Contents  on 12 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 12 September '19

Five objects reported inside ten LD

There are five small celestial objects reported to be less than ten lunar distances (LD) from Earth today. Nearest is 2019 QY4, which travels away from 4.22 to 5.71 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
2.50 LD Sept. 10 2019 QY4 10 m  4.22 to 5.71 LD Sept. 4 - 15 NHATS target - DOU
4.52 LD Sept. 7 2019 RA 28 m  7.54 to 8.60 LD Aug. 31 - Sept. 14 NHATS target - DOU
6.95 LD Sept. 10 2019 RH 22 m  9.31 to 12.15 LD Sept. 8 - 12 exits ten LD - DOU
7.19 LD today 2019 RX2 7 m  7.19 LD Sept. 6 - 17 Earth closest at 0318 UTC
8.4   LD Sept. 20* 2019 RP2 6 m  9.0 from 9.1 LD Sept. 7 - Oct. 4 *Earth passage uncertainty
+/- 41 mins.
Approaching Traffic - sorted by 10-LD bubble entry date
9.33 LD Sept. 14 2019 RQ2 28 m  11.44 from 14.04 LD tomorrow - Sept. 15 risk - DOU
7.89 LD Sept. 21 2017 SL16 23 m  14.06 from 15.27 LD Sept. 16 - 25 NHATS target
4.22 LD Sept. 26 2017 KP27 23 m  15.21 from 16.25 LD Sept. 18 - Oct. 5 NHATS target

This report was generated at 1820 UTC with follow-up in today's DOU MPEC for approaching risk-listed 2019 RQ2, outbound objects 2019 RH, 2019 RA, and 2019 QY4, and departed 2019 QZ3.

News item:  MPEC 2019-R106 yesterday announced the almost certain second-ever discovery of an interstellar object, this one a comet: C/2019 Q4 (Borisov), initially known as gb00234. The possibility was first broached on the Comets Mailing List here and has been thoroughly discussed on the Minor Planets Mailing List in threads here and here. Sky & Telescope has a report, and also see an article at National Geographic. Early calculations are that it is large and will not come anywhere near Earth.



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 12 September '19

The MPC's NEO Confirmation Page has 35 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 35 objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 55 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 12 September '19

Minor Planet Electronic Circulars

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


MPEC 2019-R110 - "16:12 UT" - 2019 QQ8


MPEC 2019-R109 - "12:54 UT" - 2019 RR3


<< DOU on 12 September '19 >>  MPEC 2019-R108 - "12:09 UT" - Daily Orbit Update


MPEC 2019-R107 - "07:35 UT" - 2019 RL3

Observers  on 12 September '19

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2019-R108 & 2019-R109 -- 2019 RR3, 2019 RC, 2019 MK2, 2019 GT3, 367525, 237805
703Catalina Sky Survey (CSS) in Arizona, 11 in MPEC 2019-R108 -- 2019 QL4, 2019 PR2, 2019 PE2, 2019 OV2, 2019 NJ5, 2019 NF2, 2019 MK2, 2019 LK5, 2019 LE5, 2019 KC4, 2019 GD3
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2019-R110 -- 2019 QQ8
B92Chinon Obs. in France, 1 in MPEC 2019-R108 -- 237805
E89Geyserland Obs. in New Zealand, 5 in MPEC 2019-R108 -- 89355, 66146, 136993, 9400, 4953
J95Great Shefford Obs. in England, 1 in MPEC 2019-R107 -- 2019 RL3
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 9 in MPECs 2019-R108 & 2019-R109 -- 2019 RR3, 2019 QV4, 2019 OR1, 2019 OQ2, 2019 NC1, 2019 HC, 2018 EB, 2006 KE, 2002 UZ30
568^R. Wainscoat on Mauna Kea in Hawaii, 1 in MPEC 2019-R109 -- 2019 RR3
G96Mt. Lemmon Survey (MLS) in Arizona, 20 in MPECs 2019-R107 & 2019-R108 -- 2019 RV2, 2019 RQ2, 2019 RL3, 2019 QV5, 2019 QL4, 2019 PV2, 2019 PK2, 2019 PH, 2019 OX2, 2019 OV2, 2019 OR4, 2019 OQ4, 2019 NQ3, 2019 NJ6, 2019 NJ5, 2019 NB2, 2019 MW3, 2019 MK2, 2019 KW6, 2019 JE6
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2019-R108 -- 237805
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2019-R107, 2019-R108, 2019-R109 & 2019-R110 -- 2019 RR3, 2019 RL3, 2019 QZ3, 2019 QQ8, 2019 OQ2, 2019 NQ3, 2019 LK5
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2019-R107 -- 2019 RL3
C95SATINO-1 in France, 1 in MPEC 2019-R108 -- 2004 FF29
204Schiaparelli Obs. in Italy, 6 in MPEC 2019-R108 -- 2019 RH, 2019 RC, 2019 RA, 2019 QY4, 2019 QW3, 2019 KC4
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-R108 -- 2002 SQ
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2019-R110 -- 2019 QQ8
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2019-R109 -- 2019 RR3
B18Terskol Obs. in Russia, 1 in MPEC 2019-R108 -- 2019 OT
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-R108 -- 1998 VS
L01Visnjan Obs., 1 in MPEC 2019-R107 -- 2019 RL3
718Wiggins Obs. in Utah, 1 in MPEC 2019-R108 -- 2019 RC
I41Zwicky Transient Facility (ZTF) in southern California, 9 in MPEC 2019-R108 -- 2019 MK2, 2015 YL10, 68950, 492143, 467475, 441825, 367525, 276397, 243025
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 September '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 RQ2JPL Sentry15352056-210521.5294e-07-7.01-7.240JPL: Computed at 06:29 today Pacific time based on 28 observations spanning 3.7253 days (2019-Sep-05.33361 to 2019-Sep-09.05894). Diameter approximately 0.028 km. from weighted mean H=25.39.
NEODyS15352056-210546.21e-07-6.49-6.930NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2019-09-05.334 to 2019-09-09.060."
2008 EM68JPL Sentry15352019-211610951.08589911e-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 12 September '19

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

1820Generated Traffic Report
1810Grabbed MPEC 2019-R110 - 2019 QQ8 - see above
1535Noted that JPL Sentry has updated its 2008 EM68 risk assessment - see above
Noted that JPL Sentry has updated its 2019 RQ2 risk assessment - see above
Noted that NEODyS has updated its 2019 RQ2 risk assessment - see above
Grabbed MPEC 2019-R107 - 2019 RL3 - see above
Grabbed MPEC 2019-R108 - Daily Orbit Update - see above
Grabbed MPEC 2019-R109 - 2019 RR3 - see above