Contents  on 16 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 16 January '17

Two objects reported inside ten LD

There are two minor objects reported passing inside ten lunar distances (LD) of Earth today. 2017 AJ13 is outbound from 7.66 to 9.06 LD and NHATS target 2016 YC8 enters our ten-LD traffic reporting "bubble," coming in from 10.02 to 9.64 LD. No other objects are currently known to come this close until February 1st.

This report was generated at 1940 UTC with follow-up in today's DOU MPEC for 2017 AJ13 and, from late December, risk-listed 2016 WQ1.

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 16 January '17

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2324 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, eight were "one nighters." The Tracking News counted a total of 54 listings on the NEOCP on this day.

New MPECs  on 16 January '17

Minor Planet Electronic Circulars

There were four MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2017-B04 - "23:56 UT" - 2017 AP19

MPEC 2017-B03 - "23:53 UT" - 2017 AO19

MPEC 2017-B02 - "23:49 UT" - 2017 AN19

<< DOU on 16 Jan. '17 >>  MPEC 2017-B01 - "13:03 UT" - Daily Orbit Update

Observers  on 16 January '17

A total of 23 observers appeared in this day's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 3 in MPECs 2017-B01 & 2017-B04 -- 2017 AP19, 475665, 138846
B88Bigmuskie Obs. in Italy, 1 in MPEC 2017-B01 -- 2016 PZ66
300Bisei Spaceguard Center in Japan, 1 in MPEC 2017-B04 -- 2017 AP19
160Castelmartini Obs. in Italy, 2 in MPEC 2017-B01 -- 470510, 347813
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 20 in MPECs 2017-B01, 2017-B02 & 2017-B03 -- 2017 AX3, 2017 AW3, 2017 AO19, 2017 AN19, 2017 AJ3, 2016 YN1, 2016 YM, 2016 YJ4, 2016 YE3, 2016 WF9, 2016 VY5, 2016 VC4, 2016 UU80, 2016 UJ101, 2016 TX55, 2016 TA56, 2016 RU, 2016 RF40, 2016 PL1, 2016 NV
J95Great Shefford Obs. in England, 1 in MPEC 2017-B04 -- 2017 AP19
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-B01 -- 96744
V37LCOGT Fort Davis in Texas, 1 in MPEC 2017-B04 -- 2017 AP19
T04LCOGT Haleakala OGG B#2 in Hawaii, 1 in MPEC 2017-B04 -- 2017 AP19
Z21LCOGT Tenerife Aqawan A#1 in the Canary Islands, 1 in MPEC 2017-B04 -- 2017 AP19
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-B04 -- 2017 AP19
118Modra Obs. in Slovakia, 1 in MPEC 2017-B04 -- 2017 AP19
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2017-B02 & 2017-B03 -- 2017 AO19, 2017 AN19
J69North Obs. in England, 1 in MPEC 2017-B01 -- 2017 AJ13
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2017-B01 -- 2017 AO13, 2016 YZ10, 2016 YU10, 2016 QC84
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2017-B01 -- 2016 YN4, 2005 TF, 97725
G40%program code "%" (14) via Canary Islands Obs. in the Canary Islands, 2 in MPEC 2017-B01 -- 2016 YT8, 2016 UU80
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2017-B01 -- 2016 UU80
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2017-B02 & 2017-B03 -- 2017 AO19, 2017 AN19
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-B02 -- 2017 AN19
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPECs 2017-B02 & 2017-B03 -- 2017 AO19, 2017 AN19
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-B03 -- 2017 AO19
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-B01 -- 2016 WQ1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 January '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2324 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.





Notes for Today's Latest Risk Assessments
2016 WQ1NEODyS17362046-211646.23e-08-9.02-9.10NEODyS: "Based on 61 optical observations (of which 1 are rejected as outliers) from 2016-11-20.409 to 2016-12-24.446."
JPL Sentry1645208418.1e-08-8.74-8.740JPL: "Analysis based on 59 observations spanning 34.037 days (2016-Nov-20.40832 to 2016-Dec-24.44531)." Diameter approximately 0.009 km. from mean, weighted H=27.9.

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 16 January '17

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

0000 1/17Grabbed MPEC 2017-B02 - 2017 AN19 - see above
Grabbed MPEC 2017-B03 - 2017 AO19 - see above
Grabbed MPEC 2017-B04 - 2017 AP19 - see above
1940Generated Traffic Report
1736Noted that NEODyS has updated its 2016 WQ1 risk assessment - see above
1645Noted that JPL Sentry has updated its 2016 WQ1 risk assessment - see above
Grabbed MPEC 2017-B01 - Daily Orbit Update - see above