Contents  on 27 April '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 27 April '17

Seven objects reported inside ten LD

Seven asteroids are known to be within ten lunar distances (LD) of our planet today. Nearest of these is 2017 HY3, which is outbound from 3.66 to 6.95 LD.

Earth passage I D ~Size Distance Today  Notes
0.33 LD April 232017 HV2 6 m  6.44 to 8.52 LD intruder
2.55 LD yesterday2017 HY3 30 m  3.66 to 6.95 LD DOU
3.17 LD April 202017 HU2 23 m  6.38 to 7.18 LD
3.24 LD April 242017 HY 11 m  5.38 to 6.78 LD
3.59 LD April 242017 HB1 19 m  5.50 to 6.79 LD
6.12 LD April 302017 HU3 28 m  7.42 from 8.72 LD
9.18 LD today2017 HW2 16 m  9.18 LD Earth closest at 2158 UTC - DOU
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target

This report was generated at 1740 UTC with the recovery of distant 2012 OQ in today's DOU MPEC along with follow-up for two objects active in the traffic table here and for departed radar target 2014 JO25.

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. "Distant" is used here to describe an object that has come within ten LD during the ten-plus years that A/CC has posted these traffic reports but won't come so close during current observing. 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 27 April '17

The MPC's NEO Confirmation Page has 76 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 76 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 82 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 27 April '17

Minor Planet Electronic Circulars

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

<< DOU on 27 Apr. '17 >>  MPEC 2017-H72 - "11:59 UT" - Daily Orbit Update

Observers  on 27 April '17

Fourteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPEC 2017-H72 -- 2017 HH2, 2017 HH, 2017 HF1, 2017 HC1, 2017 HA1, 2017 GW6, 2017 GT5, 2017 GQ6, 2017 GQ4, 2017 GM6, 2017 GK4, 2017 GB8, 2017 FS64, 2017 FS101, 2017 FR2, 2017 FN90, 2017 FM128, 2017 FL91, 2017 FL90, 2017 FL1, 2017 FJ90, 2017 FE1, 2017 EE23, 2017 DS35, 2017 DB109, 469219, 277473, 276049
T05ATLAS Haleakala in Hawaii, 8 in MPEC 2017-H72 -- 2017 GT5, 474231, 474179, 138359, 138155, 4055, 3103, 2329
T08ATLAS Mauna Loa in Hawaii, 5 in MPEC 2017-H72 -- 90075, 484795, 252091, 5604, 1036
703Catalina Sky Survey (CSS) in Arizona, 15 in MPEC 2017-H72 -- 2017 FH101, 2017 AC5, 2010 JH88, 54789, 474425, 40267, 391508, 381906, 260141, 163696, 143624, 136923, 7088, 3352, 2329
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPEC 2017-H72 -- 2017 GQ4, 2017 FX2, 2017 FP102, 2017 FK91, 2017 EC, 2017 BU31, 2016 WW9, 2012 OQ
734Farpoint Obs. in Kansas, 1 in MPEC 2017-H72 -- 2017 HK1
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPEC 2017-H72 -- 2017 HK2, 2017 EW2, 2014 KF91, 2013 JM7, 2013 CL118, 2008 HY37, 484517, 434734, 250614, 161999, 141531, 136923
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-H72 -- 2007 VO243
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-H72 -- 2329
I52Steward Obs. Mt. Lemmon Station in Arizona, 2 in MPEC 2017-H72 -- 2017 HX3, 2017 HS3
926Tenagra II Obs. in Arizona, 2 in MPEC 2017-H72 -- 2017 HY3, 2017 HW2
Z52The Studios Obs., 1 in MPEC 2017-H72 -- 11398
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 3 in MPEC 2017-H72 -- 2017 GM7, 2017 FB1, 2014 JO25
C51WISE in Earth polar orbit, 4 in MPEC 2017-H72 -- 2017 HW1, 474179, 448003, 370702
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 April '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 HY3JPL Sentry15452024-202411.514e-09-7.95-7.950JPL: Computed at 08:04 today Pacific time based on 59 observations spanning 2.1094 days (2017-Apr-24.37009 to 2017-Apr-26.47947). Diameter approximately 0.030 km. from weighted mean H=25.29.
2017 GM7NEODyS1732R E M O V E D-
2017 GM6JPL Sentry15452111-211112.062e-07-7.62-7.620JPL: Computed at 08:05 today Pacific time based on 46 observations spanning 18.887 days (2017-Apr-05.34221 to 2017-Apr-24.228785). Diameter approximately 0.022 km. from weighted mean H=25.93.
2017 FR102NEODyS18002115-211694.78e-07-6.50-7.030NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2017-03-27.557 to 2017-04-24.265."
2017 FB1NEODyS18002092-210658.8e-07-5.23-5.420NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2017-03-18.208 to 2017-04-24.165."
JPL Sentry17322098-210623.898e-07-5.57-5.820JPL #2 for the day: Computed at 09:53 today Pacific time based on 46 observations spanning 36.957 days (2017-Mar-18.20739 to 2017-Apr-24.163996). Diameter approximately 0.071 km. from weighted mean H=23.38.

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 27 April '17

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

1800Noted that NEODyS has updated its 2017 FB1 risk assessment - see above
Noted that NEODyS has updated its 2017 FR102 risk assessment - see above
1740Generated Traffic Report
1732Noted that JPL Sentry has updated its 2017 FB1 risk assessment - see above
Noted that NEODyS has removed 2017 GM7 as an impact risk - see above
1545Noted that JPL Sentry has updated its 2017 FB1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 GM6 risk assessment - see above
Noted that JPL Sentry has updated its 2017 HY3 risk assessment - see above
Grabbed MPEC 2017-H72 - Daily Orbit Update - see above