Contents  on 2 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 2 March '17

Eight objects reported inside ten LD

The nearest of eight minor objects known to be flying within ten lunar distances (LD) of Earth today is near indeed. Newly announced tiny risk-listed intruder 2017 EA was caught at 0733 UTC zooming in from 2.30 LD to pass us at 0.054 LD at 1404 UTC, following which it buzzed the Moon at 0.87 LD at 1659 UTC, and will end the day out at 1.63 LD from our planet. This is within the top nine closest passages observed by telescope that didn't end in Earth impact.

Earth passage I D ~Size Distance Today  Notes
0.05 LD today2017 EA 3 m  0.05 LD NEW, intruder today, risk, Earth closest at 1404 UTC, Moon closest 0.87 LD at 1659 UTC - MPEC
0.36 LD Feb. 232017 DG16 4 m  8.99 to 10.46 LD exits ten LD, intruder, NHATS target, risk
1.02 LD Feb. 272017 DV36 9 m  7.00 to 9.38 LD
3.58 LD Feb. 242017 CP1 40 m  6.68 to 7.55 LD radar/NHATS target - DOU
4.07 LD Feb. 282017 DJ16 23 m  4.89 to 6.60 LD
4.68 LD today2012 DR32 41 m  4.68 LD Earth closest at 1929 - DOU
7.29 LD Feb. 272017 DA38 35 m  8.68 to 9.71 LD DOU
7.43 LD Feb. 282017 DS37 12 m  7.81 to 8.27 LD NHATS target

This report was updated at 2314 UTC to update these traffic tables and to note that the DOU carried follow-up for departed 2017 DD36, 2017 DV15, and NHATS target 2017 DC36, plus astrometry from early/mid-February for departed radar target 2017 BY93 and NHATS targets 2017 BS5 and 2017 AG5, along with follow-up for distant 2007 DT103. We also note that JPL is showing unobserved passages in the last ten years for two recent discoveries: NHATS target 2017 DS37 is calculated to have passed at 7.7 LD in March 2007 with +/- 2.82 hours uncertainty, and departed NHATS target 2017 DF38 went by at 2.4 LD in August 2015 (+/- 37 minutes uncertainty).
        This report was previously updated at 1812 UTC with the discovery of 2017 EA (MPEC) and to note follow-up in today's DOU MPEC for objects in the tables here and for numerous departed objects, for which we are in the process of updating data from JPL.
        Your first neighboring asteroids traffic report was generated at 0520 UTC, when we noted that radar observation mostly from early February was posted yesterday for now departed objects 2017 BQ6, NHATS target 2017 BW, and 2013 FK.

Approaching (sorted by 10-LD bubble entry date)
9.64 LD March 82017 DV35 12 m  < 10 LD March 5, NHATS target - DOU
4.05 LD March 102017 DA36 33 m  < 10 LD March 5, NHATS target - DOU
8.34 LD March 161998 SL36 309 m  < 10 LD March 14, radar target
7.63 LD March 262015 TC25 4 m  < 10 LD March 17, radar/NHATS target, risk
4.57 LD April 192014 JO25 812 m  < 10 LD April 18, radar target
7.9   LD May 292017 CS 430 m  < 10 LD May 26, uncertainty +/- 17 mins., radar target



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 within ten LD since A/CC began these traffic reports (2007) but is not now so close. 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.

Radar Astrometry  on 2 March '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0027 UTC when the database was dated 1 March

NEOCP Activity  on 2 March '17

The MPC's NEO Confirmation Page has 77 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 77 objects listed. Of these, 44 were "one nighters." So far The Tracking News has counted a total of 82 listings on the NEOCP today.

New MPECs  on 2 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-E20 - "21:27 UT" - Comet C/2017 C1 (Neowise)


MPEC 2017-E19 - "21:22 UT" - Comet C/2017 B3 (LINEAR)


MPEC 2017-E18 - "21:09 UT" - Comet C/2017 A3 (Elenin)


MPEC 2017-E17 - "20:26 UT" - 2015 QR3


<< DOU on 2 Mar. '17 >>  MPEC 2017-E16 - "13:18 UT" - Daily Orbit Update


MPEC 2017-E15 - "12:39 UT" - 2017 EA

Observers  on 2 March '17

A total of 40 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2017-E16 -- 2017 CH1, 2016 YU8, 2016 YO, 2016 OK1, 2013 DQ9, 90075, 481381, 370307, 315020, 310842, 141018, 7888, 4179
W97Atacama Desert Obs. in Chile, 1 in MPEC 2017-E18 -- C/2017 A3
T05ATLAS Haleakala in Hawaii, 2 in MPECs 2017-E18 & 2017-E19 -- C/2017 B3, C/2017 A3
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-E16 -- 2012 DR32
V03Big Water Obs. in Utah, 1 in MPEC 2017-E16 -- 2016 XD1
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2017-E18 -- C/2017 A3
215Buchloe Obs. in Germany, 2 in MPECs 2017-E19 & 2017-E20 -- C/2017 C1, C/2017 B3
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2017-E16 -- 2017 BL30
160Castelmartini Obs. in Italy, 3 in MPEC 2017-E16 -- 2016 VY5, 42286, 3352
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2017-E15 & 2017-E16 -- 2017 EA, 2017 BM123, 141018, 138359
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-E16 -- 2016 TK
A77Chante-Perdrix Obs. in France, 1 in MPEC 2017-E19 -- C/2017 B3
Z45Cosmos Obs., 1 in MPEC 2017-E16 -- 2017 DC36
006Fabra Obs. in Spain, 5 in MPEC 2017-E16 -- 90075, 54789, 40267, 138155, 11398
E85Farm Cove Obs. in New Zealand, 1 in MPEC 2017-E18 -- C/2017 A3
372Geisei Obs. in Japan, 1 in MPEC 2017-E18 -- C/2017 A3
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2100
H15ISON New Mexico Obs. in New Mexico, 3 in MPECs 2017-E16 & 2017-E18 -- C/2017 A3, 374038, 3552
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-E20 -- C/2017 C1
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-E18 -- C/2017 A3
Q626Erik Bryssinck in Belgium via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-E19 -- C/2017 B3
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2017-E18 & 2017-E19 -- C/2017 B3, C/2017 A3
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-E15 -- 2017 EA
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-E16 -- 138155
900Moriyama Obs. in Japan, 1 in MPEC 2017-E18 -- C/2017 A3
474Mt. John Obs. in New Zealand, 9 in MPECs 2017-E15 & 2017-E16 -- 2017 EA, 2017 DX37, 2017 DQ36, 2017 DE38, 2017 DD, 2017 DC36, 2017 BL30, 2017 BC30, 2017 AO13
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2017-E15 & 2017-E16 -- 2017 EA, 2017 DD36, 2017 DC36, 2016 WX9
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2017-E16 -- 3103
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2017-E18 -- C/2017 A3
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 35 in MPEC 2017-E16 -- 2017 DR15, 2017 DC36, 2017 DA36, 2017 AC5, 2016 UU80, 2013 YK148, 2013 VC13, 2012 DR32, 2011 WO41, 2008 ER7, 2005 EY223, 2004 BD68, 2002 LS32, 2002 EM6, 2000 CE59, 90075, 54789, 443103, 40267, 370702, 347813, 317255, 310842, 22753, 152931, 138155, 13651, 11398, 10636, 10165, 5693, 5131, 4179, 3352, 1036
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2017-E16 -- 2016 QC84, 2011 QP96, 388838, 7480
Q11Shinshiro Obs., 1 in MPEC 2017-E18 -- C/2017 A3
W883B. Lutkenhoner in Germany via Slooh.com Chile Obs. in Chile, 2 in MPECs 2017-E18 & 2017-E19 -- C/2017 B3, C/2017 A3
G45Space Surveillance Telescope Atom Site in New Mexico, 1 in MPEC 2017-E16 -- 2017 DV15
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2017-E15 & 2017-E16 -- 2017 EA, 2017 CH1, 2016 XH2, 2016 VZ18
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2017-E16 -- 2017 DQ36, 2017 DD38, 2017 BL30, 2017 BF30, 2010 GA7, 2010 BK2, 2007 DT103, 2000 JA3
I52Steward Obs. Mt. Lemmon Station in Arizona, 12 in MPEC 2017-E16 -- 2017 DW37, 2017 DV35, 2017 DR35, 2017 DP34, 2017 DO36, 2017 DO34, 2017 DL34, 2017 DJ34, 2017 DF38, 2017 DB36, 2017 DA38, 2017 BK3
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-E19 -- C/2017 B3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPECs 2017-E16 & 2017-E17 -- 2015 QR3, 2015 BN311
718Wiggins Obs. in Utah, 1 in MPEC 2017-E15 -- 2017 EA
C51WISE in Earth polar orbit, 4 in MPEC 2017-E16 -- 2008 CM20, 53319, 345646, 152931
754Yerkes Obs. in Wisconsin, 23 in MPEC 2017-E16 -- 2017 DR15, 2017 CP1, 2017 BY93, 2017 BU6, 2017 BU31, 2017 BS5, 2017 BM123, 2017 BL30, 2017 BL3, 2017 BK3, 2017 BD29, 2017 AZ13, 2017 AG5, 2017 AF5, 2016 YU10, 2016 YM1, 2016 YF11, 2016 XQ23, 2016 XM, 2016 WR48, 2016 VQ5, 2016 UU80, 2016 QN11
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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 EAJPL Sentry16282046-206631.4e-06-8.19-8.250JPL: "Analysis based on 59 observations spanning .17912 days (2017-Mar-02.31463 to 2017-Mar-02.49375)." Diameter approximately 0.003 km. from mean, weighted H=30.6.
2017 DD38NEODyS16282113-211623.25e-09-8.44-8.480NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2017-02-25.495 to 2017-02-28.930."
2017 DQ36JPL Sentry16282021-2097103.1e-07-2.68-2.800JPL: "Analysis based on 34 observations spanning 7.8796 days (2017-Feb-22.23938 to 2017-Mar-02.11896)." Diameter approximately 0.493 km. from mean, weighted H=19.2.
2017 BL30NEODyS18372052-211146.88e-08-6.70-6.810NEODyS: "Based on 292 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-03-02.228."
JPL Sentry1628R E M O V E DJPL: Risk listing removed at 1613 UTC.
2008 EK68JPL Sentry05052017-21153145.0e-06-7.61-8.870JPL: "Analysis based on 10 observations spanning .04006 days (2008-Mar-05.4406 to 2008-Mar-05.48066)." Diameter approximately 0.004 km. from mean, weighted H=29.8.

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 March '17

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

2314Updated Traffic Report
2131Grabbed MPEC 2017-E18 - Comet C/2017 A3 (Elenin) - see above
Grabbed MPEC 2017-E19 - Comet C/2017 B3 (LINEAR) - see above
Grabbed MPEC 2017-E20 - Comet C/2017 C1 (Neowise) - see above
2103Grabbed MPEC 2017-E17 - 2015 QR3 - see above
1837Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
1628Noted that JPL Sentry has removed 2017 BL30 as an impact risk - see above
Noted that NEODyS has updated its 2017 DD38 risk assessment - see above
Noted that JPL Sentry has updated its 2017 DQ36 risk assessment - see above
Noted that JPL Sentry has posted 2017 EA as an impact risk - see above
Grabbed MPEC 2017-E15 - 2017 EA - see above
Grabbed MPEC 2017-E16 - Daily Orbit Update - see above
0505Noted that JPL Sentry has updated its 2008 EK68 risk assessment - see above
0027Noted Radar Astrometry database update - see above