Contents  on 26 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 26 February '17

Eleven objects reported inside ten LD

Eleven asteroidal objects are known to be traveling inside ten lunar distances (LD) of our planet today. Nearest is newly announced 2017 DV36, which slides in from 2.89 to 1.06 LD, entering Earth's sphere of gravitational influence (SOI). A lot further out, 2017 DS34 arrives within our ten-LD traffic reporting zone, moving in from 11.49 to 8.20 LD, while two other objects exit: radar target 2017 BY93 flies from 9.32 to 13.55 LD and NHATS target 2017 DB from 9.79 to 11.59 LD.

Earth passage I D ~Size Distance Today  Notes
0.36 LD Feb. 232017 DG16 4 m  3.15 to 4.61 LD intruder, NHATS target, risk
0.58 LD yesterday2017 DR34 5 m  2.11 to 4.60 LD intruder, exits Earth SOI
1.02 LD tomorrow2017 DV36 9 m  1.06 from 2.89 LD NEW, enters Earth SOI - MPEC
1.82 LD Feb. 202017 DB 13 m  9.79 to 11.59 LD exits ten LD, NHATS target - DOU
2.09 LD Feb. 192017 DF 16 m  8.13 to 9.27 LD NHATS target - DOU
2.37 LD Feb. 232017 BY93 79 m  9.32 to 13.55 LD exits ten LD, radar target
2.44 LD Feb. 242017 DT34 10 m  5.03 to 7.20 LD
2.49 LD Feb. 222017 DD36 15 m  6.88 to 8.69 LD DOU
3.58 LD Feb. 242017 CP1 40 m  3.92 to 4.43 LD radar/NHATS target
4.07 LD Feb. 282017 DJ16 24 m  6.25 from 8.30 LD NHATS target
7.12 LD tomorrow2017 DS34 24 m  8.20 from 11.49 LD enters ten LD

This report was generated at 2150 UTC. First, we note the recovery announced late yesterday of 2000 EM26 (MPEC), which was picked up beyond 74 LD. It had previously been calculated to pass Earth at 8.82 LD in February 2014, but was unobserved at that time. With the new data, that 2014 passage calculation is 14.27 LD, outside our traffic reporting zone. Next, we note the discoveries of 2017 DV36 (MPEC) and already departed 2017 DP36 (MPEC), which went by us at 1.53 LD on February 17th. And today's DOU MPEC has first follow-up for departed NHATS target 2017 DX34 and continuing follow-up for outbound 2017 DD36 and NHATS targets 2017 DF and 2017 DB; for approaching 2017 DA36 and radar target 2017 CS; for departed 2017 DV15, 2017 CP32, NHATS target 2017 DC36, and risk-listed NHATS/radar target 2016 TB57; and for distant 136617 1994 CC, plus astrometry from December for 2016 YH, NHATS target 2016 YR, and radar target 2016 XK18.

Approaching (sorted by 10-LD bubble entry date)
4.68 LD March 22012 DR32 41 m  < 10 LD Feb. 28
9.63 LD March 82017 DV35 12 m  < 10 LD March 5, NHATS target
4.05 LD March 102017 DA36 36 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
7.9   LD May 292017 CS 437 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. "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 26 February '17

The MPC's NEO Confirmation Page has 83 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 83 objects listed. Of these, 27 were "one nighters." So far The Tracking News has counted a total of 102 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 26 February '17

Minor Planet Electronic Circulars

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


<< DOU on 26 Feb. '17 >>  MPEC 2017-D90 - "13:05 UT" - Daily Orbit Update


MPEC 2017-D89 - "12:49 UT" - 2015 GZ45


MPEC 2017-D88 - "12:46 UT" - 2012 HN8


MPEC 2017-D87 - "12:44 UT" - 2013 LE16


MPEC 2017-D86 - "05:49 UT" - 2017 DV36


MPEC 2017-D85 - "05:38 UT" - 2017 DR36


MPEC 2017-D84 - "05:29 UT" - 2017 DU36


MPEC 2017-D83 - "05:24 UT" - 2017 DT36


MPEC 2017-D82 - "05:19 UT" - 2017 DS36


MPEC 2017-D81 - "05:14 UT" - 2017 DQ36


MPEC 2017-D80 - "05:08 UT" - 2017 DP36


MPEC 2017-D79 - "04:59 UT" - 2017 DO36

Observers  on 26 February '17

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-D83 -- 2017 DT36
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2017-D90 -- 2017 DF, 2017 DC, 2017 DB, 2016 YN4, 2011 WO41, 68346, 5653, 4055, 3103, 1627
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-D90 -- 2016 UU80, 11398, 3103
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-D86 -- 2017 DV36
300Bisei Spaceguard Center in Japan, 1 in MPEC 2017-D86 -- 2017 DV36
160Castelmartini Obs. in Italy, 2 in MPECs 2017-D86 & 2017-D90 -- 2017 DV36, 378610
703Catalina Sky Survey (CSS) in Arizona, 16 in MPECs 2017-D82 & 2017-D90 -- 2017 DS36, 2017 CR32, 2017 BU6, 2016 DP, 2013 YK148, 2011 WO41, 2008 EC69, 2006 UM, 2006 EC1, 89830, 54789, 479325, 448003, 326683, 226198, 3352
107Cavezzo Obs. in Italy, 4 in MPEC 2017-D90 -- 2011 WO41, 443103, 40267, 11398
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2017-D81 & 2017-D90 -- 2017 DU15, 2017 DQ36, 2017 DA36, 2017 CP32, 2017 CO, 2016 VC4
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-D86 -- 2017 DV36
958Dax Obs. in France, 1 in MPEC 2017-D86 -- 2017 DV36
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 6 in MPECs 2017-D80, 2017-D86, 2017-D87, 2017-D88 & 2017-D90 -- 2017 DV36, 2017 DP36, 2017 DD36, 2017 BL30, 2013 LE16, 2012 HN8
W46Foxfire Village Obs., 1 in MPEC 2017-D90 -- 11398
J95Great Shefford Obs. in England, 2 in MPECs 2017-D82 & 2017-D83 -- 2017 DT36, 2017 DS36
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2017-D90 -- 2017 DP35
K92LCOGT Sutherland B in South Africa, 2 in MPECs 2017-D81 & 2017-D82 -- 2017 DS36, 2017 DQ36
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2017-D79, 2017-D82, 2017-D84 & 2017-D86 -- 2017 DV36, 2017 DU36, 2017 DS36, 2017 DO36
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-D90 -- 2013 GL8
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-D90 -- 40267
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-D84 -- 2017 DU36
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2017-D90 -- 2017 DA36, 2017 CS
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-D81 -- 2017 DQ36
G96Mt. Lemmon Survey (MLS) in Arizona, 32 in MPECs 2017-D79, 2017-D80, 2017-D82, 2017-D83, 2017-D85, 2017-D86 & 2017-D90 -- 2017 DV36, 2017 DV15, 2017 DT36, 2017 DS36, 2017 DR36, 2017 DP36, 2017 DP34, 2017 DO36, 2017 DN34, 2017 BX6, 2017 BL123, 2017 BG85, 2016 VY3, 2013 AB53, 2012 DF61, 2010 HZ108, 2010 DP, 2007 ES, 2006 WS1, 2006 BX139, 2003 CR1, 2000 CE59, 39796, 354876, 34613, 315020, 308899, 154144, 136617, 10165, 9172, 7474
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2017-D90 -- 85275, 469356, 386298
C27Pallerols Obs. in Spain, 1 in MPEC 2017-D90 -- 2016 UU80
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPECs 2017-D81, 2017-D84, 2017-D85 & 2017-D90 -- 2017 DV15, 2017 DU36, 2017 DR36, 2017 DQ36, 2017 CG1, 2017 BL123, 2016 YM1, 2006 JZ25, 308899, 190161, 144898, 7480, 7474
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 16 in MPEC 2017-D90 -- 2017 DC36, 2017 CS, 2017 BL30, 2017 BG85, 2017 AC5, 2016 UU80, 2015 BY310, 2014 EW24, 2013 VC13, 2011 WO41, 2010 CM44, 2008 ER7, 2006 WS1, 2005 EY223, 2002 LS32, 2000 CE59
D29Purple Mtn. Obs. Xuyi Station in China, 4 in MPEC 2017-D90 -- 2003 CR1, 351545, 34613, 310842
L04ROASTERR-1 in Romania, 1 in MPEC 2017-D86 -- 2017 DV36
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-D86 & 2017-D90 -- 2017 DV36, 2017 DC36
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-D79 -- 2017 DO36
A29Santa Maria a Monte Obs. in Italy, 1 in MPEC 2017-D86 -- 2017 DV36
204Schiaparelli Obs. in Italy, 26 in MPECs 2017-D86 & 2017-D90 -- 2017 DV36, 2016 YR, 2016 YP, 2016 YH, 2016 YG, 2016 YE, 2016 XK18, 2016 XJ18, 2016 XD18, 2016 XA18, 2016 WV9, 2016 VY3, 2016 OK1, 2016 NT38, 2016 NL15, 2014 YC, 2014 XU6, 2014 EW24, 2011 YG6, 2011 WS2, 482796, 481817, 480922, 480883, 480823, 468583
G45Space Surveillance Telescope Atom Site in New Mexico, 1 in MPEC 2017-D82 -- 2017 DS36
691Spacewatch 0.9m telescope in Arizona, 16 in MPECs 2017-D80, 2017-D82, 2017-D85 & 2017-D90 -- 2017 DX34, 2017 DS36, 2017 DR36, 2017 DP36, 2017 BL30, 2017 BE92, 2016 XM, 2016 XD1, 2016 VV3, 2016 QC84, 2015 XY378, 2015 FJ36, 2013 RD32, 2008 EN6, 469356, 5131
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2017-D90 -- 2016 TH56, 2013 XB10
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2017-D86 -- 2017 DV36
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2017-D79, 2017-D80, 2017-D83 & 2017-D85 -- 2017 DT36, 2017 DR36, 2017 DP36, 2017 DO36
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 5 in MPECs 2017-D89 & 2017-D90 -- 2017 BN91, 2017 BL30, 2016 TB57, 2016 CO246, 2015 GZ45
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 DQ36NEODyS17002021-2117771.5e-07-3.37-3.890NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2017-02-22.240 to 2017-02-26.045."
JPL Sentry07252021-2116371.8e-07-3.21-3.600JPL: "Analysis based on 17 observations spanning 3.8045 days (2017-Feb-22.23938 to 2017-Feb-26.04384)." Diameter approximately 0.473 km. from mean, weighted H=19.3.
2017 CA33NEODyS0611R E M O V E D-
2017 BY93NEODyS0611R E M O V E D-
2017 BO32NEODyS0611R E M O V E D-
2017 BL30NEODyS23582029-2115154.18e-07-5.39-5.480NEODyS #2 for the day: "Based on 274 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-26.193."
JPL Sentry17352029-205227.9e-08-5.95-6.010JPL #2 for the day: "Analysis based on 274 observations spanning 28.815 days (2017-Jan-28.37792 to 2017-Feb-26.19258)." Diameter approximately 0.073 km. from mean, weighted H=23.3.
2016 TB57NEODyS23582098-211691.74e-08-8.82-8.940NEODyS: "Based on 121 optical observations (of which 2 are rejected as outliers) from 2016-09-12.527 to 2017-02-24.531."
JPL Sentry1632R E M O V E DJPL: Risk listing removed at 1611 UTC.
2011 YW10NEODyS0611R E M O V E D-

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 26 February '17

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

2358Noted that NEODyS has updated its 2016 TB57 risk assessment - see above
Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
2150Generated Traffic Report
1735Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
1700Noted that NEODyS has posted 2017 DQ36 as an impact risk - see above
1632Noted that JPL Sentry has removed 2016 TB57 as an impact risk - see above
1548Grabbed MPEC 2017-D87 - 2013 LE16 - see above
Grabbed MPEC 2017-D88 - 2012 HN8 - see above
Grabbed MPEC 2017-D89 - 2015 GZ45 - see above
Grabbed MPEC 2017-D90 - Daily Orbit Update - see above
0725Noted that JPL Sentry has posted 2017 DQ36 as an impact risk - see above
0611Noted that NEODyS has removed 2011 YW10 as an impact risk - see above
Noted that NEODyS has removed 2017 BO32 as an impact risk - see above
Noted that NEODyS has removed 2017 BY93 as an impact risk - see above
Noted that NEODyS has removed 2017 CA33 as an impact risk - see above
Grabbed MPEC 2017-D79 - 2017 DO36 - see above
Grabbed MPEC 2017-D80 - 2017 DP36 - see above
Grabbed MPEC 2017-D81 - 2017 DQ36 - see above
Grabbed MPEC 2017-D82 - 2017 DS36 - see above
Grabbed MPEC 2017-D83 - 2017 DT36 - see above
Grabbed MPEC 2017-D84 - 2017 DU36 - see above
Grabbed MPEC 2017-D85 - 2017 DR36 - see above
Grabbed MPEC 2017-D86 - 2017 DV36 - see above
0257Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
0103Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above