Contents  on 13 October '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 October '19

Nine objects reported inside ten LD

Nine visitors are reported within ten lunar distances (LD) of Earth today. The nearest of these is 2019 TT1, which comes its closest to our planet on this passage, reaching 2.90 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
1.43 LD Oct. 11 2019 TZ6 10 m  3.46 to 5.95 LD Oct. 8 - 15
2.5   LD Oct. 19* 2019 TK5 11 m  7.3 from 8.5 LD Oct. 11 - 26 EPU +/- 8 mins.*, NHATS target, risk
2.90 LD today 2019 TT1 20 m  2.90 LD Oct. 10 - 16 Earth closest at 1823 UTC
3.67 LD Oct. 6 2019 TF3 9 m  8.27 to 9.29 LD Sept. 28 - tomorrow NHATS target
3.91 LD tomorrow 2019 TA7 19 m  4.52 from 6.07 LD Oct. 11 - 18
4.50 LD Oct. 2 2019 TW 10 m  9.66 to 10.41 LD Sept. 21 - today NHATS target, exits ten LD
6.0   LD today* 2019 TB7 17 m  6.0 LD Oct. 6 - 19 EPU +/- 20 mins.*, NHATS target, Earth
closest at 0121 UTC
8.56 LD yesterday 2019 SV9 28 m  8.56 to 9.18 LD Oct. 11 - 14
9.26 LD today 2019 TH2 18 m  9.26 LD Oct. 11 - 15 Earth closest at 0603 UTC

This report was generated at 1853 UTC with follow-up in today's DOU MPEC for departed risk-listed 2019 RT3 plus observations from September of 2019 SP and risk-listed objects 2019 QE7 and 2019 QE (21.07 days added to 17.17-day observing arc).

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
8.22 LD Oct. 18 2019 TE2 28 m  12.30 from 14.08 LD Oct. 15 - 20
8.2   LD Oct. 18* 2019 TP5 27 m  19.9 from 23.7 LD Oct. 16 - 19 EPU +/- 13 mins.*
*EPU = Earth passage uncertainty



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 October '19

The MPC's NEO Confirmation Page has 46 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 46 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 47 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 13 October '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 October '19 >>  MPEC 2019-T221 - "12:03 UT" - Daily Orbit Update

Observers  on 13 October '19

Ten observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 25 in MPEC 2019-T221 -- 2019 SP, 2019 SO, 2019 SF8, 2019 RY, 2019 RU1, 2019 RT3, 2019 RK, 2019 RB1, 2019 QY3, 2019 QX, 2019 QW3, 2019 QE7, 2019 QC1, 2019 PR2, 2019 PE2, 2019 MW, 2019 MK2, 2019 LE5, 2019 GT3, 2019 FY, 2014 TY33, 2012 KC6, 366746, 163760, 2100
T05ATLAS Haleakala in Hawaii, 2 in MPEC 2019-T221 -- 18172, 162082
T08ATLAS Mauna Loa in Hawaii, 9 in MPEC 2019-T221 -- 395289, 35107, 214088, 5189, 3753, 3102, 2059, 1866, 1620
Z36Cancelada Obs., 1 in MPEC 2019-T221 -- 2017 MN8
160Castelmartini Obs. in Italy, 6 in MPEC 2019-T221 -- 2009 QB36, 2001 QC34, 492143, 4183, 2059, 1620
E89Geyserland Obs. in New Zealand, 3 in MPEC 2019-T221 -- 66146, 136993, 9400
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2019-T221 -- 340666
C95SATINO-1 in France, 1 in MPEC 2019-T221 -- 2019 QR6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-T221 -- 2019 QE
I41Zwicky Transient Facility (ZTF) in southern California, 8 in MPEC 2019-T221 -- 2019 SZ2, 2010 UH7, 2006 MA, 489486, 448818, 442243, 137805, 3691
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 October '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.
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
2019 RT3NEODyS21372075-2118555.5e-05-4.66-5.290NEODyS: "Based on 119 optical observations (of which 0 are rejected as outliers) from 2019-09-11.605 to 2019-10-10.362."
JPL Sentry17002075-2117200.00013054343-4.17-4.260JPL: Computed at 06:33 today Pacific time based on 103 observations spanning 28.758 days (2019-Sep-11.603747 to 2019-Oct-10.36126). Diameter approximately 0.031 km. from weighted mean H=25.16.
2019 QE7NEODyS21372097-2117331.31e-05-5.99-6.190NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2019-08-31.571 to 2019-09-05.376."
JPL Sentry17002097-2117192.732282e-06-6.65-7.210JPL: Computed at 06:32 today Pacific time based on 27 observations spanning 4.8050 days (2019-Aug-31.57014 to 2019-Sep-05.37518). Diameter approximately 0.016 km. from weighted mean H=26.65.
2019 QENEODyS2137R E M O V E D-
JPL Sentry1700R E M O V E DJPL: Risk listing removed at 1330 UTC today

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 October '19

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

2137Noted that NEODyS has removed 2019 QE as an impact risk - see above
Noted that NEODyS has updated its 2019 QE7 risk assessment - see above
Noted that NEODyS has updated its 2019 RT3 risk assessment - see above
1853Generated Traffic Report
1700Noted that JPL Sentry has removed 2019 QE as an impact risk - see above
Noted that JPL Sentry has updated its 2019 QE7 risk assessment - see above
Noted that JPL Sentry has updated its 2019 RT3 risk assessment - see above
Grabbed MPEC 2019-T221 - Daily Orbit Update - see above