Contents  on 21 March '17

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 21 March '17

Seven objects reported inside ten LD

Today there are seven visitors traveling within ten lunar distances (LD) of our planet. The two nearest are newly announced intruders that began the day inside the Earth-Moon system -- 2017 FM1 at 0.36 LD and risk-listed 2017 FN1 at 0.53 LD -- and will end outside of Earth's sphere of gravitational influence. They flew by Earth at 0.33 and 0.16 LD yesterday.

Earth passage I D ~Size Distance Today  Notes
0.16 LD yesterday2017 FN1 3 m  0.53 to 4.54 LD NEW, intruder, exits Earth SOI, risk - MPEC
0.28 LD March 192017 FS 5 m  8.29 to 12.76 LD intruder, exits ten LD
0.33 LD yesterday2017 FM1 4 m  0.36 to 2.45 LD NEW, intruder, exits Earth SOI, Moon closest 1.16 LD at 0050 UTC - MPEC
1.74 LD yesterday2017 FK 11 m  2.06 to 3.74 LD exits Earth SOI, NHATS target - DOU
1.98 LD today2017 FJ 8 m  1.98 LD NHATS target, Earth closest at 1501 UTC, Moon closest 1.56 LD at 2146 UTC - DOU
4.38 LD March 172017 EG3 18 m  7.89 to 9.48 LD NHATS target
7.63 LD March 262015 TC25 4 m  8.34 from 8.65 LD radar/NHATS target, risk
Approaching
4.57 LD April 192014 JO25 812 m  < 10 LD April 18, radar target
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU
9.08 LD April 22017 FV 47 m  < 10 LD March 31, risk - DOU

This report was generated at 1837 UTC with new discoveries 2017 FN1 (MPEC) and 2017 FM1 (MPEC), and with follow-up in today's DOU MPEC for four objects in the traffic table here, for departed NHATS target 2017 DC36, and for two departed objects that JPL is showing also flew past us undiscovered in recent years: 2017 FW at around 3.2 LD (large uncertainty) in October 2011, and NHATS target 2017 FR at about 9.2 LD (some uncertainty) in September 2015.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant 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 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 21 March '17

The MPC's NEO Confirmation Page has 133 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 133 objects listed. Of these, 60 were "one nighters." So far The Tracking News has counted a total of 135 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 21 March '17

Minor Planet Electronic Circulars

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


MPEC 2017-F51 - "15:28 UT" - 2015 SA17


MPEC 2017-F50 - "14:21 UT" - 2014 VQ


MPEC 2017-F49 - "14:19 UT" - 2012 HN13


<< DOU on 21 Mar. '17 >>  MPEC 2017-F48 - "12:04 UT" - Daily Orbit Update


MPEC 2017-F47 - "02:26 UT" - 2017 FN1


MPEC 2017-F46 - "02:23 UT" - 2017 FM1

Observers  on 21 March '17

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 6 in MPEC 2017-F48 -- 2017 ER2, 2017 EJ3, 2017 ED3, 2017 EB3, 2017 DX15, 2017 DU37
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPEC 2017-F48 -- 2017 EU, 2017 EL, 2017 DW35, 2017 DR15, 2017 CS, 2017 CR32, 2017 CO5, 2017 BU31, 2017 BG85, 2017 AC5, 2016 YP4, 2010 UD, 2008 EY68, 2007 BX48, 54789, 40267, 143404, 10636, 5604, 3552, 2329
T05ATLAS Haleakala in Hawaii, 22 in MPEC 2017-F48 -- 2017 DT37, 2017 CR32, 2017 AC5, 90075, 388838, 370702, 370307, 317255, 274138, 252091, 250620, 248083, 175189, 144861, 143404, 138155, 137158, 10636, 5626, 5604, 4055, 2329
T08ATLAS Mauna Loa in Hawaii, 16 in MPEC 2017-F48 -- 2017 CR32, 2017 AC5, 90075, 413002, 388838, 317255, 250620, 22771, 143404, 10636, 5626, 5604, 4954, 4055, 1864, 1036
160Castelmartini Obs. in Italy, 9 in MPEC 2017-F48 -- 54789, 483656, 40267, 248083, 10636, 5131, 4179, 3352, 3103
703Catalina Sky Survey (CSS) in Arizona, 24 in MPECs 2017-F46 & 2017-F48 -- 2017 FM1, 2017 DS35, 2017 CR32, 2010 UD, 2008 EY68, 2006 UM, 2006 EC1, 485652, 485051, 484795, 484517, 483459, 40267, 388838, 163696, 154652, 138359, 137158, 13651, 10636, 5693, 5189, 4179, 4055
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 14 in MPECs 2017-F48, 2017-F49, 2017-F50 & 2017-F51 -- 2017 FW, 2017 FU, 2017 FR, 2017 FP, 2017 ER2, 2017 ER13, 2017 EH4, 2017 BS6, 2017 BL6, 2017 BL32, 2016 WX9, 2015 SA17, 2014 VQ, 2012 HN13
006Fabra Obs. in Spain, 3 in MPEC 2017-F48 -- 90075, 10636, 5604
W46Foxfire Village Obs., 1 in MPEC 2017-F48 -- 143404
J95Great Shefford Obs. in England, 3 in MPECs 2017-F46, 2017-F47 & 2017-F48 -- 2017 FN1, 2017 FM1, 2017 FJ
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-F48 -- 154144
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-F48 -- 2017 CS
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-F48 -- 12538
G96Mt. Lemmon Survey (MLS) in Arizona, 19 in MPECs 2017-F46, 2017-F47 & 2017-F48 -- 2017 FN1, 2017 FM1, 2015 BE513, 2014 HD3, 2013 CL118, 2003 XV10, 2003 FR6, 1996 FS1, 99935, 484725, 483662, 474451, 381906, 226198, 154652, 143404, 5836, 5693, 3103
J69North Obs. in England, 1 in MPEC 2017-F48 -- 2017 CR32
Z80Northolt Branch Obs. in England, 3 in MPEC 2017-F48 -- 2017 CR32, 2017 AC5, 138155
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2017-F48 -- 2017 FV, 2017 EN, 2014 GD45, 65803, 474451, 235086, 154652, 7341, 2329
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 19 in MPEC 2017-F48 -- 2017 EC, 2017 DC36, 2017 CS, 2017 CR32, 2017 AC5, 2016 DP, 90075, 89830, 54789, 485652, 40267, 370702, 317255, 250620, 11398, 10636, 5604, 4179, 3352
W25RMS Obs., 8 in MPEC 2017-F48 -- 2017 FK, 2017 FJ, 2017 EN, 2017 DT37, 2017 AC5, 370702, 154652, 138155
K14Sencelles Obs. in Spain, 1 in MPEC 2017-F48 -- 2017 CR32
W54Slade Remote Obs., 1 in MPEC 2017-F48 -- 143404
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-F48 -- 2016 QC84
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2017-F48 -- 2010 GA7, 1996 FS1
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-F48 -- 143404
926Tenagra II Obs. in Arizona, 9 in MPEC 2017-F48 -- 2017 FW, 2017 FT, 2017 FP, 2017 FJ, 2017 FH, 2017 ES2, 2017 ER22, 2017 EN, 2017 DT37
C51WISE in Earth polar orbit, 1 in MPEC 2017-F48 -- 2013 EW27
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 March '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL 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 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
2017 FN1NEODyS17102033-207283.87e-04-5.45-5.470NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2017-03-20.357 to 2017-03-20.821."
JPL Sentry04552033-207273.1e-04-5.57-5.600JPL: "Analysis based on 13 observations spanning .46422 days (2017-Mar-20.356 to 2017-Mar-20.820223)." Diameter approximately 0.003 km. from mean, weighted H=30.6.
2017 FC1NEODyS1710206412.1e-05-5.10-5.10NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2017-03-18.209 to 2017-03-20.222."
2017 FB1NEODyS17102071-2117325.23e-06-4.39-4.950NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2017-03-18.208 to 2017-03-20.254."
2017 FVJPL Sentry16002100-2116156.1e-06-5.13-5.510JPL: "Analysis based on 22 observations spanning 3.0666 days (2017-Mar-17.26524 to 2017-Mar-20.33186)." Diameter approximately 0.043 km. from mean, weighted H=24.5.
2017 EB23NEODyS1710208913.7e-10-9.62-9.620NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2017-03-02.380 to 2017-03-07.049."
2017 DC120NEODyS17102024-2117262.76e-08-5.99-6.170NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2017-02-28.580 to 2017-03-01.857."
2017 DB120NEODyS17102039-206553.82e-09-7.39-7.490NEODyS: "Based on 8 optical observations (of which 0 are rejected as outliers) from 2017-02-25.440 to 2017-02-27.844."

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 21 March '17

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

1837Generated Traffic Report
1710Noted that NEODyS has posted 2017 DB120 as an impact risk - see above
Noted that NEODyS has posted 2017 DC120 as an impact risk - see above
Noted that NEODyS has posted 2017 EB23 as an impact risk - see above
Noted that NEODyS has posted 2017 FB1 as an impact risk - see above
Noted that NEODyS has posted 2017 FC1 as an impact risk - see above
Noted that NEODyS has posted 2017 FN1 as an impact risk - see above
1600Noted that JPL Sentry has updated its 2017 FV risk assessment - see above
Grabbed MPEC 2017-F48 - Daily Orbit Update - see above
Grabbed MPEC 2017-F49 - 2012 HN13 - see above
Grabbed MPEC 2017-F50 - 2014 VQ - see above
Grabbed MPEC 2017-F51 - 2015 SA17 - see above
0455Noted that JPL Sentry has posted 2017 FN1 as an impact risk - see above
Grabbed MPEC 2017-F46 - 2017 FM1 - see above
Grabbed MPEC 2017-F47 - 2017 FN1 - see above