Contents  on 13 July '17

NOTE:  These A/CC news pages will update less often for an extended period. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP efforts, and there may be some gaps in our traffic reporting for Earth's Busy Neighborhood.

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 13 July '17

Three objects reported inside ten LD

Today three transient natural objects are known to be less than ten lunar distances (LD) from Earth. Nearest is newly announced 2017 NT5, inbound from 7.71 to 3.28 LD, while 2017 MR8 moves in from 4.62 to 3.71 LD, and 2017 NK2 is outbound from 4.57 to 5.75 LD. Coming around the Sun next, NHATS target 2017 BS5 arrives inside ten LD on July 16th.

This report was generated at 2330 UTC with the discovery of 2017 NT5 (MPEC) and with follow-up in today's DOU MPEC for departed objects 2017 NB and 2017 MC4, along with pre-discovery observation of NHATS target 2017 FF3 (15.88 days added to its 4.97-day observing arc) and astrometry for risk-listed intruder 2017 HJ from April. Also, we can report radar observations from late last year posted yesterday of NHATS target 2016 VY1 and today of 2016 XK18, 2016 WH, and NHATS targets 2016 XE, 2016 WG7, and 2016 WQ3.



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.

Radar Astrometry  on 13 July '17

Radar observation of eleven objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 1338 UTC when the database was dated 12 July


Data update noted at 2036 UTC when the database was dated 13 July


Data update noted at 2212 UTC when the database was dated 13 July


Data update noted at 2304 UTC when the database was dated 13 July


Data update noted at 2358 UTC when the database was dated 13 July

NEOCP Activity  on 13 July '17

The MPC's NEO Confirmation Page has 11 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of fourteen listings on the NEOCP today.

New MPECs  on 13 July '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.


MPEC 2017-N73 - "19:45 UT" - 2017 NT5


MPEC 2017-N72 - "19:37 UT" - 2017 NS5


MPEC 2017-N71 - "15:31 UT" - Comet 240P/NEAT


<< DOU on 13 July '17 >>  MPEC 2017-N70 - "11:59 UT" - Daily Orbit Update

Observers  on 13 July '17

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 2 in MPECs 2017-N72 & 2017-N73 -- 2017 NT5, 2017 NS5
251Arecibo in Puerto Rico, 11 in radar -- 2016 XK18, 2016 XE, 2016 WQ3, 2016 WH, 2016 WG7, 2016 WB8, 2016 NL15, 96590, 486739, 418849, 326683
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2017-N70 -- 2017 NB, 2017 MB1, 2017 GQ6, 2017 BM31, 2008 MH1, 66391, 366733, 20460, 190166, 142561, 136818, 2329, 1980
T05ATLAS Haleakala in Hawaii, 12 in MPECs 2017-N70 & 2017-N71 -- 495960, 484517, 416584, 232368, 190166, 142561, 142040, 12538, 11398, 100926, 2329, 240P
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2017-N71 -- 240P
107Cavezzo Obs. in Italy, 1 in MPEC 2017-N70 -- 2017 BM31
203GiaGa Obs. in Italy, 3 in MPEC 2017-N70 -- 2017 NH, 2017 BM31, 142040
Q62iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-N72 -- 2017 NS5
Q622Marian Urbanik in Slovakia via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2017-N72 & 2017-N73 -- 2017 NT5, 2017 NS5
Q625Cristovao Jacques in Brazil via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-N73 -- 2017 NT5
Q62[M. Suzuki in Japan via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2017-N72 & 2017-N73 -- 2017 NT5, 2017 NS5
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-N73 -- 2017 NT5
V37LCOGT Fort Davis in Texas, 1 in MPEC 2017-N70 -- 2011 CC22
0895program code 5 via Nikolaev Obs. in Ukraine, 5 in MPEC 2017-N70 -- 2017 NH, 2017 MC4, 2017 MB1, 90075, 5660
C23Olmen Obs. in Belgium, 4 in MPEC 2017-N70 -- 2017 NH, 2017 MB1, 2017 BM31, 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2017-N70, 2017-N72 & 2017-N73 -- 2017 NT5, 2017 NS5, 2017 FF3
W25RMS Obs., 2 in MPEC 2017-N70 -- 2017 MB1, 142561
K14Sencelles Obs. in Spain, 2 in MPEC 2017-N70 -- 2017 MB1, 2017 BM31
Y00SONEAR in Brazil, 4 in MPECs 2017-N70, 2017-N72 & 2017-N73 -- 2017 NT5, 2017 NS5, 495858, 190166
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-N72 -- 2017 NS5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-N70 -- 2017 HJ
C51WISE in Earth polar orbit, 1 in MPEC 2017-N70 -- 215442
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 July '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS 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 NASA/JPL 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 NT5JPL Sentry22122050-211781.4247521e-06-4.82-5.180JPL: Computed at 14:55 today Pacific time based on 61 observations spanning 20.286 days (2017-Jun-23.45994 to 2017-Jul-13.74619). Diameter approximately 0.089 km. from weighted mean H=22.91.
2017 MB1NEODyS1904209818.95e-08-3.92-3.920NEODyS: "Based on 228 optical observations (of which 1 are rejected as outliers) from 2017-06-19.315 to 2017-07-13.078."
JPL Sentry15002098-209816.036e-08-4.09-4.090JPL: Computed at 07:53 today Pacific time based on 227 observations spanning 23.763 days (2017-Jun-19.31418 to 2017-Jul-13.0772). Diameter approximately 0.620 km. from weighted mean H=18.67.
2017 HJNEODyS19042070-2117252.56e-06-6.90-7.480NEODyS: "Based on 63 optical observations (of which 1 are rejected as outliers) from 2017-04-17.426 to 2017-04-24.984."
JPL Sentry15302070-2117203.44992e-06-6.77-7.570JPL: Computed at 08:03 today Pacific time based on 63 observations spanning 7.5571 days (2017-Apr-17.42568 to 2017-Apr-24.982772). Diameter approximately 0.011 km. from weighted mean H=27.46.

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 13 July '17

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

2358Noted Radar Astrometry database update - see above
2330Generated Traffic Report
2304Noted Radar Astrometry database update - see above
2212Noted that JPL Sentry has posted 2017 NT5 as an impact risk - see above
Noted Radar Astrometry database update - see above
2036Grabbed MPEC 2017-N72 - 2017 NS5 - see above
Grabbed MPEC 2017-N73 - 2017 NT5 - see above
Noted Radar Astrometry database update - see above
1904Noted that NEODyS has updated its 2017 HJ risk assessment - see above
Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
Grabbed MPEC 2017-N71 - Comet 240P/NEAT - see above
1530Noted that JPL Sentry has updated its 2017 HJ risk assessment - see above
1500Noted that JPL Sentry has reposted 2017 MB1 as an impact risk - see above
1338Grabbed MPEC 2017-N70 - Daily Orbit Update - see above
Noted Radar Astrometry database update - see above