Contents  on 23 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 23 February '17

Seven objects reported inside ten LD

There are seven visitors reported inside ten lunar distances (LD) of our planet today. Newly announced risk-listed intruder 2017 DG16 slides into the Earth-Moon system, coming in from 1.36 LD, passing us at 0.36 LD at 2107 UTC, and ending the day at 0.40 LD from Earth. And risk-listed radar target 2017 BY93 also comes its closest this time around, reaching 2.37 LD at 2159 UTC.

Earth passage I D ~Size Distance Today  Notes
0.36 LD today2017 DG16 5 m  0.36 LD NEW, intruder, risk, Earth closest at 2107 UTC - MPEC, DOU
1.82 LD Feb. 202017 DB 13 m  4.56 to 6.27 LD NHATS target
2.09 LD Feb. 192017 DF 16 m  4.78 to 5.88 LD NHATS target - DOU
2.37 LD today2017 BY93 82 m  2.37 LD enters Earth SOI, radar target, risk, Earth closest at 2159 UTC - DOU
3.58 LD tomorrow2017 CP1 40 m  3.61 from 3.87 LD radar/NHATS target - DOU
4.63 LD Feb. 172017 BW 69 m  8.02 to 8.94 LD radar/NHATS target
8.76 LD Feb. 212017 DV15 31 m  9.24 to 9.84 LD

Coming into the neighborhood next, new discovery 2017 DJ16 enters the ten LD space on February 25th.

Approaching (sorted by 10-LD bubble entry date)
4.07 LD Feb. 282017 DJ16 24 m  < 10 LD Feb. 25, NEW - MPEC
2.7   LD March 22012 DR32 41 m  < 10 LD Feb. 28, uncertainty +/- 4.1333 hours
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 +/- 22 mins.

This report was updated at 1848 UTC with additional observation of 2017 DG16 and first follow-up in today's DOU MPEC along with continuing follow-up for 2017 BY93, inbound radar/NHATS target 2017 CP1, outbound NHATS target 2017 DF, and departed objects 2017 DS15 and radar/NHATS target 2017 CF32, plus astrometry for risk-listed 2017 BE30. Your first local asteroid traffic report was generated at 0631 UTC with the discoveries of 2017 DJ16 (MPEC), 2017 DG16 (MPEC), and already departed 2017 DH16 (MPEC), which went by at 3.33 LD on February 17th.



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 23 February '17

The MPC's NEO Confirmation Page has 89 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 89 objects listed. Of these, 37 were "one nighters." So far The Tracking News has counted a total of 111 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 23 February '17

Minor Planet Electronic Circulars

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


<< DOU on 23 Feb. '17 >>  MPEC 2017-D37 - "14:01 UT" - Daily Orbit Update


MPEC 2017-D36 - "03:18 UT" - 2017 DG16


MPEC 2017-D35 - "03:05 UT" - 2017 DJ16


MPEC 2017-D34 - "02:59 UT" - 2017 DH16

Observers  on 23 February '17

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2017-D37 -- 2017 CP1, 2017 BP91, 2017 BL30, 2016 UU80, 90075, 68346, 370307
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2017-D37 -- 2017 DE, 2013 YK148, 2011 WO41, 2006 EC1, 349507, 226198, 5653
T08ATLAS Mauna Loa in Hawaii, 8 in MPEC 2017-D37 -- 2000 CE59, 90075, 413002, 22771, 10636, 5626, 3199, 1036
160Castelmartini Obs. in Italy, 24 in MPEC 2017-D37 -- 2017 DF, 2017 CP1, 2017 CF32, 2017 BY93, 2017 BM123, 2016 UU80, 2013 GL8, 2008 ER7, 2000 CE59, 54789, 40267, 370702, 310842, 13651, 11398, 10165, 5693, 5653, 5626, 5131, 4179, 4055, 3352, 3103
958Dax Obs. in France, 1 in MPEC 2017-D36 -- 2017 DG16
E10*program code "*" (19) via Faulkes Telescope South in New South Wales, 1 in MPEC 2017-D37 -- 2017 BL30
K88GINOP-KHK in Hungary, 2 in MPECs 2017-D34 & 2017-D35 -- 2017 DJ16, 2017 DH16
O75ISON Hureltogoot Obs. in Mongolia, 1 in MPEC 2017-D35 -- 2017 DJ16
H15ISON New Mexico Obs. in New Mexico, 2 in MPEC 2017-D37 -- 2017 AC5, 370702
Q60ISON Siding Spring Obs. in New South Wales, 1 in MPEC 2017-D37 -- 11066
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-D37 -- 2017 BL30
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-D37 -- 2017 BL30
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-D37 -- 2017 BL30
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2017-D34 & 2017-D37 -- 2017 DH16, 2017 DG16
108Montelupo Obs. in Italy, 2 in MPEC 2017-D37 -- 2017 CP1, 5653
474Mt. John Obs. in New Zealand, 6 in MPEC 2017-D37 -- 2017 DF, 2017 BP32, 2017 BJ92, 2017 AN19, 2015 BX310, 2002 FQ4
G96Mt. Lemmon Survey (MLS) in Arizona, 28 in MPECs 2017-D34, 2017-D35, 2017-D36 & 2017-D37 -- 2017 DJ16, 2017 DH16, 2017 DG16, 2017 DE, 2017 CH1, 2017 CG1, 2017 BK123, 2017 BF30, 2016 YM1, 2016 QC84, 2016 PR8, 2013 KY1, 2012 UR136, 2011 QP96, 420286, 38086, 378610, 317255, 234061, 217807, 212359, 154988, 152671, 144411, 10115, 5646, 5189, 1916
F51Pan-STARRS 1 (PS1) in Hawaii, 31 in MPEC 2017-D37 -- 2017 DS15, 2017 CO5, 2017 BF30, 2016 WP48, 2016 VQ5, 2016 UU80, 2013 AX52, 2008 ER7, 2005 YV55, 2004 BD68, 2000 SL, 1998 HK1, 65803, 457059, 432226, 405427, 40267, 381906, 374038, 363069, 361532, 36017, 274138, 22771, 162063, 144898, 138846, 11398, 5626, 2329, 1916
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 11 in MPEC 2017-D37 -- 2017 BL30, 2011 WO41, 2005 EY223, 2002 LS32, 2001 QE34, 96590, 443103, 349507, 252558, 152931, 12538
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-D36 -- 2017 DG16
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-D34 -- 2017 DH16
Y00SONEAR in Brazil, 1 in MPEC 2017-D37 -- 2017 CP1
G45Space Surveillance Telescope Atom Site (SST Atom Site) in New Mexico, 2 in MPEC 2017-D37 -- 2017 CF32, 2016 YM1
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2017-D35 & 2017-D37 -- 2017 DT15, 2017 DR15, 2017 DJ16, 317255
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPECs 2017-D34, 2017-D35 & 2017-D36 -- 2017 DJ16, 2017 DH16, 2017 DG16
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-D37 -- 2017 BO32, 2017 BL30, 2017 BE30
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 DG16NEODyS18312072-2105457.8e-05-6.48-6.510NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2017-02-21.237 to 2017-02-22.923."
JPL Sentry18062074-2105231.1e-04-6.32-6.370JPL #2 for the day: "Analysis based on 30 observations spanning 1.9019 days (2017-Feb-21.23575 to 2017-Feb-23.137655)." Diameter approximately 0.005 km. from mean, weighted H=29.3.
2017 BY93NEODyS1831207011.15e-08-6.84-6.840NEODyS #2 for the day: "Based on 138 optical observations (of which 1 are rejected as outliers) from 2017-01-26.500 to 2017-02-21.521."
2017 BO32NEODyS18312072-2101373.44e-06-5.68-6.060NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2017-01-29.398 to 2017-02-05.104."
JPL Sentry17302072-2092252.5e-06-5.61-5.930JPL: "Analysis based on 19 observations spanning 6.7060 days (2017-Jan-29.39721 to 2017-Feb-05.103182)." Diameter approximately 0.041 km. from mean, weighted H=24.6.
2017 BL30JPL Sentry20002029-205245.8e-06-3.98-3.980JPL #2 for the day: "Analysis based on 239 observations spanning 26.139 days (2017-Jan-28.37792 to 2017-Feb-23.51726)." Diameter approximately 0.073 km. from mean, weighted H=23.3.
NEODyS18312029-2109153.54e-05-3.18-3.180NEODyS #2 for the day: "Based on 239 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-02-23.518."
2017 BE30JPL Sentry1730210011.0e-07-7.70-7.700JPL: "Analysis based on 27 observations spanning 5.8769 days (2017-Jan-27.53064 to 2017-Feb-02.407498)." Diameter approximately 0.018 km. from mean, weighted H=26.3.

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 23 February '17

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

2000Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
1848Updated Traffic Report
1831Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 BO32 risk assessment - see above
Noted that NEODyS has updated its 2017 BY93 risk assessment - see above
Noted that NEODyS has posted 2017 DG16 as an impact risk - see above
1806Noted that JPL Sentry has updated its 2017 DG16 risk assessment - see above
1730Noted that JPL Sentry has updated its 2017 BE30 risk assessment - see above
Noted that JPL Sentry has updated its 2017 BL30 risk assessment - see above
Noted that JPL Sentry has updated its 2017 BO32 risk assessment - see above
1654Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has updated its 2017 BY93 risk assessment - see above
Grabbed MPEC 2017-D37 - Daily Orbit Update - see above
0525Noted that JPL Sentry has posted 2017 DG16 as an impact risk - see above
Grabbed MPEC 2017-D34 - 2017 DH16 - see above
Grabbed MPEC 2017-D35 - 2017 DJ16 - see above
Grabbed MPEC 2017-D36 - 2017 DG16 - see above