Contents  on 3 July '17

NOTE:  These A/CC news pages will update only intermittently 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, due to insufficient Internet access to the data needed, there may be 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 3 July '17

Seven objects reported inside ten LD

Seven minor objects are reported inside ten lunar distances (LD) of Earth today. Nearest are new discovery 2017 NB, outbound from 3.54 to 4.62 LD, and newly announced 2017 MO8, which gets its closest to Earth on this passage, coming to 4.08 LD at 1411 UTC.

Earth passage I D ~Size Distance Today  Notes
2.52 LD June 302017 MC1 42 m  6.04 to 8.48 LD
3.44 LD yesterday2017 NB 37 m  3.54 to 4.62 LD NEW - MPEC
4.08 LD today2017 MO8 21 m  4.08 LD NEW, Earth closest at 1411 UTC - MPEC
4.11 LD June 272017 ND 40 m  8.16 to 9.31 LD NEW - MPEC
4.99 LD June 302017 MB3 29 m  6.00 to 6.91 LD DOU
5.39 LD today2017 ME4 19 m  5.39 LD Earth closest at 1440 UTC
6.51 LD yesterday2017 MC3 54 m  6.51 to 7.17 LD DOU
Approaching
3.12 LD July 232017 BS5 51 m  < 10 LD July 16, NHATS target
3.3   LD July 152017 MR8 34 m  < 10 LD July 8, uncertainty +/- 32 mins., NEW - MPEC, DOU
7.62 LD July 112017 MC4 147 m  < 10 LD July 9 - DOU

This report was updated at 1842 UTC with the discoveries of 2017 ND, which appears in the active traffic table above, and already departed 2017 NC (MPEC), which flew past us at 7.96 LD on June 29th. Today's DOU MPEC has follow-up for four objects in the traffic table and for three departed objects: 2017 LD and radar targets 2017 CS and 441987 2010 NY65. Your first A/CC traffic report today was generated at 0500 UTC with the discoveries announced late yesterday of three objects, all in the traffic table: 2017 NB, 2017 MR8, and 2017 MR8.



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 3 July '17

The MPC's NEO Confirmation Page has 18 listings

When last checked at 1900 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of 29 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 3 July '17

Minor Planet Electronic Circulars

As of last check at 1900 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-N50 - "16:03 UT" - Cometary Activity in (457175) 2008 GO98

Note: In the Hilda family. "Further observations of this object are encouraged to clarify the nature of this cometary activity."


MPEC 2017-N49 - "13:52 UT" - 2017 ND


MPEC 2017-N48 - "13:48 UT" - 2017 MC9


<< DOU on 3 July '17 >>  MPEC 2017-N47 - "11:59 UT" - Daily Orbit Update


MPEC 2017-N46 - "10:30 UT" - 2017 NC


MPEC 2017-N45 - "10:28 UT" - 2017 MY8


MPEC 2017-N44 - "10:24 UT" - 2017 MX8

Observers  on 3 July '17

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2017-N47 -- 2017 MY4, 2017 LC, 2017 FU158, 2015 ME54, 2012 CL2, 2010 WL, 190166, 163696, 11398
T08ATLAS Mauna Loa in Hawaii, 17 in MPECs 2017-N47 & 2017-N49 -- 2017 ND, 2017 CS, 2007 MT20, 54789, 484517, 441987, 416584, 366733, 294739, 232368, 190166, 142040, 12538, 11398, 100926, 2329, 1917
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-N49 -- 2017 ND
703Catalina Sky Survey in Arizona, 1 in MPEC 2017-N49 -- 2017 ND
309&Marco Micheli via Cerro Paranal in Chile, 1 in MPEC 2017-N47 -- 2017 LD
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 19 in MPECs 2017-N44, 2017-N45, 2017-N47 & 2017-N48 -- 2017 MY8, 2017 MY2, 2017 MX8, 2017 MX2, 2017 MW4, 2017 MW2, 2017 MP7, 2017 MM8, 2017 ML8, 2017 MJ8, 2017 MJ7, 2017 MF4, 2017 MD7, 2017 MC9, 2017 MC4, 2017 KE35, 2017 JU1, 2017 GO7, 2017 FQ64
J19El Maestrat Obs. in Spain, 1 in MPEC 2017-N47 -- 11398
J95Great Shefford Obs. in England, 1 in MPEC 2017-N49 -- 2017 ND
568_Marco Micheli on Mauna Kea in Hawaii, 2 in MPEC 2017-N47 -- 2017 MZ8, 2017 MA9
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-N44 -- 2017 MX8
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2017-N45, 2017-N46, 2017-N47 & 2017-N50 -- 2017 NC, 2017 MY8, 2017 MO7, 2017 MC5, 2017 MB5, 2017 MA5, 457175, 401954, 152964
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2017-N44, 2017-N47 & 2017-N48 -- 2017 MZ8, 2017 MX8, 2017 ML7, 2017 MC9, 2017 MB9, 2017 MA9
W25RMS Obs., 13 in MPECs 2017-N46, 2017-N47 & 2017-N49 -- 2017 ND, 2017 NC, 2017 MJ, 2017 MG4, 2017 MC3, 2017 MB5, 2017 MB3, 2017 MB1, 366733, 294739, 142561, 142040, 106589
H36Sandlot Obs. in Kansas, 2 in MPECs 2017-N45 & 2017-N49 -- 2017 ND, 2017 MY8
K14Sencelles Obs. in Spain, 1 in MPEC 2017-N47 -- 2017 MB1
W881Tony Evans in Portugal via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-N47 -- 2017 MB1
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-N47 -- 2017 MC4
Y00SONEAR in Brazil, 2 in MPECs 2017-N47 & 2017-N49 -- 2017 ND, 190166
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2017-N47 -- 2017 MY3, 2017 MW4, 2017 MW2, 2017 MV2, 2017 MR8, 2017 MB1, 2017 LU, 2017 HV4, 2017 FR2, 2015 FO124, 2002 GP186
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2017-N47 & 2017-N48 -- 2017 MZ3, 2017 MC9, 2017 FR2, 2004 AH, 437841
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPECs 2017-N45, 2017-N46, 2017-N49 & 2017-N50 -- 2017 ND, 2017 NC, 2017 MY8, 457175
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 2 in MPECs 2017-N44 & 2017-N47 -- 2017 MX8, 2017 MB9
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 July '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 1900 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 MB9JPL Sentry16302025-2108403.44118e-08-6.33-6.700JPL: Computed at 09:04 today Pacific time based on 6 observations spanning 1.0606 days (2017-Jun-25.44743 to 2017-Jun-26.508041). Diameter approximately 0.078 km. from weighted mean H=23.19.
2017 MA9JPL Sentry16042042-2104124.4302e-09-6.49-7.040JPL: Computed at 08:37 today Pacific time based on 6 observations spanning 1.0532 days (2017-Jun-23.55226 to 2017-Jun-24.605424). Diameter approximately 0.170 km. from weighted mean H=21.48.
2017 MZ8JPL Sentry16042020-2115573.3962e-08-5.68-5.950JPL: Computed at 08:46 today Pacific time based on 7 observations spanning 1.0629 days (2017-Jun-22.55376 to 2017-Jun-23.616624). Diameter approximately 0.111 km. from weighted mean H=22.39.
2017 MZ3JPL Sentry16042034-2103133.8076103e-06-3.94-3.990JPL: Computed at 08:44 today Pacific time based on 22 observations spanning 10.916 days (2017-Jun-22.50604 to 2017-Jul-03.42245). Diameter approximately 0.120 km. from weighted mean H=22.27.
2017 MY3JPL Sentry1504R E M O V E DJPL: Risk listing removed at 1447 UTC today.
2017 MB1NEODyS1604R E M O V E D-
JPL Sentry15042082-211738.556e-09-4.93-5.110JPL: Computed at 07:52 today Pacific time based on 138 observations spanning 14.078 days (2017-Jun-19.31418 to 2017-Jul-03.39258). Diameter approximately 0.628 km. from weighted mean H=18.66.
2017 LDJPL Sentry16042053-21172910.0019789631751-4.23-4.760JPL: Computed at 08:38 today Pacific time based on 99 observations spanning 45.058 days (2017-May-16.298488 to 2017-Jun-30.356014). Diameter approximately 0.011 km. from weighted mean H=27.54.
NEODyS16042048-21175351.98e-03-4.23-4.80NEODyS: "Based on 99 optical observations (of which 0 are rejected as outliers) from 2017-05-16.299 to 2017-06-30.357."

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 3 July '17

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

1842Updated Traffic Report
1630Noted that JPL Sentry has posted 2017 MB9 as an impact risk - see above
Grabbed MPEC 2017-N50 - Cometary Activity in (457175) 2008 GO98 - see above
1604Noted that JPL Sentry has updated its 2017 LD risk assessment - see above
Noted that NEODyS has updated its 2017 LD risk assessment - see above
Noted that JPL Sentry has posted 2017 MA9 as an impact risk - see above
Noted that NEODyS has removed 2017 MB1 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 MZ3 risk assessment - see above
Noted that JPL Sentry has posted 2017 MZ8 as an impact risk - see above
1504Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
Noted that JPL Sentry has removed 2017 MY3 as an impact risk - see above
1400Grabbed MPEC 2017-N44 - 2017 MX8 - see above
Grabbed MPEC 2017-N45 - 2017 MY8 - see above
Grabbed MPEC 2017-N46 - 2017 NC - see above
Grabbed MPEC 2017-N47 - Daily Orbit Update - see above
Grabbed MPEC 2017-N48 - 2017 MC9 - see above
Grabbed MPEC 2017-N49 - 2017 ND - see above