Contents  on 5 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 5 March '17

Thirteen objects reported inside ten LD

With the addition of two new discoveries, there are thirteen Solar-System small bodies known to be moving within ten lunar distances (LD) of our planet today. Nearest by far is intruder 2017 DS109, which comes in from 1.79 LD to flit past us at 0.92 LD at 1428 UTC, and ends the day out at 1.37 LD. Along the way it passes the Moon at 1.47&nsbsp;LD at 1024 UTC.

Earth passage I D ~Size Distance Today  Notes
0.05 LD March 22017 EA 3 m  9.44 to 13.35 LD exits ten LD, intruder, risk
0.92 LD today2017 DS109 22 m  0.92 LD intruder today, Earth closest at 1428 UTC, Moon closest 1.47 LD at 1024 UTC
2.56 LD March 32017 DP109 14 m  5.17 to 7.61 LD risk
2.78 LD today2017 EV 15 m  2.78 LD NEW, Earth closest at 1933 UTC - MPEC
3.58 LD Feb. 242017 CP1 40 m  9.36 to 10.28 LD exits ten LD, radar/NHATS target
4.05 LD March 102017 DA36 32 m  8.90 from 10.36 LD enters ten LD, NHATS target - DOU
4.50 LD March 72017 EW 14 m  6.13 from 8.15 LD NEW - MPEC
4.68 LD March 22012 DR32 41 m  9.38 to 12.73 LD exits ten LD - DOU
4.87 LD today2017 EJ 28 m  4.87 LD Earth closest at 1137 UTC
5.35 LD March 22017 ED 18 m  6.02 to 6.61 LD NHATS target - DOU
7.43 LD March 72017 EF 13 m  7.93 from 8.91 LD DOU
7.43 LD Feb. 282017 DS37 12 m  9.59 to 10.41 LD exits ten LD, NHATS target
9.65 LD March 82017 DV35 12 m  9.86 from 10.06 LD enters ten LD, NHATS target

This report was updated at 1944 UTC with the discovery of 2017 EW (MPEC) and 2017 EV (MPEC), and to refresh our active traffic tables following today's DOU MPEC, which also carried the recovery of distant 357439 2004 BL86 and follow-up for departed NHATS targets 2017 DX34 and 2017 DC36.
        Your first local flying rocks traffic report was generated at 0542 UTC.
        We note that JPL is showing that departed 2017 DR109, which flew past us ten days ago at 2.32 LD, also went by at about 7.6 LD in February of last year, and has a return passage booked for next February at about 3.7 LD. With discovery announced yesterday, this object is already fading beyond the reach of most amateur NEO telescopes.

Approaching (sorted by 10-LD bubble entry date)
4.95 LD March 132017 EK 55 m  < 10 LD March 10
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. "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 that close this time around. 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 5 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, 56 were "one nighters." So far The Tracking News has counted a total of 85 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 5 March '17

Minor Planet Electronic Circulars

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


MPEC 2017-E49 - "23:01 UT" - 2016 QM44


MPEC 2017-E48 - "22:59 UT" - 2015 LK21


MPEC 2017-E47 - "15:55 UT" - 2017 EW


MPEC 2017-E46 - "15:50 UT" - 2017 EV


MPEC 2017-E45 - "15:45 UT" - 2017 EU


MPEC 2017-E44 - "15:39 UT" - 2017 ET


<< DOU on 5 Mar. '17 >>  MPEC 2017-E43 - "13:05 UT" - Daily Orbit Update

Observers  on 5 March '17

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2017-E43 -- 2017 EH, 2017 EF, 2017 DU37, 2017 DT15, 2017 DE38, 2017 DC36, 2017 CN32, 2017 AC5, 2016 VQ5, 2016 QC84, 2003 WW87, 1993 UD, 357439, 277473, 161995
T05ATLAS Haleakala in Hawaii, 16 in MPEC 2017-E43 -- 2017 DC36, 2017 AC5, 2013 YK148, 2002 LS32, 2002 EM6, 475665, 388838, 370702, 370307, 143404, 141018, 136635, 10636, 5626, 4055, 2329
T08ATLAS Mauna Loa in Hawaii, 16 in MPECs 2017-E43 & 2017-E45 -- 2017 EU, 2017 DC36, 2017 DA36, 2016 SD, 2008 CA6, 2002 EM6, 2000 CE59, 413002, 370702, 22771, 143404, 138155, 5626, 4055, 3552, 3199
R58Beverly-Begg Obs., 1 in MPEC 2017-E43 -- 193178
300Bisei Spaceguard Center in Japan, 2 in MPECs 2017-E43 & 2017-E46 -- 2017 EV, 2017 ED
073Bucharest Obs. in Romania, 1 in MPEC 2017-E43 -- 143404
215Buchloe Obs. in Germany, 1 in MPEC 2017-E43 -- 2012 DR32
160Castelmartini Obs. in Italy, 1 in MPEC 2017-E43 -- 3102
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2017-E43 & 2017-E46 -- 2017 EV, 2017 BU6, 2017 AP20, 2009 DE47, 138359
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 22 in MPECs 2017-E43, 2017-E45, 2017-E48 & 2017-E49 -- 2017 EU, 2017 DY35, 2017 DX37, 2017 DX34, 2017 DT37, 2017 DT35, 2017 DT15, 2017 DS36, 2017 DQ36, 2017 DE38, 2017 DC38, 2017 DB38, 2017 CN32, 2017 BZ6, 2017 BW32, 2017 BL123, 2017 BE92, 2017 AH13, 2017 AC5, 2016 VY5, 2016 QM44, 2015 LK21
J95Great Shefford Obs. in England, 3 in MPECs 2017-E43, 2017-E46 & 2017-E47 -- 2017 EW, 2017 EV, 2017 ED
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-E45 -- 2017 EU
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-E45 -- 2017 EU
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2017-E44 & 2017-E45 -- 2017 EU, 2017 ET
900Moriyama Obs. in Japan, 1 in MPEC 2017-E46 -- 2017 EV
474Mt. John Obs. in New Zealand, 3 in MPECs 2017-E43 & 2017-E45 -- 2017 EU, 2017 DQ36, 2017 DC36
G96Mt. Lemmon Survey (MLS) in Arizona, 15 in MPECs 2017-E43, 2017-E44 & 2017-E46 -- 2017 EV, 2017 ET, 2017 ED, 2016 PR8, 2013 CL118, 2010 CM44, 2008 EE68, 2005 TF, 2005 ES70, 380981, 303933, 7335, 2329, 1916, 1862
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-E43 -- 2016 QC84
F51Pan-STARRS 1 (PS1) in Hawaii, 19 in MPECs 2017-E43 & 2017-E47 -- 2017 EW, 2017 BU31, 2017 BO31, 2016 WX9, 2016 QC84, 2010 HZ108, 2003 XV10, 480004, 471240, 408792, 386298, 38086, 367684, 31662, 162882, 154652, 144411, 5646, 4954
B49Paus Obs. in Spain, 1 in MPEC 2017-E43 -- 2017 DT15
W25RMS Obs., 4 in MPECs 2017-E43, 2017-E45, 2017-E46 & 2017-E47 -- 2017 EW, 2017 EV, 2017 EU, 2017 DC36
L04ROASTERR-1 in Romania, 2 in MPEC 2017-E43 -- 2008 ER7, 2006 EC1
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2017-E43 -- 2012 DR32
W881Tony Evans in Portugal via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-E45 -- 2017 EU
G45Space Surveillance Telescope Atom Site in New Mexico, 1 in MPEC 2017-E45 -- 2017 EU
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-E43 -- 34613
I52Steward Obs. Mt. Lemmon Station in Arizona, 5 in MPECs 2017-E43, 2017-E45 & 2017-E46 -- 2017 EV, 2017 EU, 2017 DZ108, 2017 DJ34, 2017 DB38
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-E43 -- 2017 DW108
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-E43 -- 2017 CN1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 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 DQ36NEODyS1930R E M O V E D-
JPL Sentry1614R E M O V E DJPL: Risk listing removed at 1609 UTC.
2016 WJ1NEODyS07112104-211564.65e-07-4.76-5.130NEODyS: "Based on 379 optical observations (of which 3 are rejected as outliers) from 2003-07-04.606 to 2016-12-15.993."

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 5 March '17

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

2323Grabbed MPEC 2017-E48 - 2015 LK21 - see above
Grabbed MPEC 2017-E49 - 2016 QM44 - see above
1944Updated Traffic Report
1930Noted that NEODyS has removed 2017 DQ36 as an impact risk - see above
1614Noted that JPL Sentry has removed 2017 DQ36 as an impact risk - see above
Grabbed MPEC 2017-E43 - Daily Orbit Update - see above
Grabbed MPEC 2017-E44 - 2017 ET - see above
Grabbed MPEC 2017-E45 - 2017 EU - see above
Grabbed MPEC 2017-E46 - 2017 EV - see above
Grabbed MPEC 2017-E47 - 2017 EW - see above
0711Noted that NEODyS has updated its 2016 WJ1 risk assessment - see above