Contents  on 21 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 21 July '17

Two objects reported inside ten LD

Two Solar-System small bodies are reported inside ten lunar distances (LD) of Earth today. NHATS target 2017 BS5 is inbound from 4.79 to 3.90 LD and 2017 MR8 leaves ten LD, moving from 9.77 to 11.25 LD.

This report was generated at 2014 UTC with follow-up in today's DOU MPEC for 2017 BS5 and departed radar targets 2017 CS and 441987 2010 NY65. There also were radar observations from February and March posted late yesterday for four more close-passers: 2017 DV15, 2012 DR32, and NHATS targets 2017 CF32 and 2017 CP1.



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 21 July '17

Radar observation of nine 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 1935 UTC when the database was dated 21 July


Data update noted at 2232 UTC when the database was dated 21 July


Data update noted at 2301 UTC when the database was dated 21 July


Data update noted at 2358 UTC when the database was dated 21 July

NEOCP Activity  on 21 July '17

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 25 listings on the NEOCP today.

New MPECs  on 21 July '17

Minor Planet Electronic Circulars

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


<< DOU on 21 July '17 >>  MPEC 2017-O27 - "11:59 UT" - Daily Orbit Update


MPEC 2017-O26 - "10:37 UT" - 2001 NJ6


MPEC 2017-O25 - "10:36 UT" - 2013 TV135


MPEC 2017-O24 - "01:38 UT" - 2017 OD


MPEC 2017-O23 - "01:35 UT" - 2017 OC

Observers  on 21 July '17

A total of 44 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 2 in MPECs 2017-O23 & 2017-O24 -- 2017 OD, 2017 OC
251Arecibo in Puerto Rico, 9 in radar -- 2016 YC8, 2016 YB8, 2016 VR, 2016 VC1, 2014 QC3, 438955, 357024, 163693, 2102
H21Astronomical Research Obs. Westfield in Illinois, 24 in MPECs 2017-O23, 2017-O24 & 2017-O27 -- 2017 OD, 2017 OC, 2017 NV5, 2017 NM6, 2017 MZ3, 2017 MY2, 2017 MW7, 2017 MV4, 2017 MV2, 2017 MQ8, 2017 MN7, 2017 MM7, 2017 MK8, 2017 MG4, 2017 KR34, 2017 FH90, 2017 FD65, 2017 BM31, 2013 JY35, 2010 XO56, 1998 KF3, 368790, 343166, 276660
T08ATLAS Mauna Loa in Hawaii, 10 in MPECs 2017-O23, 2017-O24, 2017-O26 & 2017-O27 -- 2017 OD, 2017 OC, 2014 QX432, 2001 NJ6, 496005, 495959, 363024, 154589, 136923, 4954
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-O24 -- 2017 OD
160Castelmartini Obs. in Italy, 13 in MPECs 2017-O24 & 2017-O27 -- 2017 OD, 2017 CS, 2017 BM31, 2011 ED78, 68348, 495331, 294739, 190166, 142561, 142040, 136818, 11398, 1980
703Catalina Sky Survey in Arizona, 1 in MPEC 2017-O27 -- 2015 CN62
107Cavezzo Obs. in Italy, 1 in MPEC 2017-O24 -- 2017 OD
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2017-O23, 2017-O24 & 2017-O27 -- 2017 OD, 2017 OC, 2017 BS6
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-O23 -- 2017 OC
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-O26 -- 2001 NJ6
719Etscorn Obs. in New Mexico, 4 in MPEC 2017-O27 -- 190166, 138846, 6063, 1980
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2017-O23 & 2017-O24 -- 2017 OD, 2017 OC
F652Lothar Kurtze in Germany via Faulkes Telescope North in Hawaii, 1 in MPEC 2017-O23 -- 2017 OC
K88GINOP-KHK in Hungary, 2 in MPECs 2017-O23 & 2017-O24 -- 2017 OD, 2017 OC
K73Gravina Obs. in Italy, 1 in MPEC 2017-O27 -- 190166
J95Great Shefford Obs. in England, 1 in MPEC 2017-O24 -- 2017 OD
511Haute Provence Obs. in Germany, 1 in MPEC 2017-O24 -- 2017 OD
I89'Steven M. Tilley in Louisiana via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2017-O27 -- 2017 MB1
P93JAXA Space Tracking & Communications Center (JAXA STCC) in Japan, 3 in MPECs 2017-O23, 2017-O24 & 2017-O27 -- 2017 OD, 2017 OC, 142561
W19Kalamazoo Obs. in Michigan, 2 in MPEC 2017-O27 -- 20460, 138925
585Kiev Comet Station in Ukraine, 2 in MPECs 2017-O23 & 2017-O24 -- 2017 OD, 2017 OC
246KLENOT in the Czech Republic, 2 in MPECs 2017-O23 & 2017-O24 -- 2017 OD, 2017 OC
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-O27 -- 6053
W92MASTER OAFA Obs., 3 in MPEC 2017-O27 -- 152964, 136923, 5751
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-O27 -- 2015 CN62
J69North Obs. in England, 4 in MPECs 2017-O24 & 2017-O27 -- 2017 OD, 2017 NS5, 2017 NM6, 2017 MB1
Z80Northolt Branch Obs. in England, 2 in MPECs 2017-O24 & 2017-O27 -- 2017 OD, 190166
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-O24 -- 2017 OD
C23Olmen Obs. in Belgium, 2 in MPEC 2017-O27 -- 2017 NS5, 190166
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-O27 -- 2015 CN62
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2017-O23 & 2017-O27 -- 2017 OC, 2015 YE21, 2015 TT351, 2015 CN62, 2014 YS50
K63Pascoli Obs. in Italy, 1 in MPEC 2017-O24 -- 2017 OD
Z38Picoto Obs., 1 in MPEC 2017-O27 -- 2017 MB1
D29Purple Mtn. Obs. Xuyi Station in China, 13 in MPEC 2017-O27 -- 2017 MY2, 2015 CN62, 2014 SR339, 2008 AZ110, 495331, 441987, 422699, 405427, 265196, 11398, 7336, 5879, 5332
W25RMS Obs., 13 in MPECs 2017-O23, 2017-O24 & 2017-O27 -- 2017 OD, 2017 OC, 2017 NV5, 2017 MY2, 2017 MT8, 2017 KR34, 481394, 366733, 304640, 294739, 142561, 12538, 106589
L04ROASTERR-1 in Romania, 1 in MPEC 2017-O24 -- 2017 OD
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2017-O23, 2017-O24 & 2017-O27 -- 2017 OD, 2017 OC, 2017 BS5
H36Sandlot Obs. in Kansas, 3 in MPECs 2017-O23, 2017-O24 & 2017-O26 -- 2017 OD, 2017 OC, 2001 NJ6
204Schiaparelli Obs. in Italy, 2 in MPECs 2017-O23 & 2017-O24 -- 2017 OD, 2017 OC
033Schwarzschild Obs. in Germany, 1 in MPEC 2017-O24 -- 2017 OD
Y00SONEAR in Brazil, 5 in MPECs 2017-O23, 2017-O24 & 2017-O27 -- 2017 OD, 2017 OC, 2000 BE19, 154589, 11398
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2017-O27 -- 2015 YE21, 2015 TT351, 2015 CN62
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-O25 -- 2013 TV135
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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 MB1JPL Sentry17232098-209814.503e-08-4.27-4.270JPL: Computed at 07:55 today Pacific time based on 364 observations spanning 31.788 days (2017-Jun-19.31418 to 2017-Jul-21.10194). Diameter approximately 0.600 km. from weighted mean H=18.77.
NEODyS1723209811.33e-10-6.80-6.80NEODyS #2 for the day: "Based on 368 optical observations (of which 7 are rejected as outliers) from 2017-06-19.315 to 2017-07-21.103."
2012 BL14JPL Sentry17232019-21165281.62970543e-05-5.67-6.120JPL: Computed at 18:38 April 7th Pacific time based on 17 observations spanning .11881 days (2012-Jan-21.37429 to 2012-Jan-21.4931). Diameter approximately 0.008 km. from weighted mean H=28.17.

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 21 July '17

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

2358Noted Radar Astrometry database update - see above
2301Noted Radar Astrometry database update - see above
2232Noted Radar Astrometry database update - see above
2014Generated Traffic Report
1935Noted Radar Astrometry database update - see above
1723Noted that JPL Sentry has updated its 2012 BL14 risk assessment - see above
Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
1306Grabbed MPEC 2017-O27 - Daily Orbit Update - see above
1202Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
Grabbed MPEC 2017-O23 - 2017 OC - see above
Grabbed MPEC 2017-O24 - 2017 OD - see above
Grabbed MPEC 2017-O25 - 2013 TV135 - see above
Grabbed MPEC 2017-O26 - 2001 NJ6 - see above