015 FL290, 2015 FK290, 2015 FF36, 2012 FB57, 2011 SV71, 2008 JQ24, 2007 FS35, 2002 GM2, 363626, 278327, 159504, 152564, 141531, 112985
W95Panamanian San Pedro Atacama Obs. in Chile, 1 in MPEC 2015-F161 -- 2002 GM2
W98Polonia Obs. in Chile, 1 in MPEC 2015-F159 -- C/2015 F4
K61Rokycany Obs. in the Czech Republic, 4 in MPEC 2015-F161 -- 2015 FW117, 2015 FV117, 2015 FL, 2015 EE7
H36Sandlot Obs. in Kansas, 1 in MPEC 2015-F160 -- 2015 FA285
C95SATINO-1 in France, 1 in MPEC 2015-F161 -- 23183
G403Tony Evans in Portugal via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2015-F161 -- 2014 YM9
Y00SONEAR Obs. in Brazil, 1 in MPEC 2015-F159 -- C/2015 F4
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2015-F161, 2015-F162 & 2015-F163 -- 2015 FQ117, 2015 FL290, 2015 FK290, 2015 FA118
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2015-F161 -- 2015 FA35
718Wiggins Obs. in Utah, 1 in MPEC 2015-F161 -- 2015 FW117
C51WISE in Earth polar orbit, 2 in MPEC 2015-F161 -- 2015 FH120, 153195
754Yerkes Obs. in Wisconsin, 1 in MPEC 2015-F163 -- 2015 FL290
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 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.
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 FL290JPL Sentry16102082-208539.0e-07-4.76-5.040JPL: "Analysis based on 33 observations spanning 3.1538 days (2015-Mar-28.30269 to 2015-Mar-31.45653)." Diameter approximately 0.140 km. from mean, weighted H=22.0.
NEODyS15472082-208531.14e-06-4.66-4.930NEODyS: "Based on 35 optical observations (of which 1 are rejected as outliers) from 2015-03-28.303 to 2015-03-31.457."
2015 FF36JPL Sentry15472072-211251.8e-06-6.71-6.940JPL: "Analysis based on 51 observations spanning 12.569 days (2015-Mar-14.349115 to 2015-Mar-26.918529)." Diameter approximately 0.017 km. from mean, weighted H=26.5.
NEODyS15472104-210723.75e-08-8.45-8.530NEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2015-03-14.350 to 2015-03-26.919."

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 31 March '15

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

1637Generated Traffic Report
1610Noted that JPL Sentry has posted 2015 FL290 as an impact risk - see above
1547Noted that JPL Sentry has updated its 2015 FF36 risk assessment - see above
Noted that NEODyS has updated its 2015 FF36 risk assessment - see above
Noted that NEODyS has posted 2015 FL290 as an impact risk - see above
Grabbed MPEC 2015-F161 - Daily Orbit Update - see above
Grabbed MPEC 2015-F162 - 2015 FK290 - see above
Grabbed MPEC 2015-F163 - 2015 FL290 - see above
Grabbed MPEC 2015-F164 - 2013 AY52 - see above
0427Grabbed MPEC 2015-F159 - Comet C/2015 F4 (Jacques) - see above
Grabbed MPEC 2015-F160 - 2015 FA285 - see above