Contents  on 6 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 6 March '17

Eleven objects reported inside ten LD

Including two newly announced discoveries, eleven asteroids are reported traveling less than ten lunar distances (LD) from our home world today. Closest is intruder 2017 DS109, which exits Earth's SOI as it moves outward from 1.37 to 3.67 LD.

Earth passage I D ~Size Distance Today  Notes
0.92 LD yesterday2017 DS109 21 m  1.37 to 3.67 LD intruder, exits Earth SOI - DOU
2.17 LD March 32017 EJ1 10 m  6.46 to 8.48 LD NEW, risk - MPEC
2.56 LD March 32017 DP109 14 m  7.61 to 10.17 LD exits ten LD, risk
2.78 LD yesterday2017 EV 15 m  2.80 to 3.59 LD DOU
4.05 LD March 102017 DA36 32 m  7.50 from 8.90 LD NHATS target - DOU
4.42 LD March 32017 EG1 11 m  5.77 to 6.73 LD NEW - MPEC
4.49 LD tomorrow2017 EW 13 m  4.74 from 6.12 LD DOU
4.87 LD yesterday2017 EJ 28 m  5.86 to 10.73 LD exits ten LD - DOU
5.35 LD March 22017 ED 18 m  6.61 to 7.33 LD NHATS target - DOU
7.43 LD tomorrow2017 EF 13 m  7.46 from 7.93 LD
9.65 LD March 82017 DV35 12 m  9.73 from 9.86 LD NHATS target

This report was updated at 2240 UTC with the discoveries of 2017 EJ1 (MPEC) and 2017 EG1 (MPEC).
        Previously this report was updated at 1949 UTC to refresh these traffic tables with new data and to note follow-up in today's DOU MPEC for five departed objects: 2017 DA38, 2017 CP32, and NHATS targets 2017 DF38, 2017 DC36, and 2017 DX34.
        Your first local minor objects traffic report was generated at 0525 UTC.

Approaching (sorted by 10-LD bubble entry date)
4.95 LD March 132017 EK 54 m  < 10 LD March 10 - 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
7.93 LD May 292017 CS 425 m  < 10 LD May 26, 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. 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 6 March '17

The MPC's NEO Confirmation Page has 71 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 71 objects listed. Of these, 43 were "one nighters." So far The Tracking News has counted a total of 95 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 6 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-E55 - "19:50 UT" - 2017 EJ1


MPEC 2017-E54 - "19:45 UT" - 2017 EH1


MPEC 2017-E53 - "19:41 UT" - 2017 EG1


<< DOU on 6 Mar. '17 >>  MPEC 2017-E52 - "13:05 UT" - Daily Orbit Update


MPEC 2017-E51 - "12:09 UT" - 2014 NA64


MPEC 2017-E50 - "12:07 UT" - 2013 SR24

Observers  on 6 March '17

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 15 in MPECs 2017-E51 & 2017-E52 -- 2017 DZ108, 2017 DY37, 2017 DX34, 2017 DW108, 2017 DU37, 2017 DT36, 2017 DP35, 2017 DL34, 2017 DF38, 2017 DD38, 2017 DA36, 2014 OY337, 2014 NA64, 2013 RM43, 2012 EC
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2017-E52 & 2017-E54 -- 2017 EW, 2017 ET, 2017 EH1
T05ATLAS Haleakala in Hawaii, 5 in MPEC 2017-E52 -- 2013 YK148, 2006 EC1, 40267, 11398, 3103
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2017-E52 -- 2011 WO41, 40267, 11398, 4179
300Bisei Spaceguard Center in Japan, 1 in MPEC 2017-E54 -- 2017 EH1
073Bucharest Obs. in Romania, 1 in MPEC 2017-E52 -- 143404
160Castelmartini Obs. in Italy, 8 in MPEC 2017-E52 -- 2016 UE101, 2013 YE38, 468583, 414960, 35396, 138846, 5131, 1627
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2017-E52 & 2017-E54 -- 2017 EH1, 2017 ED
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 24 in MPECs 2017-E51, 2017-E52 & 2017-E55 -- 2017 EL, 2017 EK, 2017 EJ1, 2017 DY35, 2017 DX37, 2017 DX34, 2017 DT37, 2017 DT35, 2017 DT15, 2017 DS35, 2017 DQ36, 2017 DL34, 2017 DK109, 2017 DE38, 2017 DD38, 2017 DA38, 2017 CP32, 2017 CO5, 2017 CO1, 2017 BL30, 2017 BE92, 2017 BC30, 2016 XZ23, 2014 NA64
J95Great Shefford Obs. in England, 3 in MPECs 2017-E52 & 2017-E53 -- 2017 EJ, 2017 EG1, 2017 DS109
Q60ISON Siding Spring Obs. in New South Wales, 3 in MPEC 2017-E52 -- 2016 SD, 153951, 7341
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-E52 -- 2017 EK
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-E52 -- 2017 EK
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2017-E53 & 2017-E54 -- 2017 EH1, 2017 EG1
C27Pallerols Obs. in Spain, 1 in MPEC 2017-E52 -- 4179
F51Pan-STARRS 1 (PS1) in Hawaii, 17 in MPECs 2017-E52 & 2017-E55 -- 2017 EJ1, 2017 DS35, 2017 CG1, 2016 VV3, 2014 KF91, 2013 LB1, 2008 EE68, 2002 FQ4, 2000 AF205, 456651, 317255, 249595, 190166, 7480, 5646, 5189, 2329
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2017-E52 -- 137158, 136582, 2329
W25RMS Obs., 7 in MPECs 2017-E52 & 2017-E54 -- 2017 EH1, 2017 DT37, 2017 DC36, 2017 DA36, 2017 CR32, 370702, 138155
679San Pedro Martir Obs. in Mexico, 1 in MPEC 2017-E52 -- 2017 DQ36
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-E52 -- 2017 DT37
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-E55 -- 2017 EJ1
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-E54 -- 2017 EH1
926Tenagra II Obs. in Arizona, 3 in MPECs 2017-E52 & 2017-E54 -- 2017 EV, 2017 EH1, 2017 DS109
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-E50 -- 2013 SR24
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2017-E52 -- 2016 UU80, 2011 WO41, 11398
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 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 EJ1JPL Sentry22102093-211641.2e-08-9.47-9.700JPL: "Analysis based on 8 observations spanning .96558 days (2017-Mar-05.55244 to 2017-Mar-06.51802)." Diameter approximately 0.010 km. from mean, weighted H=27.6.
2017 BL30NEODyS21332052-211357.06e-08-6.67-6.890NEODyS: "Based on 303 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-03-03.172."

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 6 March '17

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

2240Updated Traffic Report
2210Noted that JPL Sentry has posted 2017 EJ1 as an impact risk - see above
2133Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
2006Grabbed MPEC 2017-E53 - 2017 EG1 - see above
Grabbed MPEC 2017-E54 - 2017 EH1 - see above
Grabbed MPEC 2017-E55 - 2017 EJ1 - see above
1630Grabbed MPEC 2017-E50 - 2013 SR24 - see above
Grabbed MPEC 2017-E51 - 2014 NA64 - see above
Grabbed MPEC 2017-E52 - Daily Orbit Update - see above