Contents  on 25 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 25 February '17

Ten objects reported inside ten LD

There are ten Solar-System small bodies reported to be within ten lunar distances (LD) of Earth today. Nearest is intruder 2017 DR34, which moves in from 0.78 LD to pass us at 0.58 LD at 0451 UTC, then moves out to 2.11 LD, buzzing the Moon along the way at 0.70 LD at 1150 UTC.

Further away, newly announced 2017 DD36 is outbound from 5.15 to 6.88 LD, and two NHATS targets cross our ten-LD traffic reporting boundary: 2017 DJ16 enters from 10.55 to 8.30 LD and radar target 2017 BW leaves from 9.90 to 10.89 LD.

Earth passage I D ~Size Distance Today  Notes
0.36 LD Feb. 232017 DG16 4 m  1.70 to 3.15 LD intruder, NHATS target, exits Earth SOI, risk
0.58 LD today2017 DR34 5 m  0.58 LD intruder today, Earth closest at 0451 UTC, Moon closest 0.70 LD at 1402 UTC
1.82 LD Feb. 202017 DB 13 m  8.02 to 9.79 LD NHATS target
2.09 LD Feb. 192017 DF 16 m  7.00 to 8.13 LD NHATS target - DOU
2.37 LD Feb. 232017 BY93 79 m  5.25 to 9.32 LD radar target, risk - DOU
2.44 LD yesterday2017 DT34 10 m  3.17 to 5.03 LD
2.49 LD Feb. 222017 DD36 14 m  5.15 to 6.88 LD NEW - MPEC, DOU
3.58 LD yesterday2017 CP1 40 m  3.63 to 3.92 LD radar/NHATS target - DOU
4.07 LD Feb. 282017 DJ16 24 m  8.30 from 10.55 LD enters ten LD, NHATS target - DOU
4.63 LD Feb. 172017 BW 69 m  9.90 to 10.89 LD exits ten LD, radar/NHATS target - DOU

What's coming around next now also includes new discoveries 2017 DV35 and 2017 DA36, both arriving inside ten LD on or about March 5th.

Approaching (sorted by 10-LD bubble entry date)
7.12 LD Feb. 272017 DS34 24 m  < 10 LD tomorrow
4.68 LD March 22012 DR32 41 m  < 10 LD Feb. 28
9.63 LD March 82017 DV35 12 m  < 10 LD March 5, NEW - MPEC, DOU
4.0   LD March 102017 DA36 35 m  < 10 LD March 5, NEW, uncertainty +/- 30 mins. - MPEC, 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
7.9   LD May 292017 CS 438 m  < 10 LD May 26, uncertainty +/- 20 mins. - DOU

This report was generated at 1846 UTC with new discoveries 2017 DD36 (MPEC, DOU), 2017 DA36 (MPEC, DOU), 2017 DV35 (MPEC, DOU), and two already departed objects: 2017 DC36 (MPEC, DOU), which passed our planet at 4.23 LD on February 18th, and 2017 DZ35 (MPEC), which went by at 6.40 LD the next day. The DOU MPEC today has first follow-up for three departed objects: 2017 CX31 (12.05 days added to 3.05-day discovery arc), and NHATS targets 2017 DK34 and 2017 DH16, along with continuing follow-up for inbound NHATS target 2017 DJ16, four outbound objects: risk-listed radar target 2017 BY93, NHATS target 2017 DF, and radar/NHATS targets 2017 CP1 and 2017 BW, approaching 2017 CS, and departed radar/NHATS target 2017 CF32.



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 25 February '17

The MPC's NEO Confirmation Page has 100 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 100 objects listed. Of these, 43 were "one nighters." So far The Tracking News has counted a total of 136 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 25 February '17

Minor Planet Electronic Circulars

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


MPEC 2017-D78 - "22:42 UT" - 2000 EM26


<< DOU on 25 Feb. '17 >>  MPEC 2017-D77 - "13:07 UT" - Daily Orbit Update


MPEC 2017-D76 - "11:56 UT" - 2016 PT


MPEC 2017-D75 - "06:28 UT" - 2017 DC36


MPEC 2017-D74 - "06:21 UT" - 2017 DB36


MPEC 2017-D73 - "06:13 UT" - 2017 DA36


MPEC 2017-D72 - "06:06 UT" - 2017 DZ35


MPEC 2017-D71 - "05:59 UT" - 2017 DX35


MPEC 2017-D70 - "05:49 UT" - 2017 DW35


MPEC 2017-D69 - "05:41 UT" - 2017 DD36


MPEC 2017-D68 - "05:35 UT" - 2017 DV35


MPEC 2017-D67 - "05:28 UT" - 2017 DY35


MPEC 2017-D66 - "05:24 UT" - 2017 DU35


MPEC 2017-D65 - "05:18 UT" - 2017 DT35


MPEC 2017-D64 - "05:13 UT" - 2017 DS35


MPEC 2017-D63 - "05:07 UT" - 2017 DR35


MPEC 2017-D62 - "05:01 UT" - 2017 DQ35


MPEC 2017-D61 - "04:55 UT" - 2017 DP35


MPEC 2017-D60 - "04:47 UT" - 2017 DO35

Observers  on 25 February '17

A total of 47 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 10 in MPEC 2017-D77 -- 2017 DT15, 2017 DR15, 2017 DJ16, 2017 DH16, 2017 CF32, 2017 BM31, 2017 BM123, 2017 AK21, 2015 BQ510, 2009 EM1
H21Astronomical Research Obs. Westfield in Illinois, 26 in MPEC 2017-D77 -- 2017 DU15, 2017 DT15, 2017 CX31, 2017 CR32, 2017 CQ, 2017 CP1, 2017 CO5, 2017 BN3, 2017 BL32, 2017 BL30, 2017 BJ92, 2017 AF5, 2016 YR8, 2016 FA4, 2011 WO41, 2007 DW, 2003 UF22, 68346, 370702, 265482, 226198, 5693, 5653, 4055, 3103, 1627
T05ATLAS Haleakala in Hawaii, 6 in MPECs 2017-D75 & 2017-D77 -- 2017 DC36, 370702, 310842, 143404, 5626, 4055
T08ATLAS Mauna Loa in Hawaii, 2 in MPECs 2017-D75 & 2017-D77 -- 2017 DC36, 10636
300Bisei Spaceguard Center in Japan, 3 in MPECs 2017-D61, 2017-D69 & 2017-D75 -- 2017 DP35, 2017 DD36, 2017 DC36
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2017-D77 -- 7341
160Castelmartini Obs. in Italy, 14 in MPEC 2017-D77 -- 2017 CP1, 2016 UU80, 2001 QE34, 54789, 34613, 345705, 310842, 13651, 11398, 10165, 5693, 4179, 1943, 1627
703Catalina Sky Survey (CSS) in Arizona, 33 in MPECs 2017-D69, 2017-D75 & 2017-D77 -- 2017 DR15, 2017 DD36, 2017 DC36, 2017 BG85, 2017 AC5, 2016 YM1, 2014 DH23, 2009 DE47, 2008 ER7, 2006 EC1, 2003 CR1, 2000 CE59, 90075, 480934, 475665, 448003, 386298, 370702, 370307, 317255, 274138, 265482, 248083, 22771, 144411, 137158, 10165, 7088, 5626, 4055, 3552, 3103, 2329
958Dax Obs. in France, 3 in MPECs 2017-D61, 2017-D69 & 2017-D75 -- 2017 DP35, 2017 DD36, 2017 DC36
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPEC 2017-D77 -- 2016 FA4, 2016 CX247
E10*program code "*" (19) via Faulkes Telescope South in New South Wales, 1 in MPEC 2017-D77 -- 2017 CP1
K83Forti Obs., 1 in MPEC 2017-D77 -- 4179
K88GINOP-KHK in Hungary, 3 in MPEC 2017-D77 -- 2017 DT15, 2017 DR15, 2017 BW
J95Great Shefford Obs. in England, 5 in MPECs 2017-D61, 2017-D66, 2017-D71, 2017-D73 & 2017-D75 -- 2017 DX35, 2017 DU35, 2017 DP35, 2017 DC36, 2017 DA36
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2017-D75 -- 2017 DC36
O75ISON Hureltogoot Obs. in Mongolia, 3 in MPECs 2017-D61, 2017-D73 & 2017-D75 -- 2017 DP35, 2017 DC36, 2017 DA36
Q60ISON Siding Spring Obs. in New South Wales, 4 in MPEC 2017-D77 -- 2013 LB1, 480004, 21088, 7341
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-D75 -- 2017 DC36
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 3 in MPECs 2017-D69, 2017-D75 & 2017-D77 -- 2017 DD36, 2017 DC36, 20255
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-D72 -- 2017 DZ35
K92LCOGT Sutherland B in South Africa, 3 in MPECs 2017-D65, 2017-D75 & 2017-D77 -- 2017 DT35, 2017 DC36, 2017 BY93
K30Luscherz Obs. in Switzerland, 3 in MPECs 2017-D69, 2017-D75 & 2017-D77 -- 2017 DD36, 2017 DC36, 2017 BM123
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2017-D68, 2017-D73 & 2017-D77 -- 2017 DV35, 2017 DO34, 2017 DA36
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-D77 -- 2013 GL8
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-D77 -- 1036
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-D77 -- 226198
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2017-D64 & 2017-D72 -- 2017 DZ35, 2017 DS35
108Montelupo Obs. in Italy, 4 in MPEC 2017-D77 -- 2001 QE34, 11398, 3103, 1036
900Moriyama Obs. in Japan, 1 in MPEC 2017-D75 -- 2017 DC36
474Mt. John Obs. in New Zealand, 7 in MPECs 2017-D65, 2017-D66, 2017-D68, 2017-D73, 2017-D75 & 2017-D77 -- 2017 DV35, 2017 DU35, 2017 DT35, 2017 DC36, 2017 DA36, 2017 BU31, 2017 BL32
G96Mt. Lemmon Survey (MLS) in Arizona, 34 in MPECs 2017-D60, 2017-D61, 2017-D62, 2017-D63, 2017-D66, 2017-D67, 2017-D68, 2017-D70, 2017-D73, 2017-D75 & 2017-D77 -- 2017 DY35, 2017 DW35, 2017 DV35, 2017 DU35, 2017 DR35, 2017 DR15, 2017 DQ35, 2017 DQ34, 2017 DP35, 2017 DO35, 2017 DF, 2017 DE, 2017 DC36, 2017 DA36, 2017 CS, 2017 BN32, 2017 AF5, 2017 AC5, 2016 YN4, 99935, 90075, 480934, 477490, 475665, 465402, 437846, 232382, 102873, 7480, 5693, 3103, 2329, 1864, 1862
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-D77 -- 2017 DP34
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-D75 -- 2017 DC36
C23Olmen Obs. in Belgium, 1 in MPEC 2017-D75 -- 2017 DC36
C27Pallerols Obs. in Spain, 1 in MPEC 2017-D77 -- 2017 DC36
F51Pan-STARRS 1 (PS1) in Hawaii, 25 in MPECs 2017-D61, 2017-D62, 2017-D63, 2017-D64, 2017-D65, 2017-D66, 2017-D71, 2017-D72, 2017-D74, 2017-D77 & 2017-D78 -- 2017 DZ35, 2017 DX35, 2017 DW34, 2017 DU35, 2017 DT35, 2017 DS35, 2017 DR35, 2017 DR15, 2017 DQ35, 2017 DP35, 2017 DB36, 2017 BO31, 2016 QC84, 2016 NV, 2005 YV55, 2005 EY169, 2004 BD68, 2000 EM26, 480934, 442523, 40263, 325769, 249595, 159504, 102873
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 37 in MPEC 2017-D77 -- 2017 DR15, 2017 CP1, 2017 CF32, 2017 BU31, 2017 BM123, 2017 BL30, 2017 BK92, 2017 AP20, 2016 UU80, 2015 BY310, 2013 YK148, 2013 GL8, 2012 BB124, 2011 WO41, 2008 ER7, 2005 EY223, 2003 CR1, 2002 LS32, 2001 QE34, 2000 CE59, 90075, 89830, 54789, 479325, 443103, 40267, 349507, 347813, 310842, 252558, 226198, 152931, 13651, 12538, 11398, 5693, 3352
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPEC 2017-D77 -- 2000 CE59, 90075, 351545, 154652, 10165, 4055
L04ROASTERR-1 in Romania, 1 in MPEC 2017-D75 -- 2017 DC36
K61Rokycany Obs. in the Czech Republic, 5 in MPECs 2017-D61, 2017-D66, 2017-D70, 2017-D73 & 2017-D75 -- 2017 DW35, 2017 DU35, 2017 DP35, 2017 DC36, 2017 DA36
A29Santa Maria a Monte Obs. in Italy, 1 in MPEC 2017-D77 -- 2017 CP1
Y00SONEAR in Brazil, 3 in MPECs 2017-D75 & 2017-D77 -- 2017 DC36, 40267, 11066
G45Space Surveillance Telescope Atom Site (SST Atom Site) in New Mexico, 3 in MPECs 2017-D61, 2017-D70 & 2017-D71 -- 2017 DX35, 2017 DW35, 2017 DP35
691Spacewatch 0.9m telescope in Arizona, 27 in MPECs 2017-D62, 2017-D64, 2017-D66, 2017-D67, 2017-D70, 2017-D77 & 2017-D78 -- 2017 DY35, 2017 DW35, 2017 DU35, 2017 DT35, 2017 DS35, 2017 DQ35, 2017 CO1, 2017 BX32, 2017 BM31, 2017 BL6, 2017 BL32, 2017 BL31, 2017 BL30, 2017 BG32, 2016 XD1, 2016 WF9, 2016 AU8, 2015 FJ36, 2014 DP7, 2010 HZ108, 2010 DP, 2009 UN3, 2009 EM1, 2004 BV1, 2004 AY1, 2000 EM26, 1999 LW1
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2017-D64, 2017-D66 & 2017-D77 -- 2017 DU35, 2017 DS35, 2017 BX5, 2017 BP91, 2017 BO31, 2017 BH3, 2017 BE3, 2017 BA30, 2016 QH44, 2016 PZ66, 2016 MH1, 2013 CK89, 2012 EY11
I52Steward Obs. Mt. Lemmon Station in Arizona, 32 in MPECs 2017-D60, 2017-D61, 2017-D62, 2017-D63, 2017-D64, 2017-D66, 2017-D67, 2017-D68, 2017-D70, 2017-D71, 2017-D72, 2017-D73, 2017-D74 & 2017-D77 -- 2017 DZ35, 2017 DY35, 2017 DX35, 2017 DW35, 2017 DW34, 2017 DV35, 2017 DU35, 2017 DT15, 2017 DS35, 2017 DR35, 2017 DQ35, 2017 DQ34, 2017 DP35, 2017 DP34, 2017 DO35, 2017 DO34, 2017 DL34, 2017 DK34, 2017 DJ34, 2017 DJ16, 2017 DH16, 2017 DF, 2017 DD36, 2017 DD, 2017 DC36, 2017 DB36, 2017 DA36, 2017 CO32, 2017 CA33, 2017 BO31, 2015 CU, 2011 ED78
J22Tacande Obs. in the Canary Islands, 2 in MPECs 2017-D75 & 2017-D77 -- 2017 DC36, 2013 YK148
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 6 in MPECs 2017-D76 & 2017-D77 -- 2017 BY93, 2017 BO32, 2017 BL30, 2016 QH44, 2016 PT, 2011 YW10
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 DG16NEODyS15462079-210581.04e-05-7.41-7.440NEODyS: "Based on 37 optical observations (of which 3 are rejected as outliers) from 2017-02-21.237 to 2017-02-23.805."
2017 CA33JPL Sentry1706R E M O V E DJPL: Risk listing removed at 1702 UTC.
2017 BY93NEODyS15462068-207028.03e-08-6.02-6.240NEODyS: "Based on 152 optical observations (of which 3 are rejected as outliers) from 2017-01-26.500 to 2017-02-23.616."
2017 BO32JPL Sentry1624R E M O V E DJPL: Risk listing removed at 1609 UTC.
2017 BW30NEODyS15462074-2117123.45e-08-7.14-7.620NEODyS: "Based on 53 optical observations (of which 1 are rejected as outliers) from 2017-01-28.542 to 2017-02-06.173."
2017 BL30JPL Sentry16242029-211254.8e-06-4.10-4.110JPL: "Analysis based on 258 observations spanning 27.852 days (2017-Jan-28.37792 to 2017-Feb-25.22983)." Diameter approximately 0.072 km. from mean, weighted H=23.3.

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 25 February '17

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

2302Grabbed MPEC 2017-D78 - 2000 EM26 - see above
1846Generated Traffic Report
1706Noted that JPL Sentry has removed 2017 CA33 as an impact risk - see above
1624Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
Noted that JPL Sentry has removed 2017 BO32 as an impact risk - see above
1546Noted that NEODyS has updated its 2017 BW30 risk assessment - see above
Noted that NEODyS has updated its 2017 BY93 risk assessment - see above
Noted that NEODyS has updated its 2017 DG16 risk assessment - see above
Grabbed MPEC 2017-D76 - 2016 PT - see above
Grabbed MPEC 2017-D77 - Daily Orbit Update - see above
0642Grabbed MPEC 2017-D74 - 2017 DB36 - see above
Grabbed MPEC 2017-D75 - 2017 DC36 - see above
0616Grabbed MPEC 2017-D63 - 2017 DR35 - see above
Grabbed MPEC 2017-D64 - 2017 DS35 - see above
Grabbed MPEC 2017-D65 - 2017 DT35 - see above
Grabbed MPEC 2017-D66 - 2017 DU35 - see above
Grabbed MPEC 2017-D67 - 2017 DY35 - see above
Grabbed MPEC 2017-D68 - 2017 DV35 - see above
Grabbed MPEC 2017-D69 - 2017 DD36 - see above
Grabbed MPEC 2017-D70 - 2017 DW35 - see above
Grabbed MPEC 2017-D71 - 2017 DX35 - see above
Grabbed MPEC 2017-D72 - 2017 DZ35 - see above
Grabbed MPEC 2017-D73 - 2017 DA36 - see above
0507Grabbed MPEC 2017-D60 - 2017 DO35 - see above
Grabbed MPEC 2017-D61 - 2017 DP35 - see above
Grabbed MPEC 2017-D62 - 2017 DQ35 - see above