Contents  on 13 April '19

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 13 April '19

Sixteen objects reported inside ten LD

Based on JPL Horizons data from four days ago, there are sixteen minor objects inside ten lunar distances (LD) of our planet today. This report was generated at 2235 UTC to let you know there will be no traffic report today. See today's DOU MPEC for which objects have new observations from whom. [There was no report due to problems in acquiring data. The previous and next regular traffic reports were posted on April 9th and April 15th.]

Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting about transient natural objects that approach our planet's 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 temporal 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 13 April '19

The MPC's NEO Confirmation Page has 80 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 80 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 119 listings on the NEOCP today.

New MPECs  on 13 April '19

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 13 Apr. '19 >>  MPEC 2019-G154 - "12:06 UT" - Daily Orbit Update

Observers  on 13 April '19

A total of 32 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2019-G154 -- 2019 GC6, 2019 FO, 2019 CD2, 2019 AC, 307918, 230599
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2019-G154 -- 2005 FC3
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2019-G154 -- 2019 FU
B88Bigmuskie Obs. in Italy, 3 in MPEC 2019-G154 -- 230599, 162361, 5189
Z36Cancelada Obs., 1 in MPEC 2019-G154 -- 141525
160Castelmartini Obs. in Italy, 2 in MPEC 2019-G154 -- 325395, 136793
703Catalina Sky Survey in Arizona, 1 in MPEC 2019-G154 -- 2019 GZ6
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2019-G154 -- 2019 FB3
Z43Landehen Obs., 1 in MPEC 2019-G154 -- 2019 GL4
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2019-G154 -- 2019 GC6
L09LCO Sutherland Aqawan A#1 in South Africa, 1 in MPEC 2019-G154 -- 2019 GM4
130Lumezzane Obs. in Italy, 3 in MPEC 2019-G154 -- 394130, 358453, 230599
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2019-G154 -- 2019 GJ4
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2019-G154 -- 152931
W92MASTER OAFA Obs., 1 in MPEC 2019-G154 -- 6455
L52MASTER Tavrida, 1 in MPEC 2019-G154 -- 307918
D54MASTER-II Blagoveshchensk in Russia, 1 in MPEC 2019-G154 -- 137170
474Mt. John Obs. in New Zealand, 15 in MPEC 2019-G154 -- 2019 GU5, 2019 GR2, 2019 GR, 2019 GP3, 2019 GP, 2019 GN, 2019 GL, 2019 GG3, 2019 GG1, 2019 GF1, 2019 GC6, 2019 GB4, 2019 FC3, 2019 FA3, 2017 QP17
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2019-G154 -- 2019 GZ6, 2019 GC6
K74Muensterschwarzach Obs. in Germany, 2 in MPEC 2019-G154 -- 396593, 152931
Z80Northolt Branch Obs. in England, 1 in MPEC 2019-G154 -- 137170
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2019-G154 -- 2019 GZ6, 2019 GC6
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2019-G154 -- 2019 GZ6, 358453
C95SATINO-1 in France, 1 in MPEC 2019-G154 -- 2018 YA3
033Schwarzschild Obs. in Germany, 3 in MPEC 2019-G154 -- 2019 FQ1, 2019 FD1, 2019 FB2
W885M. Kumrucu-Lohmiller in Massachusetts via Chile Obs. in Chile, 1 in MPEC 2019-G154 -- 144898
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-G154 -- 2019 AW11
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2019-G154 -- 2019 GT2, 2019 GC6
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2019-G154 -- 230599
I52Steward Obs. Mt. Lemmon Station in Arizona, 4 in MPEC 2019-G154 -- 2019 GW5, 2019 GV3, 2019 GK4, 2019 GJ4
C51WISE in Earth polar orbit, 5 in MPEC 2019-G154 -- 2010 JL33, 86667, 381677, 180186, 162433
I41Zwicky Transient Facility (ZTF) in southern California, 3 in MPEC 2019-G154 -- 2019 GZ6, 2012 CP2, 394130
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 April '19

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 and NEODyS listings is 100 years, and both post impact solutions beyond that for some 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
2019 GC6NEODyS16412048-2118743.15e-05-5.60-6.060NEODyS: "Based on 56 optical observations (of which 0 are rejected as outliers) from 2019-03-31.335 to 2019-04-13.389."
JPL Sentry16002091-211371.7137338e-06-7.00-7.160JPL: Computed at 08:42 today Pacific time based on 56 observations spanning 13.054 days (2019-Mar-31.33428 to 2019-Apr-13.38843). Diameter approximately 0.016 km. from weighted mean H=26.66.

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 13 April '19

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

2235Generated Traffic Report
1641Noted that NEODyS has updated its 2019 GC6 risk assessment - see above
1600Noted that JPL Sentry has reposted 2019 GC6 as an impact risk - see above
Grabbed MPEC 2019-G154 - Daily Orbit Update - see above