Contents  on 20 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 20 March '17

Five objects reported inside ten LD

There are five known asteroids reported within ten lunar distances (LD) of Earth today. Nearest is 2017 FK, which is inside our planet's SOI and comes its closest to us this time around, reaching 1.74 LD at 1159 UTC, and also its closest to the Moon -- 1.89 LD at 1329 UTC.

Earth passage I D ~Size Distance Today  Notes
0.28 LD yesterday2017 FS 5 m  3.82 to 8.29 LD intruder
1.74 LD today2017 FK 11 m  1.74 LD Earth closest at 1159 UTC, Moon closest 1.89 LD at 1329 UTC
1.98 LD tomorrow2017 FJ 8 m  2.37 from 3.92 LD enters Earth SOI
4.38 LD March 172017 EG3 18 m  6.43 to 7.89 LD NHATS target
7.63 LD March 262015 TC25 4 m  8.65 from 9.01 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 432 m  < 10 LD May 26, radar target - DOU
9.1   LD April 22017 FV 46 m  < 10 LD March 31, uncertainty +/- 34 mins., risk

This report was generated at 1846 UTC with follow-up in today's DOU MPEC for large approaching radar target 2017 CS along with follow-up for three departed objects: 2017 FW, 2017 FR, and NHATS target 2017 DC36. The DOU also reports the discoveries of four now-departed objects: 2017 ED23, which went by at about 6.5 LD on March 1st, 2017 EA23 -- 6.94 LD March 6th, 2017 DY199 -- roughly 6.95 LD February 13th, and 2017 DX199 -- 2.27 LD February 18th, plus, from observation last September, the recovery of distant 2016 FY3.



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. "Distant" is used here to describe an object that has come inside ten LD in the last ten years but was not so close at the time of reported observation. 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 20 March '17

The MPC's NEO Confirmation Page has 92 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 92 objects listed. Of these, 50 were "one nighters." So far The Tracking News has counted a total of 110 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 20 March '17

Minor Planet Electronic Circulars

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


MPEC 2017-F45 - "21:11 UT" - 2017 FK1


MPEC 2017-F44 - "21:08 UT" - 2017 FE1


MPEC 2017-F43 - "20:58 UT" - 2017 FY


MPEC 2017-F42 - "19:34 UT" - 2017 FL1


MPEC 2017-F41 - "19:31 UT" - 2017 FJ1


MPEC 2017-F40 - "19:28 UT" - 2017 FH1


MPEC 2017-F39 - "19:24 UT" - 2017 FG1


MPEC 2017-F38 - "19:21 UT" - 2017 FF1


MPEC 2017-F37 - "19:17 UT" - 2017 FD1


MPEC 2017-F36 - "19:13 UT" - 2017 FC1


MPEC 2017-F35 - "19:10 UT" - 2017 FB1


MPEC 2017-F34 - "19:07 UT" - 2017 FA1


MPEC 2017-F33 - "19:03 UT" - 2017 FZ


MPEC 2017-F32 - "18:59 UT" - 2017 FX


MPEC 2017-F31 - "18:55 UT" - 2017 EE23


<< DOU on 20 Mar. '17 >>  MPEC 2017-F30 - "12:04 UT" - Daily Orbit Update

Observers  on 20 March '17

A total of 38 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-F31 -- 2017 EE23
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPECs 2017-F30, 2017-F37, 2017-F40 & 2017-F42 -- 2017 FL1, 2017 FH1, 2017 FD1, 2017 EX2, 2017 EH4, 2017 EC, 2017 EB3, 2017 DR15, 2017 DC36, 2017 CR32, 2017 AP20, 2017 AC5, 2008 EY68, 2006 UM, 370307, 326683, 25916, 250620, 154652, 143404, 138155, 10636, 5693, 5626, 5604, 4179, 4055, 2329
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2017-F30 -- 2003 OV, 443103, 153951, 138846, 7341, 4954, 1864, 1036
T08ATLAS Mauna Loa in Hawaii, 6 in MPECs 2017-F30 & 2017-F37 -- 2017 FD1, 2006 UM, 485652, 40267, 11398, 4179
C77Bernezzo Obs. in Italy, 2 in MPECs 2017-F37 & 2017-F42 -- 2017 FL1, 2017 FD1
300Bisei Spaceguard Center in Japan, 2 in MPECs 2017-F37 & 2017-F44 -- 2017 FE1, 2017 FD1
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2017-F32 -- 2017 FX
703Catalina Sky Survey (CSS) in Arizona, 27 in MPECs 2017-F30, 2017-F37, 2017-F42 & 2017-F43 -- 2017 FY, 2017 FL1, 2017 FD1, 2017 EN, 2017 CR32, 2017 AC5, 2011 QP96, 2009 FR30, 2008 EY68, 2002 FQ4, 2000 EM26, 1998 HK1, 405427, 388838, 370307, 274138, 252091, 175189, 144861, 143404, 138155, 5626, 5604, 4954, 3552, 2329, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2017-F30 -- 2017 EV2, 2017 EN
958Dax Obs. in France, 1 in MPEC 2017-F37 -- 2017 FD1
U69.program code "." (23) via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-F37 -- 2017 FD1
J87La Canada Obs. in Spain, 3 in MPECs 2017-F36, 2017-F37 & 2017-F44 -- 2017 FE1, 2017 FD1, 2017 FC1
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-F30 -- 2017 DC120
K92LCOGT Sutherland B in South Africa, 3 in MPEC 2017-F30 -- 2017 EB23, 2017 DW119, 2017 DB120
Z21LCOGT Tenerife Aqawan A#1 in the Canary Islands, 1 in MPEC 2017-F31 -- 2017 EE23
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2017-F30, 2017-F32, 2017-F33, 2017-F34, 2017-F42 & 2017-F43 -- 2017 FZ, 2017 FY, 2017 FX, 2017 FL1, 2017 FA1, 2017 ED23, 2017 DX119
C94MASTER-II Tunka in Russia, 2 in MPEC 2017-F30 -- 54789, 5131
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPEC 2017-F30 -- 2017 DY119, 2017 DA120
932McCarthy Obs. in Connecticut, 1 in MPEC 2017-F42 -- 2017 FL1
474Mt. John Obs. in New Zealand, 2 in MPECs 2017-F30 & 2017-F39 -- 2017 FG1, 2017 DX119
G96Mt. Lemmon Survey (MLS) in Arizona, 41 in MPECs 2017-F30, 2017-F33, 2017-F34, 2017-F35, 2017-F36, 2017-F37, 2017-F38, 2017-F39, 2017-F41, 2017-F43 & 2017-F44 -- 2017 FZ, 2017 FY, 2017 FJ1, 2017 FG1, 2017 FF1, 2017 FE1, 2017 FD1, 2017 FC1, 2017 FB1, 2017 FA1, 2017 EU, 2017 ED23, 2017 EB23, 2017 EA23, 2017 DX119, 2017 DC36, 2017 DC109, 2017 CN32, 2017 BK123, 2016 WF9, 2016 VV3, 2016 TY92, 2006 JZ25, 88213, 474451, 405427, 391033, 388838, 381906, 370702, 363505, 361532, 288914, 190758, 186823, 18109, 154715, 5604, 4179, 1943, 887
F51Pan-STARRS 1 (PS1) in Hawaii, 48 in MPECs 2017-F30, 2017-F31, 2017-F32, 2017-F38, 2017-F39, 2017-F40, 2017-F41, 2017-F42 & 2017-F45 -- 2017 FX, 2017 FL1, 2017 FK1, 2017 FJ1, 2017 FH1, 2017 FG1, 2017 FF1, 2017 EX2, 2017 EQ13, 2017 EE23, 2017 DY119, 2017 DT15, 2017 DS35, 2017 DC38, 2017 DB120, 2017 DA120, 2017 BL123, 2016 WF9, 2016 TK, 2006 JZ25, 2003 XV10, 2002 FQ4, 2000 EM26, 88213, 85490, 85275, 485823, 483560, 432226, 370307, 317212, 281365, 277810, 274138, 261938, 249595, 186823, 17274, 152671, 143404, 137158, 136582, 7358, 5646, 5189, 4954, 1864, 719
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 22 in MPEC 2017-F30 -- 2017 EC, 2017 CS, 2017 AC5, 2016 DP, 2013 RM43, 2013 OE, 90075, 54789, 485652, 40267, 370702, 347813, 317255, 250620, 248083, 143404, 11398, 10636, 5604, 5131, 4179, 3352
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-F30 -- 2017 DC120
W25RMS Obs., 4 in MPECs 2017-F36, 2017-F37, 2017-F42 & 2017-F43 -- 2017 FY, 2017 FL1, 2017 FD1, 2017 FC1
L04ROASTERR-1 in Romania, 2 in MPECs 2017-F37 & 2017-F42 -- 2017 FL1, 2017 FD1
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-F31 -- 2017 EE23
B74Santa Maria de Montmagastrell Obs. in Spain, 2 in MPECs 2017-F37 & 2017-F42 -- 2017 FL1, 2017 FD1
204Schiaparelli Obs. in Italy, 2 in MPECs 2017-F31 & 2017-F37 -- 2017 FD1, 2017 EE23
G45Space Surveillance Telescope Atom Site in New Mexico, 1 in MPEC 2017-F30 -- 2017 DW119
691Spacewatch 0.9m telescope in Arizona, 12 in MPECs 2017-F30, 2017-F32, 2017-F34, 2017-F35, 2017-F36, 2017-F40, 2017-F43 & 2017-F44 -- 2017 FY, 2017 FX, 2017 FQ, 2017 FH1, 2017 FE1, 2017 FC1, 2017 FB1, 2017 FA1, 2015 BY310, 2014 NB39, 2008 EY68, 2003 RC2
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2017-F30, 2017-F31, 2017-F32, 2017-F34, 2017-F35, 2017-F40, 2017-F42 & 2017-F45 -- 2017 FX, 2017 FL1, 2017 FK1, 2017 FH1, 2017 FB1, 2017 FA1, 2017 EE23, 2017 EB23, 2017 AQ20, 2015 FS332, 2012 EY11, 2006 DX
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-F30 -- 7088
I93St. Pardon de Conques Obs. in France, 5 in MPECs 2017-F31, 2017-F32, 2017-F36, 2017-F37 & 2017-F44 -- 2017 FX, 2017 FE1, 2017 FD1, 2017 FC1, 2017 EE23
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-F30 -- 2017 DX119
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-F37 -- 2017 FD1
926Tenagra II Obs. in Arizona, 15 in MPECs 2017-F30, 2017-F31, 2017-F33, 2017-F36, 2017-F37, 2017-F40, 2017-F42 & 2017-F44 -- 2017 FZ, 2017 FW, 2017 FT, 2017 FR, 2017 FQ, 2017 FO, 2017 FL1, 2017 FH1, 2017 FE1, 2017 FD1, 2017 FC1, 2017 EN4, 2017 EN, 2017 EE23, 2017 DC36
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-F30 -- 2016 FY3, 2016 AX165
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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 FC1JPL Sentry2135206411.6e-05-5.22-5.220JPL: "Analysis based on 29 observations spanning 2.0136 days (2017-Mar-18.20785 to 2017-Mar-20.22141)." Diameter approximately 0.025 km. from mean, weighted H=25.7.
2017 FB1JPL Sentry21352080-2117266.0e-06-4.35-4.890JPL: "Analysis based on 20 observations spanning 2.0460 days (2017-Mar-18.20739 to 2017-Mar-20.25336)." Diameter approximately 0.076 km. from mean, weighted H=23.2.
2017 FVNEODyS15462084-2117352.42e-06-5.45-6.170NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2017-03-17.266 to 2017-03-19.323."
2017 EA23JPL Sentry1546211028.0e-10-9.93-10.20JPL: "Analysis based on 12 observations spanning 2.0294 days (2017-Mar-02.3659 to 2017-Mar-04.39529)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
2017 DC120JPL Sentry17432020-21171231.8e-07-5.01-5.280JPL: "Analysis based on 8 observations spanning 1.2764 days (2017-Feb-28.5795 to 2017-Mar-01.855851)." Diameter approximately 0.101 km. from mean, weighted H=22.6.
2017 DB120JPL Sentry15462049-2103121.3e-08-6.85-7.440JPL: "Analysis based on 8 observations spanning 2.4044 days (2017-Feb-25.4388 to 2017-Feb-27.84325)." Diameter approximately 0.084 km. from mean, weighted H=23.0.
2017 DA120JPL Sentry17032024-203123.2e-10-6.65-6.770JPL: "Analysis based on 6 observations spanning .92827 days (2017-Feb-24.51232 to 2017-Feb-25.44059)." Diameter approximately 0.230 km. from mean, weighted H=20.9.
2017 DW119JPL Sentry15462023-2114482.5e-06-5.98-6.350JPL: "Analysis based on 7 observations spanning 2.7217 days (2017-Feb-22.13339 to 2017-Feb-24.855131)." Diameter approximately 0.017 km. from mean, weighted H=26.5.

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 20 March '17

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

2135Noted that JPL Sentry has posted 2017 FB1 as an impact risk - see above
Noted that JPL Sentry has posted 2017 FC1 as an impact risk - see above
Grabbed MPEC 2017-F43 - 2017 FY - see above
Grabbed MPEC 2017-F44 - 2017 FE1 - see above
Grabbed MPEC 2017-F45 - 2017 FK1 - see above
2004Grabbed MPEC 2017-F41 - 2017 FJ1 - see above
Grabbed MPEC 2017-F42 - 2017 FL1 - see above
1930Grabbed MPEC 2017-F33 - 2017 FZ - see above
Grabbed MPEC 2017-F34 - 2017 FA1 - see above
Grabbed MPEC 2017-F35 - 2017 FB1 - see above
Grabbed MPEC 2017-F36 - 2017 FC1 - see above
Grabbed MPEC 2017-F37 - 2017 FD1 - see above
Grabbed MPEC 2017-F38 - 2017 FF1 - see above
Grabbed MPEC 2017-F39 - 2017 FG1 - see above
Grabbed MPEC 2017-F40 - 2017 FH1 - see above
1904Grabbed MPEC 2017-F32 - 2017 FX - see above
1900Grabbed MPEC 2017-F31 - 2017 EE23 - see above
1846Generated Traffic Report
1743Noted that JPL Sentry has posted 2017 DC120 as an impact risk - see above
1703Noted that JPL Sentry has posted 2017 DA120 as an impact risk - see above
1546Noted that JPL Sentry has posted 2017 DB120 as an impact risk - see above
Noted that JPL Sentry has posted 2017 DW119 as an impact risk - see above
Noted that JPL Sentry has posted 2017 EA23 as an impact risk - see above
Noted that NEODyS has posted 2017 FV as an impact risk - see above
Grabbed MPEC 2017-F30 - Daily Orbit Update - see above