Contents  on 7 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 7 January '17

Three objects reported inside ten LD

There are three visitors known to be within ten lunar distances (LD) of Earth today. Inside Earth's sphere of gravitational influence (SOI), NHATS target 2017 AZ3 comes its closest to our planet on this passage, reaching 1.29 LD at 0252 UTC. Much further away, newly announced 2017 AS4 is inbound from 7.24 to 3.29 LD and NHATS target 2016 YR is outbound from 8.98 to 9.27 LD.

This report was updated at 2342 UTC with the discoveries of already departed 2017 AH5 (MPEC), which had an 8.2 LD* flyby on December 26th, and 2017 AG5 (MPEC) -- 4.57 LD on December 30th.
        Previously this report was updated at 1940 UTC with first follow-up for 2017 AS4 and 2017 AZ3 in today's DOU MPEC along with follow-up for departed 2017 AE3.
        Your first A/CC nearby asteroids traffic report was generated at 0456 UTC with three discoveries: 2017 AS4 (MPEC) and two already departed objects: risk-listed 2017 AP4 (MPEC), which passed Earth at 2.24 LD on January 1st, and 2017 AO4 (MPEC from late yesterday), which flew by at 5.70 LD on December 26th.



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. "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 7 January '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, 44 were "one nighters." So far The Tracking News has counted a total of 107 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 7 January '17

Minor Planet Electronic Circulars

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


MPEC 2017-A53 - "20:57 UT" - 2017 AF5


MPEC 2017-A52 - "20:54 UT" - 2017 AC5


MPEC 2017-A51 - "20:34 UT" - 2017 AH5


MPEC 2017-A50 - "20:31 UT" - 2017 AG5


MPEC 2017-A49 - "20:27 UT" - 2017 AE5


MPEC 2017-A48 - "20:24 UT" - 2017 AD5


<< DOU on 7 Jan. '17 >>  MPEC 2017-A47 - "13:05 UT" - Daily Orbit Update


MPEC 2017-A46 - "03:12 UT" - 2016 NF22


MPEC 2017-A45 - "00:15 UT" - 2017 AT4


MPEC 2017-A44 - "00:11 UT" - 2017 AS4


MPEC 2017-A43 - "00:08 UT" - 2017 AR4


MPEC 2017-A42 - "00:05 UT" - 2017 AQ4


MPEC 2017-A41 - "00:01 UT" - 2017 AP4

Observers  on 7 January '17

A total of 63 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 1 in MPEC 2017-A52 -- 2017 AC5
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2017-A47 -- 2016 XH2, 2016 WS, 2016 NL15, 2014 UU34, 2006 UM, 433
T05ATLAS Haleakala in Hawaii, 3 in MPECs 2017-A47 & 2017-A53 -- 2017 AF5, 2017 AE3, 2005 TF
C77Bernezzo Obs. in Italy, 2 in MPECs 2017-A45 & 2017-A50 -- 2017 AT4, 2017 AG5
I58Betera Obs., 1 in MPEC 2017-A50 -- 2017 AG5
300Bisei Spaceguard Center in Japan, 2 in MPECs 2017-A50 & 2017-A53 -- 2017 AG5, 2017 AF5
B96Brixiis Obs. in Belgium, 1 in MPEC 2017-A50 -- 2017 AG5
160Castelmartini Obs. in Italy, 19 in MPECs 2017-A44, 2017-A45, 2017-A47, 2017-A50 & 2017-A53 -- 2017 AT4, 2017 AS4, 2017 AG5, 2017 AF5, 2016 PR8, 468583, 414960, 413002, 357024, 35396, 262623, 203471, 159608, 138846, 5693, 5626, 5131, 3103, 1627
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2017-A47 -- 22753, 203217, 159608, 5131, 3200, 1862
107Cavezzo Obs. in Italy, 7 in MPECs 2017-A47, 2017-A50 & 2017-A53 -- 2017 AG5, 2017 AF5, 2014 AD17, 2005 TF, 203471, 138859, 2102
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-A46 -- 2016 NF22
K65Cesena Obs. in Italy, 1 in MPEC 2017-A47 -- 2016 PZ66
K26Contern Obs. in Luxembourg, 1 in MPEC 2017-A50 -- 2017 AG5
958Dax Obs. in France, 1 in MPEC 2017-A50 -- 2017 AG5
I57Elche Obs. in Spain, 1 in MPEC 2017-A50 -- 2017 AG5
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2017-A45, 2017-A50 & 2017-A53 -- 2017 AT4, 2017 AG5, 2017 AF5
203GiaGa Obs. in Italy, 3 in MPECs 2017-A44, 2017-A45 & 2017-A50 -- 2017 AT4, 2017 AS4, 2017 AG5
J95Great Shefford Obs. in England, 5 in MPECs 2017-A41, 2017-A48, 2017-A49, 2017-A50 & 2017-A53 -- 2017 AP4, 2017 AG5, 2017 AF5, 2017 AE5, 2017 AD5
C43Hoyerswerda Obs. in Germany, 2 in MPECs 2017-A45 & 2017-A50 -- 2017 AT4, 2017 AG5
Q60ISON Siding Spring Obs. in New South Wales, 1 in MPEC 2017-A47 -- 141056
I89'Steven M. Tilley in Louisiana via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2017-A53 -- 2017 AF5
I89*Marian Urbanik in Slovakia via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2017-A50 -- 2017 AG5
I894M. Suzuki in Japan via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2017-A50 -- 2017 AG5
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A47 -- 2017 AY3
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-A47 -- 1998 YW5
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 12 in MPEC 2017-A47 -- 2017 AK3, 2016 YW7, 2016 YM4, 2016 XP23, 2016 XE2, 2016 VK6, 2016 UB42, 2014 LX14, 2012 TP139, 2011 RF, 2008 EL6, 1998 WP7
J67La Puebla de Vallbona Obs. in Spain, 1 in MPEC 2017-A50 -- 2017 AG5
B33Libbiano Obs. in Italy, 1 in MPEC 2017-A47 -- 2005 TF
K30Luscherz Obs. in Switzerland, 3 in MPECs 2017-A44, 2017-A47 & 2017-A50 -- 2017 AS4, 2017 AG5, 2016 YN4
K38M57 Obs. in Italy, 1 in MPEC 2017-A50 -- 2017 AG5
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-A47 -- 2016 YC13
K32Maritime Alps Obs. in Italy, 1 in MPEC 2017-A50 -- 2017 AG5
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-A47 -- 226198
118Modra Obs. in Slovakia, 1 in MPEC 2017-A50 -- 2017 AG5
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-A47 -- 2017 AD3
G96Mt. Lemmon Survey (MLS) in Arizona, 18 in MPECs 2017-A42, 2017-A43, 2017-A44, 2017-A45, 2017-A47, 2017-A48, 2017-A49, 2017-A50 & 2017-A51 -- 2017 AT4, 2017 AS4, 2017 AR4, 2017 AQ4, 2017 AH5, 2017 AG5, 2017 AE5, 2017 AD5, 2016 YC13, 52761, 467309, 455659, 382875, 208617, 194268, 159608, 153220, 10860
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-A50 -- 2017 AG5
C23Olmen Obs. in Belgium, 1 in MPEC 2017-A50 -- 2017 AG5
J43Oukaimeden Obs. in Morocco, 5 in MPEC 2017-A47 -- 2016 LM8, 455659, 312956, 162000, 13651
C27Pallerols Obs. in Spain, 1 in MPEC 2017-A50 -- 2017 AG5
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2017-A41, 2017-A42, 2017-A47 & 2017-A52 -- 2017 AQ4, 2017 AP4, 2017 AC5, 2015 XT168, 2014 AD17, 2011 LL2, 326683, 303933
K63Pascoli Obs. in Italy, 2 in MPECs 2017-A50 & 2017-A53 -- 2017 AG5, 2017 AF5
B49Paus Obs. in Spain, 1 in MPEC 2017-A50 -- 2017 AG5
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 4 in MPECs 2017-A43, 2017-A44, 2017-A50 & 2017-A51 -- 2017 AS4, 2017 AR4, 2017 AH5, 2017 AG5
L04ROASTERR-1 in Romania, 1 in MPEC 2017-A50 -- 2017 AG5
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2017-A50 -- 2017 AG5
K33San Defendente Obs. in Italy, 1 in MPEC 2017-A50 -- 2017 AG5
104San Marcello Pistoiese Obs. in Italy, 4 in MPECs 2017-A44, 2017-A45, 2017-A50 & 2017-A53 -- 2017 AT4, 2017 AS4, 2017 AG5, 2017 AF5
H36Sandlot Obs. in Kansas, 2 in MPECs 2017-A50 & 2017-A53 -- 2017 AG5, 2017 AF5
204Schiaparelli Obs. in Italy, 4 in MPECs 2017-A45, 2017-A48, 2017-A50 & 2017-A53 -- 2017 AT4, 2017 AG5, 2017 AF5, 2017 AD5
510Siegen Obs. in Germany, 1 in MPEC 2017-A50 -- 2017 AG5
W887program code 7 via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-A47 -- 2017 AY3
Y00SONEAR in Brazil, 1 in MPEC 2017-A50 -- 2017 AG5
587Sormano Obs. in Italy, 5 in MPECs 2017-A43, 2017-A44, 2017-A45, 2017-A50 & 2017-A53 -- 2017 AT4, 2017 AS4, 2017 AR4, 2017 AG5, 2017 AF5
G45Space Surveillance Telescope Atom Site (SST Atom Site) in New Mexico, 20 in MPECs 2017-A47 & 2017-A50 -- 2017 AG5, 2016 YN4, 2016 WX9, 2016 PN38, 2016 NL15, 2014 AZ51, 2011 WO41, 2009 BB11, 2005 TF, 413002, 357024, 307070, 25916, 252558, 153201, 13651, 108519, 5693, 5131, 1627
691Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2017-A47, 2017-A48 & 2017-A49 -- 2017 AE5, 2017 AD5, 2011 BH10
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2017-A47, 2017-A48 & 2017-A52 -- 2017 AD5, 2017 AC5, 2016 YJ4, 2016 WF9
I93St. Pardon de Conques Obs. in France, 7 in MPECs 2017-A43, 2017-A44, 2017-A45, 2017-A48, 2017-A49, 2017-A50 & 2017-A53 -- 2017 AT4, 2017 AS4, 2017 AR4, 2017 AG5, 2017 AF5, 2017 AE5, 2017 AD5
I52Steward Obs. Mt. Lemmon Station in Arizona, 15 in MPECs 2017-A42, 2017-A43, 2017-A44, 2017-A45, 2017-A47, 2017-A48, 2017-A49, 2017-A50, 2017-A51 & 2017-A53 -- 2017 AT4, 2017 AS4, 2017 AR4, 2017 AQ4, 2017 AJ3, 2017 AH5, 2017 AG5, 2017 AF5, 2017 AF3, 2017 AE5, 2017 AE3, 2017 AD5, 2016 YU10, 2016 YC13, 2016 YB11
926Tenagra II Obs. in Arizona, 16 in MPECs 2017-A41, 2017-A42, 2017-A43, 2017-A44, 2017-A45, 2017-A47, 2017-A48, 2017-A49, 2017-A50, 2017-A51 & 2017-A53 -- 2017 AZ3, 2017 AT4, 2017 AS4, 2017 AR4, 2017 AQ4, 2017 AP4, 2017 AJ3, 2017 AH5, 2017 AH3, 2017 AG5, 2017 AF5, 2017 AF3, 2017 AE5, 2017 AD5, 2016 YS8, 85990
Z98TRZ Obs., 1 in MPEC 2017-A50 -- 2017 AG5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-A47 -- 2016 YZ
C44Volta Obs. in Italy, 2 in MPECs 2017-A50 & 2017-A53 -- 2017 AG5, 2017 AF5
718Wiggins Obs. in Utah, 1 in MPEC 2017-A50 -- 2017 AG5
C42Xingming Obs. in China, 1 in MPEC 2017-A50 -- 2017 AG5
J08Zonalunar Obs. in Spain, 1 in MPEC 2017-A50 -- 2017 AG5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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 AP4NEODyS1650211512.48e-07-7.98-7.980NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2017-01-04.487 to 2017-01-06.320."
JPL Sentry0211211513.1e-07-7.88-7.880JPL: "Analysis based on 9 observations spanning 1.8327 days (2017-Jan-04.48647 to 2017-Jan-06.31918)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
2017 AM4NEODyS16502019-210832.73e-07-2.43-2.440NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2017-01-03.522 to 2017-01-06.232."
JPL Sentry02112024-2107141.1e-06-2.01-2.300JPL: "Analysis based on 21 observations spanning 2.7103 days (2017-Jan-03.5207 to 2017-Jan-06.23096)." Diameter approximately 0.500 km. from mean, weighted H=19.2.
2017 AK3NEODyS21112040-2082182.04e-05-4.42-4.750NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2017-01-02.469 to 2017-01-07.489."
JPL Sentry16502040-208182.3e-05-4.37-4.520JPL: "Analysis based on 12 observations spanning 5.0206 days (2017-Jan-02.46805 to 2017-Jan-07.48865)." Diameter approximately 0.038 km. from mean, weighted H=24.7.
2016 YC13JPL Sentry17302098-211023.2e-10-10.52-10.80JPL: "Analysis based on 19 observations spanning .11002 days (2016-Dec-27.28622 to 2016-Dec-27.396239)." Diameter approximately 0.015 km. from mean, weighted H=26.7.
2016 YM4NEODyS2000R E M O V E D-
2016 YJ4JPL Sentry1650R E M O V E DJPL: Risk listing removed at 1600 UTC.
2016 XP23NEODyS2000R E M O V E D-
JPL Sentry1650R E M O V E DJPL: Risk listing removed at 1559 UTC.

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 7 January '17

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

2342Updated Traffic Report
2111Noted that NEODyS has updated its 2017 AK3 risk assessment - see above
Grabbed MPEC 2017-A48 - 2017 AD5 - see above
Grabbed MPEC 2017-A49 - 2017 AE5 - see above
Grabbed MPEC 2017-A50 - 2017 AG5 - see above
Grabbed MPEC 2017-A51 - 2017 AH5 - see above
Grabbed MPEC 2017-A52 - 2017 AC5 - see above
Grabbed MPEC 2017-A53 - 2017 AF5 - see above
2000Noted that NEODyS has removed 2016 XP23 as an impact risk - see above
Noted that NEODyS has removed 2016 YM4 as an impact risk - see above
1730Noted that JPL Sentry has posted 2016 YC13 as an impact risk - see above
1650Noted that JPL Sentry has removed 2016 XP23 as an impact risk - see above
Noted that JPL Sentry has removed 2016 YJ4 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 AK3 risk assessment - see above
Noted that NEODyS has posted 2017 AM4 as an impact risk - see above
Noted that NEODyS has posted 2017 AP4 as an impact risk - see above
Grabbed MPEC 2017-A47 - Daily Orbit Update - see above
0410Grabbed MPEC 2017-A46 - 2016 NF22 - see above
0211Noted that JPL Sentry has posted 2017 AM4 as an impact risk - see above
Noted that JPL Sentry has posted 2017 AP4 as an impact risk - see above
0022Grabbed MPEC 2017-A41 - 2017 AP4 - see above
Grabbed MPEC 2017-A42 - 2017 AQ4 - see above
Grabbed MPEC 2017-A43 - 2017 AR4 - see above
Grabbed MPEC 2017-A44 - 2017 AS4 - see above
Grabbed MPEC 2017-A45 - 2017 AT4 - see above