Contents  on 5 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 5 January '17

One object reported inside ten LD

One minor object is reported traveling less than ten lunar distances (LD) from our planet today. NHATS target 2016 YR is headed away from 8.43 to 8.70 LD. On approach next, risk-listed NHATS target 2016 YC8 will arrive inside ten LD on January 15th.

This report was generated at 1846 UTC with the discovery of 2017 AE3 (MPEC, DOU) announced late yesterday, and with follow-up in today's DOU MPEC for 2016 YC8.



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 5 January '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, 49 were "one nighters." So far The Tracking News has counted a total of 120 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 5 January '17

Minor Planet Electronic Circulars

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


MPEC 2017-A27 - "23:38 UT" - 2017 AY3


MPEC 2017-A26 - "23:35 UT" - 2017 AX3


MPEC 2017-A25 - "23:33 UT" - 2017 AW3


MPEC 2017-A24 - "23:30 UT" - 2017 AV3


MPEC 2017-A23 - "16:48 UT" - 2010 AG40


<< DOU on 5 Jan. '17 >>  MPEC 2017-A22 - "15:02 UT" - Daily Orbit Update


MPEC 2017-A21 - "14:46 UT" - 2016 DP


MPEC 2017-A20 - "04:16 UT" - 2017 AK3


MPEC 2017-A19 - "04:13 UT" - 2017 AJ3


MPEC 2017-A18 - "04:10 UT" - 2017 AH3


MPEC 2017-A17 - "04:07 UT" - 2017 AG3

Observers  on 5 January '17

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-A27 -- 2017 AY3
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2017-A18 -- 2017 AH3
T05ATLAS Haleakala in Hawaii, 15 in MPECs 2017-A22 & 2017-A27 -- 2017 AY3, 2016 PR8, 2014 AD17, 2008 UL90, 2007 AM, 96590, 35396, 34613, 262623, 203471, 13651, 5693, 3200, 2102, 1627
160Castelmartini Obs. in Italy, 24 in MPEC 2017-A22 -- 2016 PR8, 2014 AD17, 2013 EW27, 2009 BB11, 2008 UL90, 96590, 90075, 475665, 413002, 345705, 262623, 24445, 203471, 159608, 13651, 12538, 11398, 7341, 5693, 5626, 4179, 3352, 3103, 2102
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2017-A24, 2017-A25, 2017-A26 & 2017-A27 -- 2017 AY3, 2017 AX3, 2017 AW3, 2017 AV3
J95Great Shefford Obs. in England, 4 in MPECs 2017-A17, 2017-A18, 2017-A19 & 2017-A23 -- 2017 AJ3, 2017 AH3, 2017 AG3, 2010 AG40
Q622Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A27 -- 2017 AY3
Q625Cristovao Jacques in Brazil via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A27 -- 2017 AY3
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A27 -- 2017 AY3
568_Marco Micheli on Mauna Kea in Hawaii, 7 in MPECs 2017-A17, 2017-A18, 2017-A19, 2017-A20, 2017-A24, 2017-A25 & 2017-A26 -- 2017 AX3, 2017 AW3, 2017 AV3, 2017 AK3, 2017 AJ3, 2017 AH3, 2017 AG3
474Mt. John Obs. in New Zealand, 4 in MPECs 2017-A24, 2017-A25, 2017-A26 & 2017-A27 -- 2017 AY3, 2017 AX3, 2017 AW3, 2017 AV3
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2017-A22 & 2017-A23 -- 2017 AF3, 2016 WX9, 2010 AG40, 2000 CE59, 88213, 386298, 370702, 36017, 312956, 141018, 5693, 1916
J69North Obs. in England, 1 in MPEC 2017-A22 -- 2017 AE3
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-A22 -- 2017 AE3
Z48Northolt Branch Obs. 2 Shepherd's Bush in England, 2 in MPEC 2017-A22 -- 275611, 138859
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2017-A22 -- 2014 AD17, 34613, 22753
F51Pan-STARRS 1 (PS1) in Hawaii, 32 in MPECs 2017-A17, 2017-A18, 2017-A19, 2017-A20, 2017-A22, 2017-A24, 2017-A25 & 2017-A26 -- 2017 AX3, 2017 AW3, 2017 AV3, 2017 AK3, 2017 AJ3, 2017 AH3, 2017 AG3, 2016 YM1, 2016 WX9, 2016 VQ5, 2016 PO8, 2011 HR, 2010 NT1, 2009 QB35, 2009 EB1, 2007 RN7, 2006 WS1, 2002 XU66, 97725, 90075, 40263, 391275, 386298, 380981, 363790, 36017, 323300, 313809, 276409, 217807, 153951, 1916
B49Paus Obs. in Spain, 1 in MPEC 2017-A22 -- 2016 XD1
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 23 in MPEC 2017-A22 -- 2016 VY5, 2016 VT2, 2016 PZ66, 2016 OK1, 2016 AU8, 2011 YG6, 2011 LL2, 2008 UL90, 2006 UM, 2001 YE4, 96590, 452389, 378610, 326683, 275611, 12538, 7341, 5836, 5653, 4179, 3691, 3352, 2102
L04ROASTERR-1 in Romania, 1 in MPEC 2017-A22 -- 2016 UE101
204Schiaparelli Obs. in Italy, 2 in MPECs 2017-A18 & 2017-A27 -- 2017 AY3, 2017 AH3
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-A22 -- 2016 YZ10
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-A22 -- 2016 XH2
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2017-A22 & 2017-A23 -- 2016 YP, 2016 YM4, 2010 AG40
I52Steward Obs. Mt. Lemmon Station in Arizona, 10 in MPECs 2017-A22 & 2017-A23 -- 2016 YZ10, 2016 YY7, 2016 YT8, 2016 YS8, 2016 YQ8, 2016 YJ8, 2016 YH8, 2016 YB11, 2016 XH2, 2010 AG40
926Tenagra II Obs. in Arizona, 4 in MPECs 2017-A22, 2017-A26 & 2017-A27 -- 2017 AY3, 2017 AX3, 2016 YK, 2016 YH8
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPECs 2017-A21 & 2017-A22 -- 2016 YY, 2016 YP, 2016 YC8, 2016 DP
C51WISE in Earth polar orbit, 4 in MPEC 2017-A22 -- 2016 SH45, 2013 EW27, 2004 QD20, 378610
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 January '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 AK3JPL Sentry16322040-2081451.8e-05-4.43-4.720JPL: "Analysis based on 9 observations spanning 1.9835 days (2017-Jan-02.46805 to 2017-Jan-04.451504)." Diameter approximately 0.038 km. from mean, weighted H=24.7.
NEODyS16322040-2117591.47e-05-4.51-4.760NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2017-01-02.469 to 2017-01-04.452."
2016 YC8NEODyS22032045-209435.67e-10-9.26-9.510NEODyS: "Based on 66 optical observations (of which 0 are rejected as outliers) from 2016-12-27.359 to 2017-01-04.470."
2016 YM4NEODyS22032071-209833.28e-08-6.18-6.310NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2016-12-24.192 to 2017-01-05.285."
JPL Sentry1805R E M O V E DJPL #2 for the day: Risk listing removed at 1800 UTC.
2016 YYNEODyS2203210111.75e-09-9.08-9.080NEODyS: "Based on 42 optical observations (of which 4 are rejected as outliers) from 2016-12-18.153 to 2017-01-04.437."
JPL Sentry1805R E M O V E DJPL: Risk listing removed at 1800 UTC.
2016 YPNEODyS2203R 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 5 January '17

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

2358Grabbed MPEC 2017-A24 - 2017 AV3 - see above
Grabbed MPEC 2017-A25 - 2017 AW3 - see above
Grabbed MPEC 2017-A26 - 2017 AX3 - see above
Grabbed MPEC 2017-A27 - 2017 AY3 - see above
2203Noted that NEODyS has updated its 2016 YC8 risk assessment - see above
Noted that NEODyS has updated its 2016 YM4 risk assessment - see above
Noted that NEODyS has removed 2016 YP as an impact risk - see above
Noted that NEODyS has updated its 2016 YY risk assessment - see above
1846Generated Traffic Report
1805Noted that JPL Sentry has removed 2016 YM4 as an impact risk - see above
Noted that JPL Sentry has removed 2016 YY as an impact risk - see above
1710Grabbed MPEC 2017-A23 - 2010 AG40 - see above
1632Noted that JPL Sentry has posted 2017 AK3 as an impact risk - see above
Noted that NEODyS has posted 2017 AK3 as an impact risk - see above
Grabbed MPEC 2017-A21 - 2016 DP - see above
Grabbed MPEC 2017-A22 - Daily Orbit Update - see above
0500Grabbed MPEC 2017-A17 - 2017 AG3 - see above
Grabbed MPEC 2017-A18 - 2017 AH3 - see above
Grabbed MPEC 2017-A19 - 2017 AJ3 - see above
Grabbed MPEC 2017-A20 - 2017 AK3 - see above
0017Noted that JPL Sentry has updated its 2016 YM4 risk assessment - see above