Contents  on 9 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 9 September '19

Twelve objects reported inside ten LD

There are twelve asteroidal objects reported to be less than ten lunar distances (LD) from our planet today. Nearest to us is newly announced 2019 RG2, which comes to 1.36 LD, but gets even closer to the Moon, reaching 0.55 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
0.48 LD Sept. 7 2019 RC1 6 m  7.08 to 11.63 LD Sept. 5 - 9 intruder, exits ten LD
1.11 LD Sept. 4 2019 RB2 10 m  6.99 to 8.42 LD Aug. 28 - Sept. 11 NEW - MPEC
1.36 LD today 2019 RG2 11 m  1.36 LD Sept. 7 - 11 NEW, Moon buzzer, Moon closest 0.55 LD at
1611 UTC, Earth closest at 1911 UTC - MPEC
2.50 LD tomorrow 2019 QY4 9 m  2.50 from 3.09 LD Sept. 4 - 15
3.53 LD Sept. 4 2019 RF1 5 m  7.03 to 8.22 LD Aug. 28 - Sept. 11
4.52 LD Sept. 7 2019 RA 28 m  5.03 to 5.71 LD Aug. 31 - Sept. 14
6.11 LD Sept. 6 2019 RD1 14 m  7.70 to 8.76 LD Sept. 1 - 11
6.96 LD tomorrow 2019 RH 22 m  7.09 from 8.65 LD yesterday - Sept. 12
8.1   LD Sept. 5* 2019 RM1 9 m  9.7 to 10.7 LD Sept. 2 - 9 EPU +/- 6 mins.*, exits ten LD
8.4   LD Sept. 20* 2019 RP2 6 m  9.4 from 9.6 LD Sept. 7 - Oct. 4 NEW, EPU +/- 41 mins.* - MPEC
9.68 LD today 2019 RX1 28 m  9.68 LD yesterday - today Earth closest at 0209 UTC, risk
9.69 LD today 2019 QZ3 38 m  9.69 LD Sept. 7 - 10 Earth closest at 1015 UTC
* EPU = Earth passage uncertainty
Approaching Traffic - sorted by 10-LD bubble entry date
9.34 LD Sept. 14 2019 RQ2 29 m  20.49 from 24.02 LD Sept. 13 - 15 NEW, risk - MPEC
7.89 LD Sept. 21 2017 SL16 23 m  17.77 from 19.06 LD Sept. 16 - 25 NHATS target

This report was generated at 2240 UTC with two new discoveries from late yesterday: passing Moon-buzzer 2019 RG2 (MPEC) and outbound 2019 RB2 (MPEC), and with three more from today: approaching risk-listed 2019 RQ2 (MPEC), inbound 2019 RP2 (MPEC), and already departed 2019 RR2 (MPEC), which slipped past us at 4.93 LD on August 31st. Today's DOU MPEC has follow-up for departed risk-listed objects 2019 QU3 and 2019 RQ (see Bill Gray's comments on this intruder's close Moon passage).



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 9 September '19

The MPC's NEO Confirmation Page has 71 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 71 objects listed. Of these, 29 were "one nighters." So far The Tracking News has counted a total of 82 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 9 September '19

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.


MPEC 2019-R92 - "23:14 UT" - A/2019 Q1


MPEC 2019-R91 - "19:02 UT" - 2019 RV2


MPEC 2019-R90 - "18:57 UT" - 2019 RU2


MPEC 2019-R89 - "18:54 UT" - 2019 RT2


MPEC 2019-R88 - "18:48 UT" - 2019 RS2


MPEC 2019-R87 - "18:33 UT" - 2019 RR2


MPEC 2019-R86 - "18:02 UT" - 2019 RQ2


MPEC 2019-R85 - "17:22 UT" - 2019 RP2


MPEC 2019-R84 - "15:12 UT" - Comet P/2007 T4 = 2019 R2 (Gibbs)


MPEC 2019-R83 - "14:54 UT" - Comet P/2008 Y1 = 2019 R1 (Boattini)


<< DOU on 9 September '19 >>  MPEC 2019-R82 - "12:07 UT" - Daily Orbit Update

Observers  on 9 September '19

A total of 42 observers appear in today's MPECs.

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 1 in MPEC 2019-R83 -- P/2019 R1
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2019-R82, 2019-R86, 2019-R88, 2019-R89, 2019-R90 & 2019-R91 -- 2019 RV2, 2019 RU2, 2019 RT2, 2019 RS2, 2019 RQ2, 2019 QK4, 2019 QD2, 2019 QC1, 2019 OQ2
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2019-R83 -- P/2019 R1
160Castelmartini Obs. in Italy, 6 in MPEC 2019-R82 -- 2019 GT3, 2015 RZ35, 355256, 340666, 105140, 1865
703Catalina Sky Survey in Arizona, 1 in MPEC 2019-R89 -- 2019 RT2
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2019-R91 -- 2019 RV2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2019-R82 -- 2019 QF2
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2019-R83 & 2019-R89 -- 2019 RT2, P/2019 R1
N55Corona Borealis Obs. in Tibet, 2 in MPECs 2019-R83 & 2019-R84 -- P/2019 R1, P/2007 T4
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2019-R83 -- P/2019 R1
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2019-R92 -- 2019 Q1
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2019-R92 -- 2019 Q1
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-R83 -- P/2019 R1
157Frasso Sabino Obs. in Italy, 2 in MPECs 2019-R82 & 2019-R92 -- 2019 Q1, 2019 PP1
K88GINOP-KHK in Hungary, 1 in MPEC 2019-R92 -- 2019 Q1
J95Great Shefford Obs. in England, 1 in MPEC 2019-R89 -- 2019 RT2
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2019-R83 -- P/2019 R1
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 3 in MPECs 2019-R83, 2019-R84 & 2019-R92 -- P/2019 R1, 2019 Q1, P/2007 T4
585Kiev Comet Station in Ukraine, 1 in MPEC 2019-R83 -- P/2019 R1
1861program code 1 via Kitab Obs., 1 in MPEC 2019-R83 -- P/2019 R1
Z43Landehen Obs., 1 in MPEC 2019-R82 -- 326777
C10Maisoncelles Obs. in France, 1 in MPEC 2019-R83 -- P/2019 R1
L51MARGO in Ukraine, 2 in MPECs 2019-R83 & 2019-R92 -- P/2019 R1, 2019 Q1
568^R. Wainscoat on Mauna Kea in Hawaii, 6 in MPECs 2019-R85, 2019-R86, 2019-R87, 2019-R88, 2019-R90 & 2019-R91 -- 2019 RV2, 2019 RU2, 2019 RS2, 2019 RR2, 2019 RQ2, 2019 RP2
711McDonald Obs. in Texas, 1 in MPEC 2019-R92 -- 2019 Q1
474Mt. John Obs. in New Zealand, 2 in MPECs 2019-R86 & 2019-R90 -- 2019 RU2, 2019 RQ2
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2019-R92 -- 2019 Q1
C23Olmen Obs. in Belgium, 1 in MPEC 2019-R83 -- P/2019 R1
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2019-R82, 2019-R85, 2019-R86, 2019-R87, 2019-R88, 2019-R89, 2019-R90 & 2019-R91 -- 2019 RV2, 2019 RU2, 2019 RT2, 2019 RS2, 2019 RR2, 2019 RQ2, 2019 RP2, 2019 RF, 2019 PV2
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2019-R92 -- 2019 Q1
H36Sandlot Obs. in Kansas, 1 in MPEC 2019-R92 -- 2019 Q1
C95SATINO-1 in France, 1 in MPEC 2019-R82 -- 2019 NJ5
204Schiaparelli Obs. in Italy, 1 in MPEC 2019-R89 -- 2019 RT2
G40"G. Gasparovic in Croatia via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-R83 -- P/2019 R1
G40*program code "*" (19) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-R83 -- P/2019 R1
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-R83 -- P/2019 R1
L06Sormano2 Obs. in Italy, 1 in MPEC 2019-R83 -- P/2019 R1
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-R92 -- 2019 Q1
I93St. Pardon de Conques Obs. in France, 5 in MPECs 2019-R86, 2019-R88, 2019-R89, 2019-R90 & 2019-R92 -- 2019 RU2, 2019 RT2, 2019 RS2, 2019 RQ2, 2019 Q1
I52Steward Obs. Mt. Lemmon Station in Arizona, 5 in MPECs 2019-R86, 2019-R88, 2019-R89, 2019-R90 & 2019-R92 -- 2019 RU2, 2019 RT2, 2019 RS2, 2019 RQ2, 2019 Q1
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-R82 -- 2019 RQ
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2019-R82 -- 2019 QU3
L01Visnjan Obs., 3 in MPECs 2019-R83, 2019-R87 & 2019-R92 -- 2019 RR2, P/2019 R1, 2019 Q1
718Wiggins Obs. in Utah, 1 in MPEC 2019-R83 -- P/2019 R1
I41Zwicky Transient Facility (ZTF) in southern California, 11 in MPEC 2019-R82 -- 2019 PA, 2015 RZ35, 2006 KE, 503960, 455432, 424089, 411201, 367525, 31221, 243025, 162273
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 Sentry20322105-210518.940e-08-7.35-7.350JPL: Computed at 12:28 today Pacific time based on 24 observations spanning 2.5976 days (2019-Sep-06.46136 to 2019-Sep-09.05894). Diameter approximately 0.029 km. from weighted mean H=25.36.
NEODyS20322056-211553.4e-07-6.70-6.970NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2019-09-06.462 to 2019-09-09.060."
2019 RO2NEODyS1700210826.46e-08-7.78-7.840NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2019-09-06.417 to 2019-09-08.287."
JPL Sentry04042089-211681.131383e-07-7.40-7.760JPL: Computed at 17:31 Sept. 8th Pacific time based on 9 observations spanning 1.8704 days (2019-Sep-06.41595 to 2019-Sep-08.28634). Diameter approximately 0.030 km. from weighted mean H=25.28.
2019 RC2NEODyS17002022-21183101.61e-06-4.63-5.960NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2019-09-05.424 to 2019-09-07.393."
2019 RQNEODyS17002042-204521.57e-07-9.15-9.430NEODyS: "Based on 20 optical observations (of which 1 are rejected as outliers) from 2019-09-03.409 to 2019-09-06.566."
2019 QU3JPL Sentry17002060-211721.3533e-05-6.99-7.200JPL: Computed at 06:33 today Pacific time based on 26 observations spanning 12.219 days (2019-Aug-27.34466 to 2019-Sep-08.563848). Diameter approximately 0.006 km. from weighted mean H=28.71.
NEODyS17002060-2117111.46e-05-6.86-7.070NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2019-08-27.345 to 2019-09-08.565."

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 9 September '19

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

2343Grabbed MPEC 2019-R92 - A/2019 Q1 - see above
2240Updated Traffic Report
2032Noted that JPL Sentry has posted 2019 RQ2 as an impact risk - see above
Noted that NEODyS has posted 2019 RQ2 as an impact risk - see above
1904Grabbed MPEC 2019-R87 - 2019 RR2 - see above
Grabbed MPEC 2019-R88 - 2019 RS2 - see above
Grabbed MPEC 2019-R89 - 2019 RT2 - see above
Grabbed MPEC 2019-R90 - 2019 RU2 - see above
Grabbed MPEC 2019-R91 - 2019 RV2 - see above
1807Grabbed MPEC 2019-R85 - 2019 RP2 - see above
Grabbed MPEC 2019-R86 - 2019 RQ2 - see above
1700Noted that JPL Sentry has updated its 2019 QU3 risk assessment - see above
Noted that NEODyS has updated its 2019 QU3 risk assessment - see above
Noted that NEODyS has posted 2019 RC2 as an impact risk - see above
Noted that NEODyS has posted 2019 RO2 as an impact risk - see above
Noted that NEODyS has updated its 2019 RQ risk assessment - see above
Grabbed MPEC 2019-R82 - Daily Orbit Update - see above
Grabbed MPEC 2019-R83 - Comet P/2008 Y1 = 2019 R1 (Boattini) - see above
Grabbed MPEC 2019-R84 - Comet P/2007 T4 = 2019 R2 (Gibbs) - see above
0404Noted that JPL Sentry has posted 2019 RO2 as an impact risk - see above