Contents  on 4 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 4 March '17

Ten objects reported inside ten LD

Today there are ten transient natural objects reported moving within ten lunar distances (LD) of Earth. Nearest are two newly announced objects. Intruder 2017 DS109 enters Earth's SOI, flying in from 4.18 to 1.79 LD, on its way to passing our planet tomorrow at 0.92 LD at 1428 UTC. And risk-listed 2017 DP109 is today outbound from 3.14 to 5.17 LD.

Earth passage I D ~Size Distance Today  Notes
0.05 LD March 22017 EA 3 m  5.53 to 9.44 LD intruder, risk
0.92 LD tomorrow2017 DS109 22 m  1.79 from 4.18 LD NEW, intruder, enters Earth SOI - MPEC
2.56 LD yesterday2017 DP109 14 m  3.14 to 5.17 LD risk
3.58 LD Feb. 242017 CP1 40 m  8.44 to 9.36 LD radar/NHATS target
4.07 LD Feb. 282017 DJ16 23 m  8.70 to 10.97 LD exits ten LD
4.68 LD March 22012 DR32 41 m  6.43 to 9.38 LD
4.87 LD tomorrow2017 EJ 28 m  5.75 from 10.55 LD NEW, enters ten LD - MPEC
5.35 LD March 22017 ED 17 m  5.59 to 6.02 LD NHATS target - DOU
7.43 LD March 72017 EF 13 m  8.91 from 10.26 LD NEW, enters ten LD - MPEC
7.43 LD Feb. 282017 DS37 12 m  8.87 to 9.59 LD NHATS target

This report was updated at 2142 UTC with five new discoveries. Four are currently inside or approaching our ten-LD traffic reporting "bubble" (see tables), and one has already left. 2017 DR109 (MPEC) slipped past us at 2.32 LD on February 23rd. Today's DOU MPEC carries the recovery of distant 2009 FE in addition to follow-up for three objects active in the traffic tables and for departed NHATS targets 2017 DC36 and 2017 DH16. Your first local asteroid traffic report was generated at 0521 UTC.

Approaching (sorted by 10-LD bubble entry date)
4.05 LD March 102017 DA36 32 m  < 10 LD tomorrow, NHATS target - DOU
9.65 LD March 82017 DV35 12 m  < 10 LD tomorrow, NHATS target - DOU
4.95 LD March 132017 EK 55 m  < 10 LD March 10, NEW - MPEC
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 presently 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.

NEOCP Activity  on 4 March '17

The MPC's NEO Confirmation Page has 69 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 69 objects listed. Of these, 55 were "one nighters." So far The Tracking News has counted a total of 92 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 4 March '17

Minor Planet Electronic Circulars

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


MPEC 2017-E42 - "19:50 UT" - Comet C/2017 E1 (Borisov)


MPEC 2017-E41 - "18:18 UT" - 2017 EL


MPEC 2017-E40 - "18:13 UT" - 2017 EO


MPEC 2017-E39 - "18:08 UT" - 2017 EN


MPEC 2017-E38 - "18:04 UT" - 2017 EM


MPEC 2017-E37 - "17:52 UT" - 2017 EK


MPEC 2017-E36 - "17:48 UT" - 2017 EJ


MPEC 2017-E35 - "17:43 UT" - 2017 EH


MPEC 2017-E34 - "17:35 UT" - 2017 EG


MPEC 2017-E33 - "17:29 UT" - 2017 EF


MPEC 2017-E32 - "17:22 UT" - 2017 DS109


MPEC 2017-E31 - "17:14 UT" - 2017 DR109


<< DOU on 4 Mar. '17 >>  MPEC 2017-E30 - "13:07 UT" - Daily Orbit Update

Observers  on 4 March '17

A total of 49 observers appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2017-E42 -- C/2017 E1
705"Kristie Nault via Apache Point Obs. in New Mexico, 3 in MPECs 2017-E34, 2017-E36 & 2017-E37 -- 2017 EK, 2017 EJ, 2017 EG
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2017-E30 -- 2017 DU36, 2017 DR15, 2017 DO109, 2017 DL34, 2017 DH16, 2017 DC36, 2017 DA36, 2017 BX5, 2017 BB94, 2013 CT36, 2009 FE, 277810, 241662, 155334, 2061
I47Auger Obs. in Argentina, 1 in MPEC 2017-E42 -- C/2017 E1
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-E32 -- 2017 DS109
R58Beverly-Begg Obs., 1 in MPEC 2017-E30 -- 153951
300Bisei Spaceguard Center in Japan, 3 in MPECs 2017-E32, 2017-E36 & 2017-E37 -- 2017 EK, 2017 EJ, 2017 DS109
215Buchloe Obs. in Germany, 1 in MPEC 2017-E30 -- 2017 DC36
160Castelmartini Obs. in Italy, 4 in MPEC 2017-E30 -- 2016 WJ1, 96590, 363831, 36236
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2017-E31, 2017-E32 & 2017-E39 -- 2017 EN, 2017 DS109, 2017 DR109
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 17 in MPECs 2017-E30, 2017-E37 & 2017-E40 -- 2017 EO, 2017 EK, 2017 DY108, 2017 DW35, 2017 DU15, 2017 DR15, 2017 DE38, 2017 CQ1, 2017 CO5, 2017 CG1, 2017 BU31, 2017 BL32, 2017 BJ92, 2017 BF29, 2017 BA30, 2016 YQ8, 2016 WU3
K65Cesena Obs. in Italy, 3 in MPECs 2017-E30 & 2017-E32 -- 2017 DS109, 2017 AC5, 2016 UU80
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2017-E32 & 2017-E42 -- C/2017 E1, 2017 DS109
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-E32 -- 2017 DS109
J95Great Shefford Obs. in England, 1 in MPEC 2017-E32 -- 2017 DS109
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-E42 -- C/2017 E1
H06%Ernesto Guido in Italy via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-E42 -- C/2017 E1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-E42 -- C/2017 E1
585Kiev Comet Station in the Ukraine, 3 in MPECs 2017-E32, 2017-E36 & 2017-E42 -- 2017 EJ, C/2017 E1, 2017 DS109
Q63LCOGT Siding Spring A in New South Wales, 1 in MPEC 2017-E39 -- 2017 EN
K91LCOGT Sutherland A in South Africa, 4 in MPECs 2017-E33, 2017-E34, 2017-E35 & 2017-E36 -- 2017 EJ, 2017 EH, 2017 EG, 2017 EF
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-E40 -- 2017 EO
K30Luscherz Obs. in Switzerland, 1 in MPEC 2017-E32 -- 2017 DS109
K38M57 Obs. in Italy, 1 in MPEC 2017-E32 -- 2017 DS109
H01Magdalena Ridge Obs. (MRO) in New Mexico, 10 in MPECs 2017-E31, 2017-E32, 2017-E33, 2017-E34, 2017-E35, 2017-E36, 2017-E37, 2017-E38, 2017-E40 & 2017-E41 -- 2017 EO, 2017 EM, 2017 EL, 2017 EK, 2017 EJ, 2017 EH, 2017 EG, 2017 EF, 2017 DS109, 2017 DR109
L51MARGO in the Ukraine, 1 in MPEC 2017-E42 -- C/2017 E1
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-E30 -- 7341
900Moriyama Obs. in Japan, 2 in MPECs 2017-E32 & 2017-E36 -- 2017 EJ, 2017 DS109
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-E37 -- 2017 EK
G96Mt. Lemmon Survey (MLS) in Arizona, 14 in MPECs 2017-E30, 2017-E31, 2017-E37, 2017-E38, 2017-E39 & 2017-E41 -- 2017 EN, 2017 EM, 2017 EL, 2017 EK, 2017 DR109, 2008 XP2, 2002 WY12, 1999 TZ4, 85275, 391275, 277279, 173561, 161995, 4503
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-E30 -- 2016 QC84
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2017-E32, 2017-E33, 2017-E34, 2017-E35 & 2017-E36 -- 2017 EJ, 2017 EH, 2017 EG, 2017 EF, 2017 DS109
B49Paus Obs. in Spain, 1 in MPEC 2017-E32 -- 2017 DS109
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 18 in MPEC 2017-E30 -- 2017 ED, 2017 DC36, 2017 DA36, 2017 CR32, 2017 AP20, 2017 AC5, 2016 UU80, 2013 YK148, 2011 WO41, 2008 ER7, 2006 UM, 2006 EC1, 2002 EM6, 2000 CE59, 90075, 89830, 40267, 11398
D29Purple Mtn. Obs. Xuyi Station in China, 14 in MPECs 2017-E30 & 2017-E32 -- 2017 DS109, 2017 BG85, 2016 YM1, 2013 VC13, 2011 QP96, 2009 FR30, 2008 ER7, 85275, 388838, 374038, 162063, 10165, 4055, 3552
W25RMS Obs., 1 in MPEC 2017-E32 -- 2017 DS109
L04ROASTERR-1 in Romania, 2 in MPECs 2017-E32 & 2017-E36 -- 2017 EJ, 2017 DS109
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2017-E32 -- 2017 DS109
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2017-E32, 2017-E33 & 2017-E36 -- 2017 EJ, 2017 EF, 2017 DS109
H36Sandlot Obs. in Kansas, 2 in MPECs 2017-E32 & 2017-E42 -- C/2017 E1, 2017 DS109
Q11Shinshiro Obs., 1 in MPEC 2017-E42 -- C/2017 E1
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-E30 -- 2017 DR15
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-E42 -- C/2017 E1
Y00SONEAR in Brazil, 2 in MPECs 2017-E32 & 2017-E42 -- C/2017 E1, 2017 DS109
G45Space Surveillance Telescope Atom Site (SST Atom Site) in New Mexico, 6 in MPECs 2017-E33, 2017-E34, 2017-E35, 2017-E36, 2017-E39 & 2017-E40 -- 2017 EO, 2017 EN, 2017 EJ, 2017 EH, 2017 EG, 2017 EF
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-E35 -- 2017 EH
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2017-E30, 2017-E33, 2017-E38, 2017-E40 & 2017-E42 -- 2017 EO, 2017 EM, 2017 EF, C/2017 E1, 2017 BT, 2017 AQ20, 2017 AM4
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-E30 -- 2013 GL8
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2017-E30 -- 159923
I52Steward Obs. Mt. Lemmon Station in Arizona, 15 in MPECs 2017-E30, 2017-E31, 2017-E32, 2017-E34, 2017-E35, 2017-E37, 2017-E38, 2017-E39 & 2017-E41 -- 2017 EN, 2017 EM, 2017 EL, 2017 EK, 2017 EH, 2017 EG, 2017 DW37, 2017 DV35, 2017 DU15, 2017 DS109, 2017 DR37, 2017 DR109, 2017 DQ37, 2017 DC109, 2017 CO1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-E30 -- 2017 AR4, 2016 XQ23, 2016 UT80
C42Xingming Obs. in China, 1 in MPEC 2017-E32 -- 2017 DS109
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 DQ36NEODyS16182021-209762.17e-08-4.52-4.790NEODyS: "Based on 37 optical observations (of which 2 are rejected as outliers) from 2017-02-22.240 to 2017-03-02.367."
2017 BL30NEODyS16182052-210947.0e-08-6.68-6.890NEODyS: "Based on 300 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-03-03.172."
2008 EK68JPL Sentry05122019-21153125.0e-06-7.65-9.100JPL: "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=29.9.

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 4 March '17

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

2142Updated Traffic Report
2034Grabbed MPEC 2017-E42 - Comet C/2017 E1 (Borisov) - see above
1951Grabbed MPEC 2017-E38 - 2017 EM - see above
Grabbed MPEC 2017-E39 - 2017 EN - see above
Grabbed MPEC 2017-E40 - 2017 EO - see above
Grabbed MPEC 2017-E41 - 2017 EL - see above
1802Grabbed MPEC 2017-E34 - 2017 EG - see above
Grabbed MPEC 2017-E35 - 2017 EH - see above
Grabbed MPEC 2017-E36 - 2017 EJ - see above
Grabbed MPEC 2017-E37 - 2017 EK - see above
1733Grabbed MPEC 2017-E31 - 2017 DR109 - see above
Grabbed MPEC 2017-E32 - 2017 DS109 - see above
Grabbed MPEC 2017-E33 - 2017 EF - see above
1618Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 DQ36 risk assessment - see above
Grabbed MPEC 2017-E30 - Daily Orbit Update - see above
0512Noted that JPL Sentry has updated its 2008 EK68 risk assessment - see above