Contents  on 5 May '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 5 May '17

Three objects reported inside ten LD

Three minor planets are reported traveling less than ten lunar distances (LD) from our planet today. The nearest of these is 2017 HU49, moving inward from 6.25 to 6.07 LD.

Earth passage I D ~Size Distance Today  Notes
0.26 LD May 22017 JA 6 m  9.57 to 13.13 LD exits ten LD, intruder
3.70 LD May 82017 HX4 18 m  7.65 from 10.08 LD enters ten LD - DOU
5.55 LD May 112017 HU49 18 m  6.07 from 6.25 LD DOU
Approaching
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU

This report was generated at 1850 UTC with follow-up in today's DOU MPEC for three objects active in the traffic table here plus departed objects 2017 HT49 and 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. 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 5 May '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2301 UTC when the database was dated 5 May

NEOCP Activity  on 5 May '17

The MPC's NEO Confirmation Page has 55 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 55 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 56 listings on the NEOCP today.

New MPECs  on 5 May '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 5 May '17 >>  MPEC 2017-J37 - "11:59 UT" - Daily Orbit Update

Observers  on 5 May '17

Sixteen observers appear in today's MPEC.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 11 in MPEC 2017-J37 -- 2017 HZ4, 2017 HY49, 2017 HX49, 2017 HX4, 2017 HU49, 2017 HK2, 2017 HK1, 2017 FS101, 2011 ED78, 483560, 456651
251Arecibo in Puerto Rico, 1 in radar -- 143404
H21Astronomical Research Obs. Westfield in Illinois, 20 in MPEC 2017-J37 -- 2017 HY49, 2017 HX4, 2017 HV3, 2017 HV, 2017 HR3, 2017 HH, 2017 GB8, 2017 FR2, 2017 FQ101, 2017 FE1, 2017 DS35, 2017 DB109, 2017 CS, 2016 XH2, 2016 WO1, 2016 JP, 2010 LL34, 2006 QA58, 317212, 4596
703Catalina Sky Survey (CSS) in Arizona, 17 in MPEC 2017-J37 -- 2017 DT37, 2017 AC5, 2011 ED78, 53319, 483560, 474425, 456651, 391508, 339492, 188174, 163696, 159560, 154144, 138359, 136582, 106589, 1917
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPEC 2017-J37 -- 2017 HU, 2017 HM49, 2017 HJ1, 2017 HF4, 2017 GV6, 2017 GO6, 2017 GL7, 2017 FT2, 2017 FR64, 2017 FP101, 2017 BF29, 2017 BC30
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 143404
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-J37 -- 3554
474Mt. John Obs. in New Zealand, 9 in MPEC 2017-J37 -- 2017 JB, 2017 HY49, 2017 HX4, 2017 HU49, 2017 HN49, 2017 HH, 2017 GW6, 2017 FT2, 2017 FR90
G96Mt. Lemmon Survey (MLS) in Arizona, 14 in MPEC 2017-J37 -- 2017 HW48, 2017 HU49, 2017 HH2, 2017 FJ90, 2017 DS35, 2016 YU10, 2016 WO1, 2010 JH88, 475665, 468909, 434188, 391508, 265032, 137802
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPEC 2017-J37 -- 2017 JB, 2017 HV4, 2017 HP49, 2017 FT2, 2011 KR12, 68063, 288592, 159857, 3908, 1917
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 19 in MPEC 2017-J37 -- 2017 HU49, 2017 GU6, 2017 DS35, 2016 WO1, 2016 JP, 2015 ME54, 2014 JO25, 2011 ED78, 2010 JH88, 1996 VB3, 475665, 456651, 427643, 276468, 222073, 163696, 11398, 7341, 2329
H36Sandlot Obs. in Kansas, 1 in MPEC 2017-J37 -- 2017 HU49
Y00SONEAR in Brazil, 1 in MPEC 2017-J37 -- 1864
691Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2017-J37 -- 2017 HV4, 2017 HP49, 2017 HN49, 2017 HK49, 2017 FP64, 2017 FK128, 2017 CS, 2014 JO25, 2000 AF205
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2017-J37 -- 2017 HZ4, 2017 HX3, 2017 HR49, 2017 HM49, 2017 HJ49, 2017 HD49, 2017 FO2, 2016 UW80, 2014 SR339
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPEC 2017-J37 -- 2017 HZ49, 2017 HT49, 2004 JR
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 May '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 HZ4JPL Sentry16242082-2113234.652209e-05-5.14-5.510JPL: Computed at 08:18 today Pacific time based on 32 observations spanning 8.9174 days (2017-Apr-26.44436 to 2017-May-05.36177). Diameter approximately 0.022 km. from weighted mean H=25.94.
NEODyS16242073-2117434.66e-05-5.13-5.70NEODyS: "Based on 30 optical observations (of which 1 are rejected as outliers) from 2017-04-26.445 to 2017-05-03.187."
2017 HG4NEODyS16242047-2116964.86e-05-5.70-6.130NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2017-04-26.264 to 2017-05-03.363."
2017 HT2NEODyS16242055-210643.94e-08-4.10-4.290NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2017-04-20.308 to 2017-05-02.291."
2017 GG8NEODyS16242066-207851.19e-05-5.48-5.540NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2017-04-01.558 to 2017-04-29.516."
2017 FC1NEODyS1624R E M O V E D-

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 5 May '17

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

2301Noted Radar Astrometry database update - see above
1850Generated Traffic Report
1624Noted that NEODyS has removed 2017 FC1 as an impact risk - see above
Noted that NEODyS has updated its 2017 GG8 risk assessment - see above
Noted that NEODyS has updated its 2017 HG4 risk assessment - see above
Noted that NEODyS has updated its 2017 HT2 risk assessment - see above
Noted that JPL Sentry has updated its 2017 HZ4 risk assessment - see above
Noted that NEODyS has updated its 2017 HZ4 risk assessment - see above
Grabbed MPEC 2017-J37 - Daily Orbit Update - see above