Contents  on 3 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 3 March '17

Nine objects reported inside ten LD

There are nine asteroidal objects reported less than ten lunar distances (LD) from our home world today. Nearest are risk-listed intruder 2017 EA, which exits Earth's SOI as it moves away from 1.63 to 5.53 LD, and newly announced risk-listed 2017 DP109, which comes its closest to Earth on this passage, reaching 2.56 LD at 0739 UTC.

Earth passage I D ~Size Distance Today  Notes
0.05 LD yesterday2017 EA 3 m  1.63 to 5.53 LD exits Earth SOI, intruder, risk
1.02 LD Feb. 272017 DV36 9 m  9.38 to 11.78 LD exits ten LD
2.56 LD today2017 DP109 14 m  2.56 LD NEW, risk, Earth closest at 0739 UTC - MPEC
3.58 LD Feb. 242017 CP1 40 m  7.55 to 8.44 LD radar/NHATS target
4.07 LD Feb. 282017 DJ16 23 m  6.60 to 8.70 LD
4.68 LD yesterday2012 DR32 41 m  4.73 to 6.43 LD DOU
5.35 LD yesterday2017 ED 17 m  5.37 to 5.59 LD NEW - MPEC, DOU
7.29 LD Feb. 272017 DA38 35 m  9.71 to 10.90 LD exits ten LD - DOU
7.43 LD Feb. 282017 DS37 12 m  8.27 to 8.87 LD NHATS target

The traffic tables here were updated at 1920 UTC with data revised after today's DOU MPEC, which also carries follow-up for four departed objects: 2017 BN92, NHATS targets 2017 DC36 and 2017 DH16, and radar/NHATS target 2017 CF32. Your first neighborhood small objects traffic report was generated at 0621 UTC with new discoveries 2017 ED (MPEC) and 2017 DP109 (MPEC).

Approaching (sorted by 10-LD bubble entry date)
4.05 LD March 102017 DA36 32 m  < 10 LD March 5, NHATS target - DOU
9.64 LD March 82017 DV35 12 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
7.93 LD May 292017 CS 425 m  < 10 LD May 26, radar target - DOU



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 3 March '17

The MPC's NEO Confirmation Page has 60 listings

When last checked at 2323 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 60 objects listed. Of these, 35 were "one nighters." So far The Tracking News has counted a total of 84 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 3 March '17

Minor Planet Electronic Circulars

As of last check at 2323 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 3 Mar. '17 >>  MPEC 2017-E29 - "13:05 UT" - Daily Orbit Update


MPEC 2017-E28 - "03:08 UT" - 2017 DP109


MPEC 2017-E27 - "03:01 UT" - 2017 ED


MPEC 2017-E26 - "02:49 UT" - 2017 EC


MPEC 2017-E25 - "02:43 UT" - 2017 DO109


MPEC 2017-E24 - "02:36 UT" - 2017 DN109


MPEC 2017-E23 - "02:31 UT" - 2017 DM109


MPEC 2017-E22 - "02:24 UT" - 2017 DL109


MPEC 2017-E21 - "02:20 UT" - 2017 DK109

Observers  on 3 March '17

A total of 36 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2017-E29 -- 2017 DU37, 2017 DU36, 2017 DH16, 2017 BX5, 2017 BB94, 2017 AK21, 2016 YP4, 2015 DV215, 90075, 310842, 277810, 241662, 141018, 7888
C77Bernezzo Obs. in Italy, 2 in MPECs 2017-E26 & 2017-E27 -- 2017 ED, 2017 EC
V03Big Water Obs. in Utah, 1 in MPEC 2017-E29 -- 2012 DR32
160Castelmartini Obs. in Italy, 2 in MPEC 2017-E29 -- 12538, 5836
703Catalina Sky Survey (CSS) in Arizona, 37 in MPECs 2017-E27, 2017-E28 & 2017-E29 -- 2017 ED, 2017 DS36, 2017 DP109, 2017 DC36, 2017 DA38, 2017 CS, 2017 CO5, 2017 AC5, 2003 CR1, 2002 EM6, 2000 CE59, 90075, 53319, 482391, 480934, 475665, 443103, 386298, 370702, 310842, 274138, 252091, 248083, 203471, 190166, 175189, 144411, 143404, 141018, 136635, 10165, 5626, 4954, 4055, 3552, 2329, 1864
107Cavezzo Obs. in Italy, 2 in MPEC 2017-E29 -- 2017 DC36, 2013 YK148
K51Celado Obs. in Italy, 2 in MPECs 2017-E21 & 2017-E24 -- 2017 DN109, 2017 DK109
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2017-E25 & 2017-E29 -- 2017 DT37, 2017 DS35, 2017 DO109, 2017 CO5, 2017 BN92
K65Cesena Obs. in Italy, 1 in MPEC 2017-E26 -- 2017 EC
Z45Cosmos Obs., 1 in MPEC 2017-E29 -- 11398
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-E24 -- 2017 DN109
J95Great Shefford Obs. in England, 1 in MPEC 2017-E29 -- 2017 DW108
Q60ISON Siding Spring Obs. in New South Wales, 1 in MPEC 2017-E29 -- 193178
U699Steven M. Tilley in Louisiana via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-E29 -- 2017 BL30
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-E29 -- 2017 BL30
K38M57 Obs. in Italy, 1 in MPEC 2017-E26 -- 2017 EC
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2017-E22, 2017-E23, 2017-E24 & 2017-E28 -- 2017 DP109, 2017 DN109, 2017 DM109, 2017 DL109
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-E29 -- 90075
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-E21 -- 2017 DK109
474Mt. John Obs. in New Zealand, 5 in MPECs 2017-E21, 2017-E27 & 2017-E29 -- 2017 ED, 2017 DT35, 2017 DQ36, 2017 DK109, 2017 DC38
G96Mt. Lemmon Survey (MLS) in Arizona, 34 in MPECs 2017-E22, 2017-E24, 2017-E28 & 2017-E29 -- 2017 DX37, 2017 DV37, 2017 DP109, 2017 DO34, 2017 DN109, 2017 DL109, 2017 CO32, 2017 BU31, 2017 BE29, 2017 AP20, 2016 MK1, 2014 AD17, 2013 VC13, 2009 FR30, 2004 SW55, 2003 CR1, 2002 LS32, 85275, 54789, 465402, 452389, 425713, 347813, 343098, 310842, 220909, 162181, 152563, 143947, 136635, 7480, 7474, 7088, 3352
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-E29 -- 7474
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2017-E21, 2017-E22, 2017-E23, 2017-E25, 2017-E26 & 2017-E28 -- 2017 EC, 2017 DP109, 2017 DO109, 2017 DM109, 2017 DL109, 2017 DK109
B49Paus Obs. in Spain, 1 in MPEC 2017-E26 -- 2017 EC
H23Pear Tree Obs. in Florida, 1 in MPEC 2017-E29 -- 34613
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 26 in MPEC 2017-E29 -- 2017 DC36, 2017 DA38, 2017 DA36, 2017 CS, 2017 AP20, 2017 AC5, 2016 UU80, 2013 YK148, 2013 RM43, 2012 BB124, 2011 WO41, 2009 FR30, 2008 ER7, 2006 UM, 2006 EC1, 2002 LS32, 2002 EM6, 2000 CE59, 96590, 90075, 54789, 443103, 248083, 138155, 12538, 5131
D29Purple Mtn. Obs. Xuyi Station in China, 7 in MPEC 2017-E29 -- 2017 DC36, 2016 VV3, 418900, 351545, 198752, 152671, 144411
K61Rokycany Obs. in the Czech Republic, 2 in MPECs 2017-E26 & 2017-E27 -- 2017 ED, 2017 EC
H36Sandlot Obs. in Kansas, 2 in MPECs 2017-E26 & 2017-E29 -- 2017 EC, 2017 BL30
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-E29 -- 2017 DR15
G45Space Surveillance Telescope Atom Site (SST Atom Site) in New Mexico, 78 in MPECs 2017-E26 & 2017-E29 -- 2017 EC, 2017 DW35, 2017 DV35, 2017 DT37, 2017 DS36, 2017 DR15, 2017 DL34, 2017 DE38, 2017 DC36, 2017 CO5, 2017 CN32, 2017 CF32, 2017 BN3, 2017 AP20, 2017 AC5, 2016 YM1, 2016 UU80, 2016 SD, 2016 QC84, 2014 EW24, 2013 KY1, 2013 GL8, 2011 WO41, 2009 FR30, 2009 EM1, 2008 ER7, 2003 EZ16, 2002 EM6, 2000 CE59, 1996 FS1, 99935, 90075, 482391, 481904, 480934, 479325, 475665, 420286, 413002, 405427, 40267, 381906, 374038, 370702, 370307, 36017, 274138, 265482, 25916, 252091, 249595, 22771, 226198, 217807, 198752, 190166, 175189, 162882, 162063, 154652, 152671, 144411, 143404, 141447, 137170, 11398, 7888, 7480, 7335, 5646, 5626, 5189, 4954, 4055, 3552, 3199, 2329, 1916
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2017-E21 & 2017-E29 -- 2017 DS35, 2017 DR36, 2017 DK109, 2017 CF32, 2016 VV3
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-E28 -- 2017 DP109
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2017-E24 -- 2017 DN109
I52Steward Obs. Mt. Lemmon Station in Arizona, 5 in MPECs 2017-E21, 2017-E23, 2017-E24, 2017-E26 & 2017-E29 -- 2017 ED, 2017 EC, 2017 DN109, 2017 DM109, 2017 DK109
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-E29 -- 2016 WO1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 March '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2323 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 EANEODyS15092046-206642.36e-06-7.97-8.030NEODyS: "Based on 65 optical observations (of which 6 are rejected as outliers) from 2017-03-02.315 to 2017-03-02.495."
2017 DP109NEODyS18372057-211659.84e-07-6.96-7.320NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2017-02-23.446 to 2017-03-02.514."
JPL Sentry05072057-208638.0e-07-7.05-7.440JPL: "Analysis based on 28 observations spanning 7.0684 days (2017-Feb-23.44507 to 2017-Mar-02.513476)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
2017 DD38NEODyS1509R E M O V E D-
2017 DQ36JPL Sentry18442021-209781.9e-07-3.22-3.430JPL: "Analysis based on 37 observations spanning 8.1272 days (2017-Feb-22.23938 to 2017-Mar-02.36655)." Diameter approximately 0.482 km. from mean, weighted H=19.2.
NEODyS15092021-209783.99e-08-3.99-4.30NEODyS: "Based on 34 optical observations (of which 2 are rejected as outliers) from 2017-02-22.240 to 2017-03-02.120."

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 3 March '17

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

1920Updated Traffic Report
1844Noted that JPL Sentry has updated its 2017 DQ36 risk assessment - see above
1837Noted that NEODyS has posted 2017 DP109 as an impact risk - see above
1509Noted that NEODyS has removed 2017 DD38 as an impact risk - see above
Noted that NEODyS has updated its 2017 DQ36 risk assessment - see above
Noted that NEODyS has posted 2017 EA as an impact risk - see above
Grabbed MPEC 2017-E29 - Daily Orbit Update - see above
0507Noted that JPL Sentry has posted 2017 DP109 as an impact risk - see above
Grabbed MPEC 2017-E21 - 2017 DK109 - see above
Grabbed MPEC 2017-E22 - 2017 DL109 - see above
Grabbed MPEC 2017-E23 - 2017 DM109 - see above
Grabbed MPEC 2017-E24 - 2017 DN109 - see above
Grabbed MPEC 2017-E25 - 2017 DO109 - see above
Grabbed MPEC 2017-E26 - 2017 EC - see above
Grabbed MPEC 2017-E27 - 2017 ED - see above
Grabbed MPEC 2017-E28 - 2017 DP109 - see above