Contents  on 4 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 4 July '17

Seven objects reported inside ten LD

Seven asteroids are known to be inside ten lunar distances (LD) of our planet today, none of them closer than four LD.

Earth passage I D ~Size Distance Today  Notes
2.52 LD June 302017 MC1 42 m  8.48 to 10.99 LD exits ten LD
3.44 LD July 22017 NB 37 m  4.62 to 6.35 LD
4.08 LD yesterday2017 MO8 21 m  4.21 to 5.35 LD
4.11 LD June 272017 ND 40 m  9.31 to 10.49 LD exits ten LD
4.99 LD June 302017 MB3 29 m  6.91 to 7.97 LD
5.39 LD yesterday2017 ME4 19 m  5.42 to 5.78 LD
6.51 LD July 22017 MC3 54 m  7.17 to 8.84 LD
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.
7.62 LD July 112017 MC4 147 m  < 10 LD July 9

This report was generated at 1040 UTC.



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 4 July '17

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2330 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 32 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 4 July '17

Minor Planet Electronic Circulars

As of last check at 2330 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 4 July '17 >>  MPEC 2017-N52 - "11:59 UT" - Daily Orbit Update


MPEC 2017-N51 - "11:06 UT" - 2017 NH

Observers  on 4 July '17

A total of 38 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 12 in MPEC 2017-N52 -- 2016 TF, 2016 SX1, 2016 JX11, 2016 JK12, 2016 JB, 2016 HA, 2016 GY221, 2016 EU28, 2016 AE2, 2015 VY, 2015 JP1, 2015 EU
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-N51 -- 2017 NH
H21Astronomical Research Obs. Westfield in Illinois, 23 in MPECs 2017-N51 & 2017-N52 -- 2017 NH, 2017 ND, 2017 NB, 2017 MZ, 2017 MW2, 2017 MP8, 2017 MN7, 2017 MM7, 2017 MJ, 2017 MG4, 2017 MG3, 2017 MD3, 2017 MD, 2017 MC4, 2017 MC, 2017 MB1, 2017 MB, 2017 MA, 2017 CS, 2012 CL2, 2006 AR2, 66391, 11398
T05ATLAS Haleakala in Hawaii, 5 in MPECs 2017-N51 & 2017-N52 -- 2017 NH, 68950, 68348, 495331, 6063
T08ATLAS Mauna Loa in Hawaii, 2 in MPECs 2017-N51 & 2017-N52 -- 2017 NH, 2017 BM31
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-N51 -- 2017 NH
160Castelmartini Obs. in Italy, 1 in MPEC 2017-N51 -- 2017 NH
107Cavezzo Obs. in Italy, 1 in MPEC 2017-N51 -- 2017 NH
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-N51 -- 2017 NH
K65Cesena Obs. in Italy, 1 in MPEC 2017-N51 -- 2017 NH
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2017-N51 -- 2017 NH
006Fabra Obs. in Spain, 1 in MPEC 2017-N52 -- 190166
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-N51 -- 2017 NH
203GiaGa Obs. in Italy, 1 in MPEC 2017-N51 -- 2017 NH
J95Great Shefford Obs. in England, 4 in MPECs 2017-N51 & 2017-N52 -- 2017 NH, 2017 NB, 2017 MO8, 2017 MB1
U69"M. Suzuki in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-N51 -- 2017 NH
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 5 in MPEC 2017-N52 -- 2017 DB109, 2017 AQ19, 2016 YT8, 2011 KE3, 2010 TH19
K38M57 Obs. in Italy, 1 in MPEC 2017-N51 -- 2017 NH
W92MASTER OAFA Obs., 2 in MPEC 2017-N52 -- 2009 BF, 3122
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPEC 2017-N52 -- 2017 MY4, 2017 MX4, 2014 NW64
0895program code 5 via Nikolaev Obs. in Ukraine, 1 in MPEC 2017-N52 -- 5660
J69North Obs. in England, 1 in MPEC 2017-N51 -- 2017 NH
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-N51 -- 2017 NH
C23Olmen Obs. in Belgium, 2 in MPECs 2017-N51 & 2017-N52 -- 2017 NH, 190166
B49Paus Obs. in Spain, 1 in MPEC 2017-N51 -- 2017 NH
W25RMS Obs., 7 in MPECs 2017-N51 & 2017-N52 -- 2017 NH, 2017 MD3, 2017 MC4, 366733, 142561, 142040, 106589
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2017-N51 -- 2017 NH
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-N51 -- 2017 NH
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2017-N51 -- 2017 NH
C95SATINO-1 in France, 1 in MPEC 2017-N52 -- 2013 MY6
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-N51 -- 2017 NH
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2017-N51 -- 2017 NH
Y00SONEAR in Brazil, 1 in MPEC 2017-N51 -- 2017 NH
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2017-N51 & 2017-N52 -- 2017 NH, 2017 MT8, 2017 KT34, 2017 HV4, 2014 NF63, 152964
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2017-N52 -- 2017 MZ3, 2017 MF1, 2017 MA5, 2009 QL8, 162183
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2017-N51 -- 2017 NH
718Wiggins Obs. in Utah, 1 in MPEC 2017-N51 -- 2017 NH
C51WISE in Earth polar orbit, 2 in MPEC 2017-N52 -- 2017 GQ6, 285263
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 July '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2140 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 MZ3JPL Sentry21402034-2116132.0454203e-06-4.22-4.260JPL: Computed at 08:44 today Pacific time based on 25 observations spanning 11.728 days (2017-Jun-22.50604 to 2017-Jul-04.23441). Diameter approximately 0.120 km. from weighted mean H=22.30.
NEODyS10342034-2116198.35e-07-4.63-4.770NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2017-06-22.507 to 2017-07-03.423."
2017 MB1JPL Sentry21402082-208219.841e-10-5.77-5.770JPL: Computed at 07:54 today Pacific time based on 148 observations spanning 14.726 days (2017-Jun-19.31418 to 2017-Jul-04.04027). Diameter approximately 0.630 km. from weighted mean H=18.65.

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 4 July '17

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

2140Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 MZ3 risk assessment - see above
1337Grabbed MPEC 2017-N52 - Daily Orbit Update - see above
1140Grabbed MPEC 2017-N51 - 2017 NH - see above
1040Generated Traffic Report
1034Noted that NEODyS has updated its 2017 MZ3 risk assessment - see above