Contents  on 22 June '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 22 June '17

Two objects reported inside ten LD

Today two Solar-System small bodies are reported traveling within ten lunar distances (LD) of our home world. 2017 MF is outbound from 3.12 to 4.49 LD and radar target 441987 2010 NY65 enters our ten-LD reporting "bubble," flying in from 10.22 to 8.69 LD. Next known to be coming around the Sun, NHATS target 2017 BS5 enters the bubble on July 16th.

This report was generated at 1844 UTC with follow-up in today's DOU MPEC for departed radar targets 2017 CS and 418094 2007 WV4 plus astrometry from March for 2017 FP128. Radar observation was posted late yesterday from May-June for 2017 CS and the day before from March for NHATS target 2017 FZ2, which until this had been risk listed.

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 22 June '17

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, fourteen were "one nighters."

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 22 June '17

Minor Planet Electronic Circulars

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

<< DOU on 22 June '17 >>  MPEC 2017-M41 - "12:00 UT" - Daily Orbit Update

MPEC 2017-M40 - "10:35 UT" - Comet P/2004 T1 = 2017 M2 (Linear-Neat)

Observers  on 22 June '17

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPEC 2017-M41 -- 2017 HY50, 2017 GS5, 2017 FQ128, 2017 FL90, 2017 FH90, 2017 FH101, 2017 FD65, 2017 DD38, 2017 CS, 2016 BO1, 2013 LE16, 66391, 190166, 163696, 154144, 11398, 7888, 5879, 2102, 1980, 1917
T08ATLAS Mauna Loa in Hawaii, 6 in MPEC 2017-M41 -- 66391, 494706, 418094, 329774, 222073, 11398
300Bisei Spaceguard Center in Japan, 1 in MPEC 2017-M41 -- 2017 FP128
160Castelmartini Obs. in Italy, 16 in MPEC 2017-M41 -- 2011 ED78, 2010 VB1, 68950, 68348, 52750, 495331, 232368, 190166, 163696, 142040, 141670, 136818, 100926, 6063, 5660, 2329
107Cavezzo Obs. in Italy, 3 in MPEC 2017-M41 -- 2011 ED78, 66391, 494706
822Cordoba Obs. in Argentina, 2 in MPEC 2017-M41 -- 2008 NU, 415746
Z39Costa Teguise Obs. in the Canary Islands, 1 in MPEC 2017-M41 -- 6063
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2017-M40 & 2017-M41 -- P/2017 M2, 2016 AA9, 2015 YR1
006Fabra Obs. in Spain, 1 in MPEC 2017-M41 -- 2102
A17Guidestar Obs. in Germany, 2 in MPEC 2017-M41 -- 2017 LW, 2017 HN3
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-M41 -- 2017 MC
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-M41 -- 5143
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2017-M41 -- 2017 FU128, 136818, 7336, 5332
628Mulheim-Ruhr Obs. in Germany, 2 in MPEC 2017-M41 -- 68950, 142561
G34Oberfrauendorf Obs. in Germany, 3 in MPEC 2017-M41 -- 2017 CS, 2102, 1980
C23Olmen Obs. in Belgium, 1 in MPEC 2017-M41 -- 190166
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2017-M41 -- 2014 YC15, 2013 PX6, 2010 WL, 2002 QD7, 439854, 438452, 432655, 405212, 189630
L04ROASTERR-1 in Romania, 1 in MPEC 2017-M41 -- 2017 MC
Y00SONEAR in Brazil, 2 in MPEC 2017-M41 -- 21088, 11066
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-M41 -- 2017 BL6
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPEC 2017-M41 -- 2017 LP1, 2013 AU27, 2011 QH21
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-M41 -- 2017 FJ128
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2017-M41 -- 2011 ED78, 418094, 11398
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 June '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.





Notes for Today's Latest Risk Assessments
2017 LUNEODyS1600205611.4e-05-1.69-1.691NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2017-06-08.757 to 2017-06-21.457."
2017 FVNEODyS16002113-211532.35e-08-7.60-7.710NEODyS: "Based on 103 optical observations (of which 0 are rejected as outliers) from 2017-03-17.266 to 2017-04-01.875."

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 22 June '17

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

1844Generated Traffic Report
1600Noted that NEODyS has updated its 2017 FV risk assessment - see above
Noted that NEODyS has updated its 2017 LU risk assessment - see above
1501Grabbed MPEC 2017-M40 - Comet P/2004 T1 = 2017 M2 (Linear-Neat) - see above
Grabbed MPEC 2017-M41 - Daily Orbit Update - see above