Contents  on 9 January '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 9 January '17

Five objects reported inside ten LD

Between 0705 and 1833 UTC today (that's 2:05am to 1:33pm EST), asteroid 2017 AG13 was closer to you than is the Moon. It started the day at 1.95 lunar distances (LD), came its closest at 1249 UTC -- 0.54 LD, and will be moving away harmlessly at 1.72 LD at day's end. Of unknown composition, this object is perhaps two-thirds the size of the metal asteroid that put the impressive hole in Arizona known as Barringer Crater.

There are four other asteroids reported traveling within ten lunar distances (LD) of Earth today, of which risk-listed 2017 AS4 is the closest. It exits Earth's SOI (sphere of gravitational influence), moving out from 1.89 to 5.54 LD.

Earth passage I D ~Size Distance Today  Notes
0.54 LD today2017 AG13 21 m  0.54 LD intruder today, Moon closest 1.38 LD at 1035 UTC, Earth closest at 1249 UTC - DOU
1.29 LD Jan. 72017 AZ3 3 m  2.75 to 3.93 LD NHATS target
1.46 LD yesterday2017 AS4 16 m  1.89 to 5.54 LD exits Earth SOI, risk
2.81 LD Jan. 62017 AF13 17 m  5.52 to 6.94 LD
7.16 LD Dec. 272016 YR 12 m  9.58 to 9.90 LD NHATS target
Approaching
6.71 LD Jan. 142017 AJ13 50 m  < 10 LD Jan. 11
7.10 LD Feb. 52013 FK 74 m  < 10 LD Feb. 2
9.1   LD Feb. 42005 VL1 13 m  < 10 LD Feb. 1, uncertainty +/- 15.0000 hours, NHATS target
9.46 LD Jan. 182016 YC8 41 m  < 10 LD Jan. 16, NHATS target

This report was updated at 2020 UTC with the first follow-up for 2017 AG13 and the recovery of large and distant 2007 DT103 in today's DOU MPEC, along with observation of six departed objects: first follow-up for 2017 AK13, 2017 AO4, and risk-listed 2017 AP4, plus continuing follow-up for 2017 AE3, NHATS target 2017 AG5, and risk-listed 2016 TB57 (59.98-day observing arc extended by 43.14 days).
        We also note that we missed the discovery of risk-listed 2016 YC13, which was announced in the DOU of January 7th. It was tracked for 2.64 hours by three observatories in Arizona and New Mexico late last month after passing Earth at about 5.8 LD* on December 21st.
        Your first neighborhood flying rocks traffic report was generated at 0538 UTC.



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 now so close. Object distances are derived by A/CC from JPL Horizons data. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 9 January '17

The MPC's NEO Confirmation Page has 71 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 71 objects listed. Of these, 35 were "one nighters." So far The Tracking News has counted a total of 90 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 9 January '17

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been eight MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-A71 - "16:32 UT" - 2017 AB14


MPEC 2017-A70 - "16:29 UT" - 2017 AA14


MPEC 2017-A69 - "16:25 UT" - 2017 AZ13


MPEC 2017-A68 - "16:22 UT" - 2017 AY13


MPEC 2017-A67 - "16:20 UT" - 2017 AX13


<< DOU on 9 Jan. '17 >>  MPEC 2017-A66 - "13:05 UT" - Daily Orbit Update


MPEC 2017-A65 - "03:26 UT" - 2017 AP13


MPEC 2017-A64 - "03:23 UT" - 2017 AO13

Observers  on 9 January '17

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-A69 -- 2017 AZ13
H21Astronomical Research Obs. Westfield in Illinois, 4 in MPECs 2017-A64, 2017-A65, 2017-A70 & 2017-A71 -- 2017 AP13, 2017 AO13, 2017 AB14, 2017 AA14
T05ATLAS Haleakala in Hawaii, 10 in MPEC 2017-A66 -- 2017 AG5, 2017 AF5, 2016 NL15, 2011 WO41, 96590, 378610, 13651, 5693, 2102, 1627
300Bisei Spaceguard Center in Japan, 1 in MPEC 2017-A66 -- 2017 AK13
Z84Calar Alto Schmidt in Spain, 2 in MPECs 2017-A64 & 2017-A70 -- 2017 AO13, 2017 AA14
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2017-A64 & 2017-A66 -- 2017 AO13, 2014 AD17, 475665, 413002, 141018, 11398, 3103
K51Celado Obs. in Italy, 3 in MPECs 2017-A64, 2017-A65 & 2017-A66 -- 2017 AP13, 2017 AO13, 2017 AM13
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-A68 -- 2017 AY13
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-A66 -- 2017 AO13
958Dax Obs. in France, 1 in MPEC 2017-A64 -- 2017 AO13
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-A64 -- 2017 AO13
Q60ISON Siding Spring Obs. in New South Wales, 1 in MPEC 2017-A66 -- 68346
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 15 in MPECs 2017-A66 & 2017-A67 -- 2017 AX13, 2017 AP4, 2017 AM4, 2017 AC5, 2016 XY23, 2016 WG10, 2016 QJ44, 2014 YQ15, 2011 WN15, 2011 LL2, 2007 LE, 2007 DT103, 2006 KQ1, 2006 CY10, 2001 SQ263
130Lumezzane Obs. in Italy, 2 in MPEC 2017-A66 -- 97725, 152563
K30Luscherz Obs. in Switzerland, 1 in MPEC 2017-A66 -- 2017 AK13
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-A66 -- 13651
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPECs 2017-A67 & 2017-A68 -- 2017 AY13, 2017 AX13
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-A68 -- 2017 AY13
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2017-A65, 2017-A66, 2017-A70 & 2017-A71 -- 2017 AP13, 2017 AG13, 2017 AB14, 2017 AA14, 2016 YY7, 2016 YV8, 2016 PR8, 2015 BV92, 470510, 22753, 9172
C23Olmen Obs. in Belgium, 1 in MPEC 2017-A66 -- 2017 AE3
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2017-A66, 2017-A67, 2017-A68 & 2017-A69 -- 2017 AZ13, 2017 AY13, 2017 AX13, 2016 WS9, 2016 WF9, 474163, 248083
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 11 in MPEC 2017-A66 -- 2017 AG5, 2016 YT8, 2016 NL15, 2008 UL90, 2006 UM, 96590, 347813, 4179, 3352, 2102, 433
K80Platanus Obs., 1 in MPEC 2017-A66 -- 2017 AG5
A48Povegliano Veronese Obs. in Italy, 3 in MPEC 2017-A66 -- 2017 AG5, 2016 YZ10, 2016 UE101
W25RMS Obs., 2 in MPEC 2017-A66 -- 262623, 138859
K33San Defendente Obs. in Italy, 1 in MPEC 2017-A66 -- 2017 AK13
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-A66 -- 2016 YF11
587Sormano Obs. in Italy, 1 in MPEC 2017-A66 -- 2017 AO4
691Spacewatch 0.9m telescope in Arizona, 15 in MPECs 2017-A66 & 2017-A69 -- 2017 AZ13, 2016 YO3, 2016 SH45, 2016 LE9, 2016 AU8, 2010 QE2, 2009 BB11, 2001 YE4, 474611, 414960, 385186, 22753, 226554, 163902, 1863
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2017-A66, 2017-A67 & 2017-A69 -- 2017 AZ13, 2017 AX3, 2017 AX13, 2016 WF9, 2016 PQ8, 2016 ND1, 2016 LV8, 2009 WK6, 226554
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2017-A64 -- 2017 AO13
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2017-A65, 2017-A66, 2017-A70 & 2017-A71 -- 2017 AP13, 2017 AK13, 2017 AB14, 2017 AA14
926Tenagra II Obs. in Arizona, 3 in MPECs 2017-A66 & 2017-A70 -- 2017 AT4, 2017 AA14, 2016 YU8
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-A66 -- 2016 XY23, 2016 WS9, 2016 TB57
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2017-A66 -- 2017 AG5, 326683, 2102
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 January '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 AP4JPL Sentry1646211514.1e-07-7.69-7.690JPL: "Analysis based on 12 observations spanning 4.8619 days (2017-Jan-04.48647 to 2017-Jan-09.34838)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
NEODyS1646211514.03e-07-7.69-7.690NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2017-01-04.487 to 2017-01-09.349."
2017 AM4JPL Sentry16462024-2116331.6e-06-1.73-1.740JPL: "Analysis based on 24 observations spanning 5.7923 days (2017-Jan-03.5207 to 2017-Jan-09.313)." Diameter approximately 0.520 km. from mean, weighted H=19.1.
NEODyS16462024-205221.11e-06-1.79-1.790NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2017-01-03.521 to 2017-01-09.314."
2016 TB57JPL Sentry17122104-211227.4e-08-8.18-8.390JPL #2 for the day: "Analysis based on 115 observations spanning 103.12 days (2016-Sep-12.526234 to 2016-Dec-24.650943)." Diameter approximately 0.020 km. from mean, weighted H=26.1.

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 9 January '17

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

2020Updated Traffic Report
1712Noted that JPL Sentry has reposted 2016 TB57 as an impact risk - see above
1646Noted that JPL Sentry has removed 2016 TB57 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 AM4 risk assessment - see above
Noted that NEODyS has updated its 2017 AM4 risk assessment - see above
Noted that JPL Sentry has updated its 2017 AP4 risk assessment - see above
Noted that NEODyS has updated its 2017 AP4 risk assessment - see above
Grabbed MPEC 2017-A66 - Daily Orbit Update - see above
Grabbed MPEC 2017-A67 - 2017 AX13 - see above
Grabbed MPEC 2017-A68 - 2017 AY13 - see above
Grabbed MPEC 2017-A69 - 2017 AZ13 - see above
Grabbed MPEC 2017-A70 - 2017 AA14 - see above
Grabbed MPEC 2017-A71 - 2017 AB14 - see above
0422Grabbed MPEC 2017-A64 - 2017 AO13 - see above
Grabbed MPEC 2017-A65 - 2017 AP13 - see above