Contents  on 31 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 31 July '17

Three objects reported inside ten LD

Three asteroids are reported flying inside ten lunar distances (LD) of our home world today. Risk-listed 2017 OE7 is outbound from 6.39 to 7.17 LD, NHATS target 2017 BS5 exits ten LD, passing from 9.83 to 11.06 LD, and 2017 NB7 slips inside, moving in from 10.97 to 9.96 LD.

This report was generated at 1655 UTC with the discovery of already departed 2017 OL19 (MPEC), which went by us at about 8.8 LD on July 12th, and with follow-up in today's DOU MPEC for 2017 OE7 and departed intruder 2017 OO1 (adding 5.13 days to its 2.77-day observing arc).



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 31 July '17

The MPC's NEO Confirmation Page has 78 listings

When last checked at 2329 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 78 objects listed. Of these, 40 were "one nighters." So far The Tracking News has counted a total of 92 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 31 July '17

Minor Planet Electronic Circulars

As of last check at 2329 UTC, there have been eleven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-O84 - "16:46 UT" - 2012 FH38


<< DOU on 31 July '17 >>  MPEC 2017-O83 - "11:59 UT" - Daily Orbit Update


MPEC 2017-O82 - "10:50 UT" - 2017 OR19


MPEC 2017-O81 - "10:47 UT" - 2017 OQ19


MPEC 2017-O80 - "10:44 UT" - 2017 OP19


MPEC 2017-O79 - "10:41 UT" - 2017 OO19


MPEC 2017-O78 - "10:38 UT" - 2017 ON19


MPEC 2017-O77 - "10:36 UT" - 2017 OM19


MPEC 2017-O76 - "10:33 UT" - 2017 OL19


MPEC 2017-O75 - "10:30 UT" - 2017 OK19


MPEC 2017-O74 - "10:26 UT" - 2017 OJ19

Observers  on 31 July '17

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2017-O74, 2017-O75, 2017-O76, 2017-O78, 2017-O79, 2017-O80, 2017-O81, 2017-O82 & 2017-O84 -- 2017 OR19, 2017 OQ19, 2017 OP19, 2017 OO19, 2017 ON19, 2017 OL19, 2017 OK19, 2017 OJ19, 2012 FH38
T08ATLAS Mauna Loa in Hawaii, 12 in MPECs 2017-O82 & 2017-O83 -- 2017 OT18, 2017 OR19, 2017 GQ6, 2008 MH1, 54789, 52762, 304640, 143624, 142040, 12538, 100926, 2329
160Castelmartini Obs. in Italy, 7 in MPEC 2017-O83 -- 2017 OG1, 2008 MH1, 495331, 142561, 138925, 11398, 1980
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2017-O74 & 2017-O77 -- 2017 OM19, 2017 OJ19
J27El Guijo Obs. in Spain, 4 in MPEC 2017-O83 -- 2014 SR339, 496018, 190166, 142561
006Fabra Obs. in Spain, 1 in MPEC 2017-O83 -- 138925
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-O75 -- 2017 OK19
157Frasso Sabino Obs. in Italy, 1 in MPEC 2017-O83 -- 2017 OH7
D08Ghezz Obs. in Switzerland, 1 in MPEC 2017-O83 -- 367525
K88GINOP-KHK in Hungary, 2 in MPECs 2017-O75 & 2017-O82 -- 2017 OR19, 2017 OK19
I89'Steven M. Tilley in Louisiana via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2017-O82 -- 2017 OR19
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-O82 -- 2017 OR19
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-O77 -- 2017 OM19
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2017-O79 -- 2017 OO19
W92MASTER OAFA Obs., 1 in MPEC 2017-O83 -- 6053
568_Marco Micheli on Mauna Kea in Hawaii, 7 in MPECs 2017-O74, 2017-O75, 2017-O76, 2017-O77, 2017-O78, 2017-O80 & 2017-O81 -- 2017 OQ19, 2017 OP19, 2017 ON19, 2017 OM19, 2017 OL19, 2017 OK19, 2017 OJ19
F51Pan-STARRS 1 (PS1) in Hawaii, 27 in MPECs 2017-O74, 2017-O75, 2017-O76, 2017-O77, 2017-O78, 2017-O79, 2017-O80, 2017-O81, 2017-O83 & 2017-O84 -- 2017 OQ19, 2017 OP19, 2017 OO19, 2017 ON19, 2017 OM19, 2017 OL19, 2017 OK19, 2017 OJ19, 2017 HW48, 2015 RT83, 2014 QL433, 2014 NF63, 2014 NE64, 2012 FH38, 2011 WV134, 2008 AX28, 2007 TG15, 496124, 426082, 419472, 306367, 20826, 190208, 163454, 162998, 152964, 5786
W25RMS Obs., 11 in MPECs 2017-O82 & 2017-O83 -- 2017 OR19, 2017 OG1, 2017 OE7, 2017 NV5, 2017 NL6, 2017 KR34, 2017 HW48, 481394, 304640, 294739, 142561
H36Sandlot Obs. in Kansas, 3 in MPECs 2017-O80, 2017-O82 & 2017-O83 -- 2017 OR19, 2017 OP19, 2017 KR34
033Schwarzschild Obs. in Germany, 3 in MPECs 2017-O75, 2017-O81 & 2017-O82 -- 2017 OR19, 2017 OQ19, 2017 OK19
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2017-O78, 2017-O80, 2017-O81 & 2017-O83 -- 2017 OQ19, 2017 OP19, 2017 OO1, 2017 ON19
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-O83 -- 138925
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2017-O83 -- 2017 BZ6
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2017-O83 -- 2017 OH7, 2329
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 July '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2329 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 OP19NEODyS15312068-209929.77e-09-5.29-5.290NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2017-07-27.330 to 2017-07-31.224."
JPL Sentry14352068-208727.927e-09-5.45-5.660JPL: Computed at 06:45 today Pacific time based on 18 observations spanning 3.8945 days (2017-Jul-27.32904 to 2017-Jul-31.22353). Diameter approximately 0.420 km. from weighted mean H=19.52.
2017 OE7JPL Sentry15312114-211414.729e-05-5.43-5.430JPL: Computed at 07:57 today Pacific time based on 42 observations spanning 5.1126 days (2017-Jul-24.48536 to 2017-Jul-29.59797). Diameter approximately 0.019 km. from weighted mean H=26.26.
NEODyS1435211415.07e-05-5.33-5.330NEODyS: "Based on 43 optical observations (of which 2 are rejected as outliers) from 2017-07-24.486 to 2017-07-29.599."
2017 OO1JPL Sentry15312115-211511.007e-06-6.11-6.110JPL: Computed at 08:03 today Pacific time based on 88 observations spanning 7.9072 days (2017-Jul-23.36054 to 2017-Jul-31.2677). Diameter approximately 0.043 km. from weighted mean H=24.50.
NEODyS1435211515.26e-07-6.38-6.380NEODyS: "Based on 88 optical observations (of which 0 are rejected as outliers) from 2017-07-23.361 to 2017-07-31.269."
2017 FB1JPL Sentry17302098-210634.1073e-07-5.55-5.810JPL: Computed at 09:52 today Pacific time based on 48 observations spanning 36.957 days (2017-Mar-18.20739 to 2017-Apr-24.163996). Diameter approximately 0.071 km. from weighted mean H=23.39.

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 31 July '17

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

1730Noted that JPL Sentry has updated its 2017 FB1 risk assessment - see above
Grabbed MPEC 2017-O84 - 2012 FH38 - see above
1655Generated Traffic Report
1531Noted that JPL Sentry has updated its 2017 OE7 risk assessment - see above
Noted that JPL Sentry has updated its 2017 OO1 risk assessment - see above
Noted that NEODyS has posted 2017 OP19 as an impact risk - see above
1435Noted that NEODyS has updated its 2017 OE7 risk assessment - see above
Noted that NEODyS has updated its 2017 OO1 risk assessment - see above
Noted that JPL Sentry has posted 2017 OP19 as an impact risk - see above
Grabbed MPEC 2017-O74 - 2017 OJ19 - see above
Grabbed MPEC 2017-O75 - 2017 OK19 - see above
Grabbed MPEC 2017-O76 - 2017 OL19 - see above
Grabbed MPEC 2017-O77 - 2017 OM19 - see above
Grabbed MPEC 2017-O78 - 2017 ON19 - see above
Grabbed MPEC 2017-O79 - 2017 OO19 - see above
Grabbed MPEC 2017-O80 - 2017 OP19 - see above
Grabbed MPEC 2017-O81 - 2017 OQ19 - see above
Grabbed MPEC 2017-O82 - 2017 OR19 - see above
Grabbed MPEC 2017-O83 - Daily Orbit Update - see above