Contents  on 28 July '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 28 July '17

Three objects reported inside ten LD

Today there are three minor planets known to be less than ten lunar distances (LD) from Earth. Newly announced risk-listed 2017 OE7 is the closest, as it moves out from 4.69 to 5.10 LD, while NHATS target 2017 BS5 is outbound from 6.28 to 7.43 LD and risk-listed 2017 OM1 leaves our ten-LD traffic reporting "bubble," traveling from 9.29 to 12.79 LD. Next up, new discovery 2017 NB7 enters the bubble on July 31st.

This report was generated at 1647 UTC with the discoveries of 2017 OE7 (MPEC, DOU) and 2017 NB7 (MPEC), and with follow-up in today's DOU MPEC for distant 1999 XL136 plus astrometry from earlier this month for departed radar target 2017 CS and from April for NHATS target 2017 FR63.



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 presently so close. 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 28 July '17

Radar observation of one object

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


Data update noted at 2358 UTC when the database was dated 28 July

NEOCP Activity  on 28 July '17

The MPC's NEO Confirmation Page has 92 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 92 objects listed. Of these, 59 were "one nighters." So far The Tracking News has counted a total of 103 listings on the NEOCP today.

New MPECs  on 28 July '17

Minor Planet Electronic Circulars

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


MPEC 2017-O63 - "17:11 UT" - 2017 OL7


<< DOU on 28 July '17 >>  MPEC 2017-O62 - "11:59 UT" - Daily Orbit Update


MPEC 2017-O61 - "02:28 UT" - 2017 OH7


MPEC 2017-O60 - "02:25 UT" - 2017 OF7


MPEC 2017-O59 - "02:13 UT" - 2017 OE7


MPEC 2017-O58 - "02:10 UT" - 2017 NB7


MPEC 2017-O57 - "01:59 UT" - 2017 OJ7


MPEC 2017-O56 - "01:50 UT" - 2017 OG7

Observers  on 28 July '17

A total of 42 observers appear in today's MPECs.

CodeObserver / observatory
J57Alto Turia Obs. in Spain, 2 in MPECs 2017-O60 & 2017-O61 -- 2017 OH7, 2017 OF7
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-O61 -- 2017 OH7
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2017-O60, 2017-O62 & 2017-O63 -- 2017 OL7, 2017 OF7, 2017 OF1, 2017 OD, 2017 NS6, 2017 NS5, 2017 NO6, 2017 NM6, 2017 NK, 2017 MO7, 2017 MN7, 2017 MD4, 2017 FD65, 2017 BM31, 2013 JY35, 477519, 368790, 12538, 2329
T05ATLAS Haleakala in Hawaii, 19 in MPECs 2017-O58, 2017-O59 & 2017-O62 -- 2017 OE7, 2017 NB7, 2015 FO124, 2011 ED78, 496018, 495331, 422699, 265962, 163696, 159467, 138846, 13651, 11398, 6063, 6053, 5332, 3288, 1980, 1917
T08ATLAS Mauna Loa in Hawaii, 2 in MPECs 2017-O59 & 2017-O61 -- 2017 OH7, 2017 OE7
160Castelmartini Obs. in Italy, 14 in MPECs 2017-O60, 2017-O61 & 2017-O62 -- 2017 OH7, 2017 OF7, 2017 OE7, 2017 MB1, 2017 CS, 2008 MH1, 416584, 366733, 232368, 20460, 142561, 141056, 106589, 3288
107Cavezzo Obs. in Italy, 1 in MPEC 2017-O61 -- 2017 OH7
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2017-O56 & 2017-O62 -- 2017 OG7, 2017 ME, 2017 KE5, 2017 GM7
K65Cesena Obs. in Italy, 2 in MPECs 2017-O60 & 2017-O61 -- 2017 OH7, 2017 OF7
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-O60 -- 2017 OF7
K88GINOP-KHK in Hungary, 3 in MPECs 2017-O59, 2017-O60 & 2017-O61 -- 2017 OH7, 2017 OF7, 2017 OE7
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 214869
J95Great Shefford Obs. in England, 4 in MPECs 2017-O57, 2017-O59, 2017-O60 & 2017-O61 -- 2017 OJ7, 2017 OH7, 2017 OF7, 2017 OE7
511Haute Provence Obs. in Germany, 1 in MPEC 2017-O61 -- 2017 OH7
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-O59 -- 2017 OE7
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-O56 -- 2017 OG7
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-O56 -- 2017 OG7
Z21LCOGT Tenerife Aqawan A#1 in the Canary Islands, 1 in MPEC 2017-O60 -- 2017 OF7
W92MASTER OAFA Obs., 1 in MPEC 2017-O62 -- 226554
118Modra Obs. in Slovakia, 1 in MPEC 2017-O60 -- 2017 OF7
900Moriyama Obs. in Japan, 1 in MPEC 2017-O61 -- 2017 OH7
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-O58 -- 2017 NB7
Z80Northolt Branch Obs. in England, 2 in MPECs 2017-O61 & 2017-O62 -- 2017 OL1, 2017 OH7
F51Pan-STARRS 1 (PS1) in Hawaii, 18 in MPECs 2017-O56, 2017-O57, 2017-O59, 2017-O60, 2017-O62 & 2017-O63 -- 2017 OL7, 2017 OJ7, 2017 OG7, 2017 OF7, 2017 OE7, 2017 OD1, 2017 MY2, 2017 MV4, 2014 NF63, 1999 XL136, 496013, 456651, 405189, 365449, 333908, 185716, 100756, 5143
B49Paus Obs. in Spain, 1 in MPEC 2017-O61 -- 2017 OH7
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 2 in MPECs 2017-O60 & 2017-O61 -- 2017 OH7, 2017 OF7
W25RMS Obs., 1 in MPEC 2017-O60 -- 2017 OF7
L04ROASTERR-1 in Romania, 1 in MPEC 2017-O61 -- 2017 OH7
B04Saint-Barthelemy Obs. in Italy, 2 in MPECs 2017-O60 & 2017-O61 -- 2017 OH7, 2017 OF7
104San Marcello Pistoiese Obs. in Italy, 5 in MPECs 2017-O57, 2017-O58, 2017-O59, 2017-O60 & 2017-O61 -- 2017 OJ7, 2017 OH7, 2017 OF7, 2017 OE7, 2017 NB7
H36Sandlot Obs. in Kansas, 2 in MPECs 2017-O57 & 2017-O61 -- 2017 OJ7, 2017 OH7
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2017-O60 -- 2017 OF7
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-O60 -- 2017 OF7
033Schwarzschild Obs. in Germany, 2 in MPECs 2017-O61 & 2017-O63 -- 2017 OL7, 2017 OH7
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-O62 -- 481394
Y00SONEAR in Brazil, 4 in MPECs 2017-O61 & 2017-O62 -- 2017 OH7, 232368, 190166, 138925
587Sormano Obs. in Italy, 1 in MPEC 2017-O61 -- 2017 OH7
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2017-O60 -- 2017 OF7
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-O58 -- 2017 NB7
W33Transit Dreams Obs., 1 in MPEC 2017-O62 -- 190166
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-O62 -- 2017 FR63, 2017 EB3
718Wiggins Obs. in Utah, 1 in MPEC 2017-O61 -- 2017 OH7
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 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 OE7JPL Sentry15302114-211414.758e-05-5.48-5.480JPL #2 for the day: Computed at 08:00 today Pacific time based on 36 observations spanning 3.5343 days (2017-Jul-24.48536 to 2017-Jul-28.01968). Diameter approximately 0.018 km. from weighted mean H=26.36.
NEODyS15302090-211431.19e-04-4.98-4.980NEODyS #2 for the day: "Based on 37 optical observations (of which 2 are rejected as outliers) from 2017-07-24.486 to 2017-07-28.020."
2017 OO1NEODyS1400211512.21e-07-6.77-6.770NEODyS: "Based on 85 optical observations (of which 0 are rejected as outliers) from 2017-07-23.361 to 2017-07-26.135."
2017 OM1NEODyS14002084-211771.52e-06-5.10-5.430NEODyS: "Based on 133 optical observations (of which 4 are rejected as outliers) from 2017-07-22.508 to 2017-07-25.100."
2017 MB1NEODyS1530209814.14e-08-4.32-4.320NEODyS: "Based on 422 optical observations (of which 13 are rejected as outliers) from 2017-06-19.315 to 2017-07-25.110."
JPL Sentry15002098-209811.912e-07-3.66-3.660JPL: Computed at 07:57 today Pacific time based on 418 observations spanning 35.795 days (2017-Jun-19.31418 to 2017-Jul-25.109676). Diameter approximately 0.590 km. from weighted mean H=18.80.

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 28 July '17

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

2358Noted Radar Astrometry database update - see above
1731Grabbed MPEC 2017-O63 - 2017 OL7 - see above
1647Generated Traffic Report
1530Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 OE7 risk assessment - see above
Noted that NEODyS has updated its 2017 OE7 risk assessment - see above
1500Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
1400Noted that JPL Sentry has posted 2017 OE7 as an impact risk - see above
Noted that NEODyS has posted 2017 OE7 as an impact risk - see above
Noted that NEODyS has updated its 2017 OM1 risk assessment - see above
Noted that NEODyS has updated its 2017 OO1 risk assessment - see above
Grabbed MPEC 2017-O62 - Daily Orbit Update - see above
0251Grabbed MPEC 2017-O58 - 2017 NB7 - see above
Grabbed MPEC 2017-O59 - 2017 OE7 - see above
Grabbed MPEC 2017-O60 - 2017 OF7 - see above
Grabbed MPEC 2017-O61 - 2017 OH7 - see above
0210Grabbed MPEC 2017-O56 - 2017 OG7 - see above
Grabbed MPEC 2017-O57 - 2017 OJ7 - see above