Contents  on 14 September '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 14 September '19

Six objects reported inside ten LD

Six minor planets are reported within ten lunar distances (LD) of our home world, none closer than seven 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
1.45 LD Sept. 9 2019 RT3 32 m  8.31 to 9.98 LD Sept. 3 - 15 risk - DOU
2.50 LD Sept. 10 2019 QY4 10 m  7.32 to 8.98 LD Sept. 4 - 15 NHATS target
4.52 LD Sept. 7 2019 RA 28 m  9.70 to 10.84 LD Aug. 31 - today NHATS target, exits ten LD
7.19 LD Sept. 12 2019 RX2 7 m  7.53 to 7.96 LD Sept. 6 - 17
8.4   LD Sept. 20* 2019 RP2 6 m  8.7 from 8.8 LD Sept. 7 - Oct. 4 *Earth passage uncertainty +/- 41 mins.
9.33 LD today 2019 RQ2 28 m  9.33 LD yesterday - tomorrow Earth closest at 1711 UTC, risk - DOU
Approaching Traffic - sorted by 10-LD bubble entry date
7.89 LD Sept. 21 2017 SL16 23 m  11.80 from 12.90 LD Sept. 16 - 25 NHATS target
4.22 LD Sept. 26 2017 KP27 23 m  13.16 from 14.18 LD Sept. 18 - Oct. 5 NHATS target

This report was generated at 1840 UTC with follow-up in today's DOU MPEC for passing 2019 RQ2 and outbound 2019 RT3, both risk-listed, plus, from September a year ago, the first additional observations of risk-listed intruder 2018 SD2, adding 15.25 days to its 1.92-day discovery arc.

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. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 14 September '19

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2351 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 35 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 14 September '19

Minor Planet Electronic Circulars

As of last check at 2351 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2019-R117 - "20:59 UT" - 2014 QF33

<< DOU on 14 September '19 >>  MPEC 2019-R116 - "12:10 UT" - Daily Orbit Update

MPEC 2019-R115 - "10:29 UT" - 2019 RV3

MPEC 2019-R114 - "10:25 UT" - 2019 RU3

Observers  on 14 September '19

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2019-R114 -- 2019 RU3
160Castelmartini Obs. in Italy, 8 in MPEC 2019-R116 -- 2019 PE2, 2013 CK89, 523605, 492143, 424089, 26166, 163760, 2059
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2019-R116 -- 2018 SD2
K87Dettelbach Vineyard Obs. in Germany, 13 in MPEC 2019-R116 -- 2019 RC, 2019 PE2, 2019 GT3, 2015 RZ35, 2010 VW75, 90403, 503960, 455432, 326777, 237805, 105140, 2100, 1865
595Farra d'Isonzo Obs. in Italy, 2 in MPEC 2019-R116 -- 2019 QC1, 2019 OV2
J95Great Shefford Obs. in England, 3 in MPECs 2019-R114 & 2019-R116 -- 2019 RU3, 2019 RQ2, 2019 RC
238Grorudalen Obs. in Norway, 1 in MPEC 2019-R116 -- 237805
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2019-R115 -- 2019 RV3
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2019-R114 -- 2019 RU3
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2019-R115 -- 2019 RV3
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2019-R116 -- 2008 SR1
H36Sandlot Obs. in Kansas, 1 in MPEC 2019-R114 -- 2019 RU3
C95SATINO-1 in France, 1 in MPEC 2019-R116 -- 2015 PC228
G40-program code "-" (22) via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-R116 -- 2019 RT3
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2019-R114 -- 2019 RU3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-R116 -- 2018 VQ9
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2019-R117 -- 2014 QF33
L01Visnjan Obs., 2 in MPECs 2019-R114 & 2019-R115 -- 2019 RV3, 2019 RU3
C51WISE in Earth polar orbit, 1 in MPEC 2019-R116 -- 326777
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2351 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 RV3JPL Sentry16302029-2118664.036553e-07-3.87-4.930JPL: Computed at 04:32 today Pacific time based on 14 observations spanning 4.5187 days (2019-Sep-06.6042 to 2019-Sep-11.122873). Diameter approximately 0.391 km. from weighted mean H=19.69.
2019 RT3JPL Sentry16302075-2115196.90362506e-05-4.41-4.490JPL: Computed at 06:33 today Pacific time based on 67 observations spanning 1.4693 days (2019-Sep-11.603747 to 2019-Sep-13.07309). Diameter approximately 0.032 km. from weighted mean H=25.10.
2019 RQ2JPL Sentry16302080-210521.665e-07-7.09-7.360JPL: Computed at 06:29 today Pacific time based on 32 observations spanning 8.7115 days (2019-Sep-05.33361 to 2019-Sep-14.045088). Diameter approximately 0.028 km. from weighted mean H=25.42.
2018 SD2JPL Sentry16302065-2115337.140811e-05-6.15-6.620JPL: Computed at 06:45 today Pacific time based on 18 observations spanning 17.172 days (2018-Sep-06.32681 to 2018-Sep-23.49918). Diameter approximately 0.007 km. from weighted mean H=28.41.
2014 QF33JPL Sentry2232R E M O V E DJPL: Risk listing removed at 2219 UTC today
2008 EM68JPL Sentry16302020-211610911.08449782e-05-5.58-6.250JPL: Computed at 00:27 April 7th of 2017 Pacific time based on 12 observations spanning .11019 days (2008-Mar-08.25164 to 2008-Mar-08.36183). Diameter approximately 0.010 km. from weighted mean H=27.72.

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 14 September '19

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

2232Noted that JPL Sentry has removed 2014 QF33 as an impact risk - see above
2105Grabbed MPEC 2019-R117 - 2014 QF33 - see above
1840Generated Traffic Report
1630Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that JPL Sentry has updated its 2018 SD2 risk assessment - see above
Noted that JPL Sentry has updated its 2019 RQ2 risk assessment - see above
Noted that JPL Sentry has updated its 2019 RT3 risk assessment - see above
Noted that JPL Sentry has posted 2019 RV3 as an impact risk - see above
Grabbed MPEC 2019-R114 - 2019 RU3 - see above
Grabbed MPEC 2019-R115 - 2019 RV3 - see above
Grabbed MPEC 2019-R116 - Daily Orbit Update - see above