Contents  on 27 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 27 February '17

Nine objects reported inside ten LD

Nine visitors are reported to be within ten lunar distances (LD) of our planet today. Nearest is 2017 DV36, which comes its closest to Earth this time around, reaching 1.02 LD at 0257 UTC, and passes the Moon at 1.60 LD at 0922 UTC. Much further away, 2017 DS34 comes its closest to us on this passage -- 7.12 LD at 1948 UTC, and two objects leave our ten-LD traffic reporting radius: 2017 DD36 travels from 8.69 to 10.53 LD and NHATS target 2017 DF from 9.27 to 10.42 LD.

Earth passage I D ~Size Distance Today  Notes
0.36 LD Feb. 232017 DG16 4 m  4.61 to 6.07 LD intruder, NHATS target, risk
0.58 LD Feb. 252017 DR34 5 m  4.60 to 7.12 LD intruder
1.02 LD today2017 DV36 9 m  1.02 LD Earth closest at 0257 UTC, Moon closest 1.60 LD at 0922 UTC - DOU
2.09 LD Feb. 192017 DF 16 m  9.27 to 10.42 LD exits ten LD, NHATS target
2.44 LD Feb. 242017 DT34 10 m  7.20 to 9.46 LD
2.49 LD Feb. 222017 DD36 15 m  8.69 to 10.53 LD exits ten LD - DOU
3.58 LD Feb. 242017 CP1 40 m  4.43 to 5.09 LD radar/NHATS target
4.07 LD tomorrow2017 DJ16 23 m  4.66 from 6.26 LD NHATS target - DOU
7.12 LD today2017 DS34 24 m  7.12 LD Earth closest at 1948 UTC - DOU

This report was updated at 1907 UTC with first follow-up for 2017 DS34 and departed 2017 DU34 plus additional observation of 2017 DV36 in today's DOU MPEC, along with continuing follow-up for inbound NHATS target 2017 DJ16, outbound 2017 DD36, approaching NHATS target 2017 DV35, and departed NHATS targets 2017 DX34 and 2017 BW (also a radar target). Your first, preliminary traffic report was generated at 1632 UTC.

Approaching (sorted by 10-LD bubble entry date)
4.68 LD March 22012 DR32 41 m  < 10 LD tomorrow
4.05 LD March 102017 DA36 36 m  < 10 LD March 5, NHATS target
9.65 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
7.9   LD May 292017 CS 437 m  < 10 LD May 26, uncertainty +/- 17 mins., 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. 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 27 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 2358 UTC when the database was dated 27 Feb.

NEOCP Activity  on 27 February '17

The MPC's NEO Confirmation Page has 95 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 95 objects listed. Of these, 32 were "one nighters." So far The Tracking News has counted a total of 97 listings on the NEOCP today.

New MPECs  on 27 February '17

Minor Planet Electronic Circulars

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


MPEC 2017-D93 - "19:28 UT" - 2014 WV508


<< DOU on 27 Feb. '17 >>  MPEC 2017-D92 - "13:04 UT" - Daily Orbit Update


MPEC 2017-D91 - "03:49 UT" - 2016 EB195

Observers  on 27 February '17

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 8 in MPEC 2017-D92 -- 2017 DX35, 2017 DW35, 2017 DV35, 2017 DU34, 2017 DM34, 2017 DJ16, 2017 DD36, 2017 CR32
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2017-D92 -- 2017 DV36, 2017 AT4, 2017 AH13, 2016 YP4, 2016 XY23, 2015 UM67, 2013 CJ89, 2006 JZ25, 2004 SW55, 1998 TT3, 338049, 277279
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2017-D92 -- 2012 EP5
B66Casasco Obs. in Italy, 8 in MPEC 2017-D92 -- 2016 UU80, 90075, 68346, 22753, 13651, 12538, 5693, 4179
160Castelmartini Obs. in Italy, 13 in MPEC 2017-D92 -- 2017 BW, 2013 GL8, 2008 CA6, 2000 CE59, 53319, 40267, 370702, 143404, 7888, 5626, 5587, 5131, 4055
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPEC 2017-D92 -- 2017 DY35, 2017 DQ15, 2017 DL34, 2017 CW1, 2017 BW32, 2016 UJ101, 2016 RO1, 2015 FS332
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPEC 2017-D92 -- 2016 TK, 2016 QC84, 2012 EP5, 198752
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2017 BY93
6957William Romanishin in Oklahoma via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPECs 2017-D91 & 2017-D93 -- 2016 EB195, 2014 WV508
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-D92 -- 2017 DM34
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-D92 -- 40267
474Mt. John Obs. in New Zealand, 4 in MPEC 2017-D92 -- 2017 DX35, 2017 DT35, 2017 DS34, 2017 BJ92
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2017-D92 -- 2016 PR8, 5693
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPEC 2017-D92 -- 2016 UU80, 2013 GL8, 420286, 163693, 144411, 1916
W25RMS Obs., 4 in MPEC 2017-D92 -- 2017 DV36, 2017 BM123, 370702, 20255
H36Sandlot Obs. in Kansas, 4 in MPECs 2017-D91, 2017-D92 & 2017-D93 -- 2017 DR35, 2017 CN1, 2016 EB195, 2014 WV508
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2017-D92 -- 2017 DX34, 2017 DQ36, 2017 CN1, 2017 BL6, 2017 BL30, 2017 BG32, 2016 XD1, 2005 ES70, 2000 EM26
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2017-D92 -- 2017 DX15, 2017 BB94, 2016 YO3, 2015 FS332
W34Squirrel Valley Obs. in North Carolina, 2 in MPEC 2017-D92 -- 2011 WO41, 479325
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPEC 2017-D92 -- 2017 DX35, 2017 DW35, 2017 DV35, 2017 DT35, 2017 DP34, 2017 DM34, 2017 DJ34, 2017 BD29, 2016 XQ23
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-D92 -- 2017 BO32, 2017 BK92, 2011 EP51
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 Sentry18302021-2110362.2e-07-3.00-3.260JPL #2 for the day: "Analysis based on 20 observations spanning 4.8972 days (2017-Feb-22.23938 to 2017-Feb-27.13658)." Diameter approximately 0.474 km. from mean, weighted H=19.3.
NEODyS17032021-2117438.45e-08-3.83-4.680NEODyS: "Based on 20 optical observations (of which 2 are rejected as outliers) from 2017-02-22.240 to 2017-02-27.137."
2017 BL30JPL Sentry21302029-205223.3e-08-6.38-6.500JPL #2 for the day: "Analysis based on 277 observations spanning 29.835 days (2017-Jan-28.37792 to 2017-Feb-27.21319)." Diameter approximately 0.073 km. from mean, weighted H=23.3.
NEODyS17032029-2106144.07e-07-5.39-5.480NEODyS: "Based on 277 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-27.214."

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 27 February '17

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

2358Noted Radar Astrometry database update - see above
2130Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
1930Grabbed MPEC 2017-D93 - 2014 WV508 - see above
1907Updated Traffic Report
1830Noted that JPL Sentry has updated its 2017 DQ36 risk assessment - see above
1732Noted that JPL Sentry has updated its 2017 DQ36 risk assessment - see above
1703Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 DQ36 risk assessment - see above
1624Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
Grabbed MPEC 2017-D92 - Daily Orbit Update - see above
0510Grabbed MPEC 2017-D91 - 2016 EB195 - see above