Contents  on 30 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 30 April '17

Six objects reported inside ten LD

There are six Solar-System small bodies reported within ten lunar distances (LD) of Earth today. Nearest are 2017 HU3, which comes its closest to Earth on this passage -- 6.12 LD at 0226 UTC, and risk-listed intruder 2017 HG4, outbound from 6.40 to 7.21 LD.

Earth passage I D ~Size Distance Today  Notes
0.61 LD April 222017 HG4 10 m  6.40 to 7.21 LD intruder, risk - DOU
3.17 LD April 202017 HU2 23 m  8.82 to 9.65 LD
3.24 LD April 242017 HY 11 m  9.83 to 11.41 LD exits ten LD
3.59 LD April 242017 HB1 19 m  9.64 to 11.14 LD exits ten LD
6.12 LD today2017 HU3 30 m  6.12 LD Earth closest at 0226 UTC - DOU
9.79 LD May 12017 HA5 12 m  9.81 from 9.92 LD NEW - MPEC, DOU
Approaching
3.70 LD May 82017 HX4 18 m  < 10 LD May 5, NEW - MPEC
7.93 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU

This report was generated at 1922 UTC with two discoveries, both active in the traffic table here, and with follow-up in today's DOU MPEC for three objects in the table plus additional observation of one of the new discoveries and follow-up 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. 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 30 April '17

The MPC's NEO Confirmation Page has 49 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 49 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 67 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 30 April '17

Minor Planet Electronic Circulars

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


<< DOU on 30 Apr. '17 >>  MPEC 2017-H88 - "11:59 UT" - Daily Orbit Update


MPEC 2017-H87 - "02:27 UT" - 2017 HA5


MPEC 2017-H86 - "02:24 UT" - 2017 HZ4


MPEC 2017-H85 - "02:20 UT" - 2017 HY4


MPEC 2017-H84 - "02:16 UT" - 2017 HX4


MPEC 2017-H83 - "02:13 UT" - 2017 HW4


MPEC 2017-H82 - "02:10 UT" - 2017 HV4


MPEC 2017-H81 - "02:06 UT" - 2017 HU4


MPEC 2017-H80 - "00:59 UT" - 2015 GG1


MPEC 2017-H79 - "00:57 UT" - 2013 YY13


MPEC 2017-H78 - "00:56 UT" - 2010 VZ71

Observers  on 30 April '17

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-H83 -- 2017 HW4
160Castelmartini Obs. in Italy, 19 in MPEC 2017-H88 -- 2017 GT5, 2017 GB8, 2017 FH101, 2017 FG128, 2017 AC5, 2011 ED78, 53319, 484795, 475665, 456651, 448003, 427643, 188174, 163696, 138359, 137170, 7888, 2329, 1917
703Catalina Sky Survey in Arizona, 1 in MPEC 2017-H83 -- 2017 HW4
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2017-H81, 2017-H82, 2017-H83, 2017-H84, 2017-H85, 2017-H86 & 2017-H88 -- 2017 HZ4, 2017 HY4, 2017 HX4, 2017 HW4, 2017 HV4, 2017 HU4, 2017 FS101
G58Chabot Obs. in northern California, 3 in MPEC 2017-H88 -- 2017 HP3, 2017 HN3, 2017 HA1
958Dax Obs. in France, 2 in MPECs 2017-H83 & 2017-H85 -- 2017 HY4, 2017 HW4
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2017-H78, 2017-H79 & 2017-H80 -- 2015 GG1, 2013 YY13, 2010 VZ71
151Eschenberg Obs. in Switzerland, 2 in MPEC 2017-H88 -- 2014 JO25, 2000 AF205
E10*program code "*" (19) via Faulkes Telescope South in New South Wales, 1 in MPEC 2017-H88 -- 2017 DV37
D08Ghezz Obs. in Switzerland, 1 in MPEC 2017-H88 -- 159560
J95Great Shefford Obs. in England, 1 in MPEC 2017-H85 -- 2017 HY4
A17Guidestar Obs. in Germany, 3 in MPEC 2017-H88 -- 2017 HK1, 2017 GU6, 2016 WO1
Q62`Steven M. Tilley in Louisiana via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-H88 -- 2017 HT3
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2017-H84 -- 2017 HX4
130Lumezzane Obs. in Italy, 10 in MPEC 2017-H88 -- 2016 WO1, 2016 HJ19, 2010 JH88, 483560, 474425, 427643, 339492, 260141, 154144, 136582
K38M57 Obs. in Italy, 2 in MPEC 2017-H88 -- 2017 GU6, 2017 CS
W92MASTER OAFA Obs., 1 in MPEC 2017-H88 -- 2014 KF91
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-H88 -- 20460
568_Marco Micheli on Mauna Kea in Hawaii, 5 in MPECs 2017-H81, 2017-H82, 2017-H84, 2017-H86 & 2017-H87 -- 2017 HZ4, 2017 HX4, 2017 HV4, 2017 HU4, 2017 HA5
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2017-H83 & 2017-H88 -- 2017 HW4, 367684, 248083, 190758, 5751
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2017-H88 -- 2017 HP3
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2017-H81, 2017-H82, 2017-H83, 2017-H84, 2017-H85, 2017-H86 & 2017-H87 -- 2017 HZ4, 2017 HY4, 2017 HX4, 2017 HW4, 2017 HV4, 2017 HU4, 2017 HA5
D29Purple Mtn. Obs. Xuyi Station in China, 14 in MPEC 2017-H88 -- 2017 GU6, 2017 GB8, 2017 FE1, 2012 HN13, 475665, 409256, 39796, 190166, 159560, 138359, 138155, 10636, 4055, 1917
W25RMS Obs., 2 in MPECs 2017-H83 & 2017-H85 -- 2017 HY4, 2017 HW4
104San Marcello Pistoiese Obs. in Italy, 5 in MPECs 2017-H83, 2017-H85, 2017-H87 & 2017-H88 -- 2017 HY4, 2017 HW4, 2017 HP3, 2017 HC1, 2017 HA5
204Schiaparelli Obs. in Italy, 3 in MPECs 2017-H83, 2017-H85 & 2017-H87 -- 2017 HY4, 2017 HW4, 2017 HA5
033Schwarzschild Obs. in Germany, 1 in MPEC 2017-H85 -- 2017 HY4
Y28Sertao de Itaparica Obs. (OASI) in Brazil, 3 in MPECs 2017-H78, 2017-H79 & 2017-H80 -- 2015 GG1, 2013 YY13, 2010 VZ71
691Spacewatch 0.9m telescope in Arizona, 19 in MPEC 2017-H88 -- 2017 HU4, 2017 HS, 2017 HN3, 2017 HJ1, 2017 HH, 2017 HA5, 2017 FO2, 2017 FM128, 2017 FE128, 2017 FC157, 2017 DC109, 2016 UW80, 2016 SD, 2014 NA64, 2010 GA7, 2008 SQ7, 2000 AF205, 474231, 370688
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2017-H85 & 2017-H88 -- 2017 HY4, 462550
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2017-H83, 2017-H85 & 2017-H87 -- 2017 HY4, 2017 HW4, 2017 HA5
I52Steward Obs. Mt. Lemmon Station in Arizona, 12 in MPECs 2017-H83, 2017-H85 & 2017-H88 -- 2017 HY4, 2017 HX3, 2017 HW4, 2017 HU3, 2017 HT3, 2017 HQ3, 2017 HP3, 2017 HN3, 2017 HH2, 2017 HE4, 2017 HA1, 2010 VZ71
926Tenagra II Obs. in Arizona, 4 in MPECs 2017-H86 & 2017-H88 -- 2017 HZ4, 2017 HH, 2017 HC1, 2017 HA1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 5 in MPEC 2017-H88 -- 2017 HJ1, 2017 HG4, 2017 HF1, 2017 HA1, 2014 JO25
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 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.
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 HZ4NEODyS19052042-2117454.95e-05-5.09-5.710NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2017-04-26.445 to 2017-04-29.176."
JPL Sentry05072049-2113304.97022221e-05-5.08-5.580JPL: Computed at 21:28 April 29th Pacific time based on 16 observations spanning 2.7313 days (2017-Apr-26.44436 to 2017-Apr-29.17569). Diameter approximately 0.023 km. from weighted mean H=25.88.
2017 HG4JPL Sentry16002048-2115182.537796e-05-6.07-6.720JPL: Computed at 08:36 today Pacific time based on 27 observations spanning 2.9717 days (2017-Apr-26.26272 to 2017-Apr-29.234385). Diameter approximately 0.010 km. from weighted mean H=27.66.
2010 HV20JPL Sentry04142116-211621.3074e-07-5.33-5.380JPL: Computed at 18:44 April 29th Pacific time based on 76 observations spanning 6.9090 days (2010-Apr-25.36474 to 2010-May-02.27369). Diameter approximately 0.140 km. from weighted mean H=21.89.

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 30 April '17

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

1922Generated Traffic Report
1905Noted that NEODyS has posted 2017 HZ4 as an impact risk - see above
1600Noted that JPL Sentry has updated its 2017 HG4 risk assessment - see above
Grabbed MPEC 2017-H88 - Daily Orbit Update - see above
0507Noted that JPL Sentry has posted 2017 HZ4 as an impact risk - see above
0414Noted that JPL Sentry has reposted 2010 HV20 as an impact risk - see above
0245Grabbed MPEC 2017-H86 - 2017 HZ4 - see above
Grabbed MPEC 2017-H87 - 2017 HA5 - see above
0222Grabbed MPEC 2017-H81 - 2017 HU4 - see above
Grabbed MPEC 2017-H82 - 2017 HV4 - see above
Grabbed MPEC 2017-H83 - 2017 HW4 - see above
Grabbed MPEC 2017-H84 - 2017 HX4 - see above
Grabbed MPEC 2017-H85 - 2017 HY4 - see above
0121Grabbed MPEC 2017-H80 - 2015 GG1 - see above
0058Grabbed MPEC 2017-H78 - 2010 VZ71 - see above
Grabbed MPEC 2017-H79 - 2013 YY13 - see above