Contents  on 28 February '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 28 February '17

Eleven objects reported inside ten LD

Today we have eleven transient natural objects inside ten lunar distances (LD) of our planet. Nearest is 2017 DV36, which exits Earth's SOI as it moves outward from 2.35 to 4.63 LD. Further out, returning 2012 DR32 enters our ten-LD traffic reporting zone, coming in from 11.46 to 8.20 LD, and 2017 DT34 exits from 9.46 to 11.78 LD, as does newly announced 2017 DF38, which slips off from 9.58 to 10.47 LD. And there are two other new discoveries that won't be coming closer than seven LD this time around, including 2017 DS37, which got its closest early today -- 7.43 LD at 0119 UTC, and 2017 DA38, outbound from 7.41 to 7.89 LD.

Earth passage I D ~Size Distance Today  Notes
0.36 LD Feb. 232017 DG16 4 m  6.07 to 7.53 LD intruder, NHATS target, risk
0.58 LD Feb. 252017 DR34 5 m  7.12 to 9.65 LD intruder
1.02 LD yesterday2017 DV36 9 m  2.35 to 4.63 LD exits Earth SOI
2.44 LD Feb. 242017 DT34 10 m  9.46 to 11.78 LD exits ten LD
3.58 LD Feb. 242017 CP1 40 m  5.09 to 5.85 LD radar/NHATS target - DOU
4.07 LD today2017 DJ16 23 m  4.07 LD NHATS target, Earth closest at 2149 UTC
4.68 LD March 22012 DR32 41 m  8.20 from 11.46 LD enters ten LD - DOU
7.12 LD yesterday2017 DS34 24 m  7.17 to 9.18 LD DOU
7.29 LD yesterday2017 DA38 35 m  7.41 to 7.89 LD NEW - MPEC
7.43 LD today2017 DS37 12 m  7.43 LD NEW - Earth closest at 0119 UTC - MPEC
8.88 LD Feb. 262017 DF38 20 m  9.58 to 10.47 LD NEW, exits ten LD - MPEC

This report was updated at 2117 UTC with four discoveries 2017 DF38 (MPEC), 2017 DA38 (MPEC), 2017 DS37 (MPEC), and already departed 2017 DZ37 (MPEC), which skimmed past the Earth-Moon system on February 23rd at 1.01 LD from Earth and 1.42 LD from the Moon. Today's DOU MPEC has first follow-up for departed 2017 DZ35 and recently recovered inbound 2012 DR32, along with continuing follow-up for outbound 2017 DS34 and radar/NHATS target 2017 CP1; approaching NHATS target 2017 DA36 and radar target 2017 CS; and four departed objects: 2017 DU34 and NHATS targets 2017 DC36, 2017 DX34, and 2016 TB57, which was also a radar target.
        Our first preliminary neighborhood traffic report was generated at 0543 UTC and noted radar observation of departed 2017 BY93 posted late yesterday.

Approaching (sorted by 10-LD bubble entry date)
4.05 LD March 102017 DA36 34 m  < 10 LD March 5, NHATS target - DOU
9.65 LD March 82017 DV35 12 m  < 10 LD March 5, NHATS target
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 - 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.

Radar Astrometry  on 28 February '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 0115 UTC when the database was dated 27 Feb.

NEOCP Activity  on 28 February '17

The MPC's NEO Confirmation Page has 57 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 57 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 97 listings on the NEOCP today.

New MPECs  on 28 February '17

Minor Planet Electronic Circulars

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


MPEC 2017-D110 - "18:29 UT" - 2017 DZ37


MPEC 2017-D109 - "18:25 UT" - 2017 DF38


MPEC 2017-D108 - "18:20 UT" - 2017 DE38


MPEC 2017-D107 - "18:15 UT" - 2017 DD38


MPEC 2017-D106 - "18:10 UT" - 2017 DC38


MPEC 2017-D105 - "17:58 UT" - 2017 DB38


MPEC 2017-D104 - "17:52 UT" - 2017 DA38


MPEC 2017-D103 - "17:47 UT" - 2017 DY37


MPEC 2017-D102 - "17:42 UT" - 2017 DX37


MPEC 2017-D101 - "17:37 UT" - 2017 DW37


MPEC 2017-D100 - "17:33 UT" - 2017 DV37


MPEC 2017-D99 - "17:28 UT" - 2017 DU37


MPEC 2017-D98 - "17:24 UT" - 2017 DT37


MPEC 2017-D97 - "17:19 UT" - 2017 DS37


MPEC 2017-D96 - "17:14 UT" - 2017 DR37


MPEC 2017-D95 - "17:08 UT" - 2017 DQ37


<< DOU on 28 Feb. '17 >>  MPEC 2017-D94 - "13:07 UT" - Daily Orbit Update

Observers  on 28 February '17

A total of 50 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2015 BN509
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2017-D94 -- 2017 DC, 2017 CQ, 2017 BN32, 2013 CJ89, 2012 FK35, 2003 WW87, 161995
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-D94 -- 138846, 10636, 1036
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-D94 -- 2006 EC1
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-D104 -- 2017 DA38
300Bisei Spaceguard Center in Japan, 4 in MPECs 2017-D98, 2017-D104, 2017-D108 & 2017-D109 -- 2017 DT37, 2017 DF38, 2017 DE38, 2017 DA38
Z84Calar Alto Schmidt in Spain, 3 in MPECs 2017-D102, 2017-D103 & 2017-D104 -- 2017 DY37, 2017 DX37, 2017 DA38
160Castelmartini Obs. in Italy, 1 in MPEC 2017-D104 -- 2017 DA38
703Catalina Sky Survey (CSS) in Arizona, 17 in MPECs 2017-D94, 2017-D104 & 2017-D109 -- 2017 DR15, 2017 DM34, 2017 DF38, 2017 DA38, 2017 AP20, 2016 UU80, 2016 QC84, 2012 DR32, 2009 FR30, 99935, 96590, 40267, 34613, 11398, 5693, 3103, 1862
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPECs 2017-D94, 2017-D100, 2017-D102, 2017-D105, 2017-D106, 2017-D107 & 2017-D108 -- 2017 DX37, 2017 DV37, 2017 DU15, 2017 DT15, 2017 DE38, 2017 DD38, 2017 DC38, 2017 DB38, 2017 CN32, 2017 CJ1, 2017 BM92, 2016 QF45
958Dax Obs. in France, 1 in MPEC 2017-D104 -- 2017 DA38
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPECs 2017-D97, 2017-D101, 2017-D107, 2017-D108 & 2017-D110 -- 2017 DZ37, 2017 DW37, 2017 DS37, 2017 DE38, 2017 DD38
006Fabra Obs. in Spain, 5 in MPEC 2017-D94 -- 54789, 40267, 11398, 10636, 3352
E10*program code "*" (19) via Faulkes Telescope South in New South Wales, 1 in MPEC 2017-D94 -- 2017 CP1
K83Forti Obs., 4 in MPEC 2017-D94 -- 2017 DC36, 90075, 40267, 11398
K88GINOP-KHK in Hungary, 1 in MPEC 2017-D94 -- 10165
J95Great Shefford Obs. in England, 1 in MPEC 2017-D94 -- 2017 DW34
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 3 in MPECs 2017-D98, 2017-D104 & 2017-D109 -- 2017 DT37, 2017 DF38, 2017 DA38
585Kiev Comet Station in the Ukraine, 1 in MPEC 2017-D104 -- 2017 DA38
K92LCOGT Sutherland B in South Africa, 2 in MPECs 2017-D106 & 2017-D107 -- 2017 DD38, 2017 DC38
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2017-D105 -- 2017 DB38
D35Lulin Minor Bodies Tracking (LIMIT) in Taiwan, 3 in MPECs 2017-D100, 2017-D104 & 2017-D109 -- 2017 DV37, 2017 DF38, 2017 DA38
130Lumezzane Obs. in Italy, 6 in MPEC 2017-D94 -- 2014 DH23, 2013 GL8, 479325, 386298, 370702, 351545
H01Magdalena Ridge Obs. (MRO) in New Mexico, 11 in MPECs 2017-D94, 2017-D95, 2017-D96, 2017-D97, 2017-D99, 2017-D100, 2017-D101, 2017-D103, 2017-D104, 2017-D109 & 2017-D110 -- 2017 DZ37, 2017 DY37, 2017 DW37, 2017 DV37, 2017 DU37, 2017 DS37, 2017 DR37, 2017 DQ37, 2017 DF38, 2017 DC36, 2017 DA38
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-D99 -- 2017 DU37
900Moriyama Obs. in Japan, 2 in MPECs 2017-D104 & 2017-D109 -- 2017 DF38, 2017 DA38
474Mt. John Obs. in New Zealand, 15 in MPECs 2017-D94, 2017-D97, 2017-D98, 2017-D100, 2017-D102, 2017-D105, 2017-D106, 2017-D107, 2017-D108 & 2017-D110 -- 2017 DZ37, 2017 DZ35, 2017 DX37, 2017 DV37, 2017 DT37, 2017 DT35, 2017 DS37, 2017 DS34, 2017 DQ36, 2017 DE38, 2017 DD38, 2017 DC38, 2017 DB38, 2017 BP31, 2017 BP3
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2017-D95, 2017-D96, 2017-D97, 2017-D101, 2017-D102, 2017-D103, 2017-D105 & 2017-D110 -- 2017 DZ37, 2017 DY37, 2017 DX37, 2017 DW37, 2017 DS37, 2017 DR37, 2017 DQ37, 2017 DB38
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-D104 -- 2017 DA38
J43Oukaimeden Obs. in Morocco, 2 in MPEC 2017-D94 -- 2003 EZ16, 388838
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2017-D94, 2017-D97, 2017-D99, 2017-D100, 2017-D105, 2017-D106, 2017-D107, 2017-D108 & 2017-D109 -- 2017 DV37, 2017 DU37, 2017 DS37, 2017 DF38, 2017 DE38, 2017 DD38, 2017 DC38, 2017 DB38, 2016 PR8, 2014 DJ112, 438955, 386298, 38086, 144411
K63Pascoli Obs. in Italy, 1 in MPEC 2017-D104 -- 2017 DA38
B49Paus Obs. in Spain, 1 in MPEC 2017-D104 -- 2017 DA38
W25RMS Obs., 2 in MPECs 2017-D98 & 2017-D104 -- 2017 DT37, 2017 DA38
L04ROASTERR-1 in Romania, 3 in MPECs 2017-D94, 2017-D104 & 2017-D109 -- 2017 DF38, 2017 DA38, 2017 BU6
K33San Defendente Obs. in Italy, 1 in MPEC 2017-D104 -- 2017 DA38
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-D101 & 2017-D104 -- 2017 DW37, 2017 DA38
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-D100 -- 2017 DV37
A29Santa Maria a Monte Obs. in Italy, 1 in MPEC 2017-D104 -- 2017 DA38
204Schiaparelli Obs. in Italy, 2 in MPECs 2017-D98 & 2017-D104 -- 2017 DT37, 2017 DA38
W77Skyledge Obs., 1 in MPEC 2017-D94 -- 370702
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-D94 -- 2017 DC36
G45Space Surveillance Telescope Atom Site (SST Atom Site) in New Mexico, 76 in MPECs 2017-D94 & 2017-D98 -- 2017 DT37, 2017 DT15, 2017 DR15, 2017 DP35, 2017 DM34, 2017 DC36, 2017 DA36, 2017 CS, 2017 CN1, 2017 BU31, 2017 BP31, 2017 AP20, 2017 AC5, 2016 YM1, 2016 UU80, 2016 PR8, 2014 EW24, 2014 DH23, 2013 VC13, 2013 KY1, 2013 GL8, 2008 ER7, 2008 CA6, 2003 EZ16, 2003 CR1, 2002 LS32, 2002 EM6, 2000 CE59, 99935, 90075, 53319, 482391, 481904, 459872, 420286, 418900, 413002, 40267, 386298, 385343, 38086, 370702, 370307, 357618, 351545, 34613, 317255, 310842, 25916, 22771, 226198, 205378, 198752, 190166, 175189, 162882, 154652, 152671, 144411, 138359, 138155, 137158, 136635, 13651, 11398, 5693, 5646, 5626, 5189, 4954, 4055, 3552, 3103, 1917, 1916, 1864
691Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2017-D94, 2017-D105 & 2017-D106 -- 2017 DT35, 2017 DC38, 2017 DB38
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-D99 -- 2017 DU37
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2017-D101 & 2017-D104 -- 2017 DW37, 2017 DA38
I52Steward Obs. Mt. Lemmon Station in Arizona, 13 in MPECs 2017-D94, 2017-D95, 2017-D96, 2017-D98, 2017-D101, 2017-D102, 2017-D103 & 2017-D109 -- 2017 DY37, 2017 DX37, 2017 DX34, 2017 DW37, 2017 DV34, 2017 DU34, 2017 DT37, 2017 DR37, 2017 DQ37, 2017 DQ34, 2017 DP34, 2017 DL34, 2017 DF38
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-D94 -- 2017 BF30, 2016 TB57
718Wiggins Obs. in Utah, 1 in MPEC 2017-D104 -- 2017 DA38
C51WISE in Earth polar orbit, 8 in MPEC 2017-D94 -- 2017 BA30, 2009 DE47, 2006 CY10, 53319, 345646, 163191, 152931, 5653
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 February '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 DQ36JPL Sentry17362021-2110212.2e-07-2.87-3.040JPL: "Analysis based on 24 observations spanning 5.1431 days (2017-Feb-22.23938 to 2017-Feb-27.38245)." Diameter approximately 0.455 km. from mean, weighted H=19.4.
NEODyS17362021-2105253.73e-08-4.04-4.460NEODyS: "Based on 24 optical observations (of which 2 are rejected as outliers) from 2017-02-22.240 to 2017-02-27.383."

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 28 February '17

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

2117Updated Traffic Report
1831Grabbed MPEC 2017-D105 - 2017 DB38 - see above
Grabbed MPEC 2017-D106 - 2017 DC38 - see above
Grabbed MPEC 2017-D107 - 2017 DD38 - see above
Grabbed MPEC 2017-D108 - 2017 DE38 - see above
Grabbed MPEC 2017-D109 - 2017 DF38 - see above
Grabbed MPEC 2017-D110 - 2017 DZ37 - see above
1803Grabbed MPEC 2017-D101 - 2017 DW37 - see above
Grabbed MPEC 2017-D102 - 2017 DX37 - see above
Grabbed MPEC 2017-D103 - 2017 DY37 - see above
Grabbed MPEC 2017-D104 - 2017 DA38 - see above
1736Noted that JPL Sentry has updated its 2017 DQ36 risk assessment - see above
Noted that NEODyS has updated its 2017 DQ36 risk assessment - see above
Grabbed MPEC 2017-D95 - 2017 DQ37 - see above
Grabbed MPEC 2017-D96 - 2017 DR37 - see above
Grabbed MPEC 2017-D97 - 2017 DS37 - see above
Grabbed MPEC 2017-D98 - 2017 DT37 - see above
Grabbed MPEC 2017-D99 - 2017 DU37 - see above
Grabbed MPEC 2017-D100 - 2017 DV37 - see above
1616Grabbed MPEC 2017-D94 - Daily Orbit Update - see above
0115Noted Radar Astrometry database update - see above