Contents  on 11 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 11 September '19

Nine objects reported inside ten LD

There are nine asteroids reported inside ten lunar distances (LD) of our home world today. Closest is 2019 QY4, which moves away from 3.00 to 4.22 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
1.11 LD Sept. 4 2019 RB2 10 m  9.86 to 11.29 LD Aug. 28 - today exits ten LD
1.36 LD Sept. 9 2019 RG2 11 m  6.08 to 10.95 LD Sept. 7 - 11 Moon buzzer, exits ten LD
2.50 LD yesterday 2019 QY4 10 m  3.00 to 4.22 LD Sept. 4 - 15 NHATS target
3.53 LD Sept. 4 2019 RF1 5 m  9.45 to 10.71 LD Aug. 28 - today exits ten LD
4.52 LD Sept. 7 2019 RA 28 m  6.57 to 7.54 LD Aug. 31 - Sept. 14 NHATS target - DOU
6.11 LD Sept. 6 2019 RD1 14 m  9.95 to 11.24 LD Sept. 1 - 11 exits ten LD
6.96 LD yesterday 2019 RH 22 m  7.36 to 9.31 LD Sept. 8 - 12
7.19 LD tomorrow 2019 RX2 7 m  7.19 from 7.32 LD Sept. 6 - 17
8.4   LD Sept. 20* 2019 RP2 6 m  9.1 from 9.2 LD Sept. 7 - Oct. 4 *Earth passage uncertainty
+/- 41 mins.
Approaching Traffic - sorted by 10-LD bubble entry date
9.34 LD Sept. 14 2019 RQ2 29 m  14.04 from 17.13 LD Sept. 13 - 15 risk
7.89 LD Sept. 21 2017 SL16 23 m  15.27 from 16.50 LD Sept. 16 - 25 NHATS target
4.22 LD Sept. 26 2017 KP27 23 m  16.25 from 17.30 LD Sept. 18 - Oct. 5 NHATS target

This report was generated at 1922 UTC with follow-up in today's DOU MPEC for outbound 2019 RA and departed risk-listed 2019 RX1.



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 11 September '19

The MPC's NEO Confirmation Page has 57 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 57 objects listed. Of these, 30 were "one nighters." So far The Tracking News has counted a total of 63 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 11 September '19

Minor Planet Electronic Circulars

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


MPEC 2019-R106 - "20:40 UT" - Comet C/2019 Q4 (Borisov)


MPEC 2019-R105 - "14:22 UT" - 2019 RK3


<< DOU on 11 September '19 >>  MPEC 2019-R104 - "12:09 UT" - Daily Orbit Update

Observers  on 11 September '19

A total of 47 observers appear in today's MPECs.

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 2 in MPEC 2019-R104 -- 2019 RA, 2019 QV4
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2019-R104 -- 2019 RY2, 2019 RX1, 2019 RA, 2019 QV4, 2019 GT3
T05ATLAS Haleakala in Hawaii, 3 in MPECs 2019-R104 & 2019-R106 -- 2019 RA, C/2019 Q4, 2019 PP1
T08ATLAS Mauna Loa in Hawaii, 2 in MPEC 2019-R104 -- 2019 QV4, 2006 SE6
160Castelmartini Obs. in Italy, 1 in MPEC 2019-R104 -- 2019 QV4
703Catalina Sky Survey (CSS) in Arizona, 49 in MPEC 2019-R104 -- 2019 LW1, 2016 UD101, 2016 PX66, 2010 VW75, 2010 UH7, 2008 YR27, 2006 DY, 2002 SQ, 2001 RW17, 2001 QC34, 96536, 85713, 524603, 523605, 503960, 494880, 492143, 467475, 458745, 455432, 450160, 442243, 424089, 411201, 405212, 401857, 354030, 326742, 325395, 26166, 25330, 248926, 247517, 228502, 223456, 18172, 163760, 152942, 141593, 140333, 11885, 108906, 6455, 5786, 4660, 4183, 3102, 2100, 2059
1213program code 3 via Chuguevskaya Station in Ukraine, 1 in MPEC 2019-R106 -- C/2019 Q4
850Cordell-Lorenz Obs. in Tennessee, 4 in MPECs 2019-R104 & 2019-R106 -- 2019 RY, 2019 RA, 2019 QV4, C/2019 Q4
N55Corona Borealis Obs. in Tibet, 1 in MPEC 2019-R106 -- C/2019 Q4
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2019-R106 -- C/2019 Q4
734Farpoint Obs. in Kansas, 1 in MPEC 2019-R104 -- 2019 QV4
595Farra d'Isonzo Obs. in Italy, 5 in MPECs 2019-R104 & 2019-R106 -- 2019 RA, 2019 QV4, C/2019 Q4, 2014 QQ266, 162082
203GiaGa Obs. in Italy, 1 in MPEC 2019-R104 -- 2019 RA
K88GINOP-KHK in Hungary, 1 in MPEC 2019-R104 -- 2019 QV4
J95Great Shefford Obs. in England, 2 in MPECs 2019-R105 & 2019-R106 -- 2019 RK3, C/2019 Q4
A17Guidestar Obs. in Germany, 8 in MPEC 2019-R104 -- 2019 QW3, 2019 QV4, 2019 QO5, 2019 LE5, 2017 SN14, 2013 CV83, 2002 SQ, 2001 QC34
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2019-R106 -- C/2019 Q4
Z32Javalambre Obs., 4 in MPEC 2019-R104 -- 2019 AV4, 66391, 516155, 174881
585Kiev Comet Station in Ukraine, 1 in MPEC 2019-R106 -- C/2019 Q4
1861program code 1 via Kitab Obs., 1 in MPEC 2019-R106 -- C/2019 Q4
246KLENOT in the Czech Republic, 2 in MPEC 2019-R104 -- 2019 RA, 2019 QV4
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2019-R104 -- 2019 RA
C10Maisoncelles Obs. in France, 1 in MPEC 2019-R106 -- C/2019 Q4
L51MARGO in Ukraine, 1 in MPEC 2019-R106 -- C/2019 Q4
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2019-R106 -- C/2019 Q4
711McDonald Obs. in Texas, 2 in MPEC 2019-R104 -- 2019 RA, 2019 QV4
Z66MPC code Z66, 1 in MPEC 2019-R104 -- 2019 RA
G96Mt. Lemmon Survey (MLS) in Arizona, 67 in MPECs 2019-R104 & 2019-R105 -- 2019 RK3, 2019 PG3, 2016 PX66, 2016 BA40, 2015 VL142, 2015 RZ35, 2015 RK82, 2015 PC228, 2015 HB10, 2013 CK89, 2013 AQ60, 2012 CK2, 2011 SG16, 2011 SB16, 2010 VW75, 2010 GH30, 2009 QB36, 2008 EE68, 2006 TD1, 2006 SV189, 2006 DY, 2005 UO157, 2003 SD201, 2001 RW17, 88188, 85709, 525477, 523605, 503960, 492143, 458745, 456536, 442243, 429733, 424089, 414772, 413820, 412983, 411201, 405212, 354030, 333555, 333521, 312473, 31221, 307161, 306367, 292165, 26166, 247517, 237805, 230118, 223456, 170903, 163760, 162215, 162162, 154268, 143527, 142563, 140333, 12538, 108906, 106589, 6611, 6063, 2059
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2019-R104 -- 2019 QV4
C23Olmen Obs. in Belgium, 1 in MPEC 2019-R106 -- C/2019 Q4
F51Pan-STARRS 1 (PS1) in Hawaii, 42 in MPEC 2019-R104 -- 2019 PP1, 2019 KP, 2017 XD62, 2016 CS29, 2015 TX143, 2014 QK296, 2013 CK89, 2012 PW, 2012 CK2, 2010 UH7, 2006 MX13, 2004 FF29, 2002 VP69, 88959, 88188, 53110, 530974, 525477, 501878, 471487, 470975, 458745, 442243, 437846, 380476, 378610, 339714, 326777, 309203, 306367, 292165, 255501, 230118, 220839, 216115, 190135, 162269, 112221, 6063, 6047, 4660, 2201
K63Pascoli Obs. in Italy, 3 in MPECs 2019-R104 & 2019-R106 -- C/2019 Q4, 503960, 492143
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2019-R104 -- 2019 QV4
L04ROASTERR-1 in Romania, 1 in MPEC 2019-R106 -- C/2019 Q4
K61Rokycany Obs. in the Czech Republic, 2 in MPEC 2019-R104 -- 2019 RA, 2019 QV4
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2019-R104 & 2019-R106 -- 2019 QV4, C/2019 Q4
H36Sandlot Obs. in Kansas, 5 in MPECs 2019-R104 & 2019-R106 -- 2019 RY, 2019 RK, 2019 RA, 2019 QV4, C/2019 Q4
C95SATINO-1 in France, 1 in MPEC 2019-R104 -- 2001 QC34
204Schiaparelli Obs. in Italy, 2 in MPEC 2019-R104 -- 2019 RA, 2019 QV4
G40!M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-R104 -- 2002 SQ
G40"G. Gasparovic in Croatia via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-R106 -- C/2019 Q4
G40-program code "-" (22) via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-R104 -- 2019 RC
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-R106 -- C/2019 Q4
L06Sormano2 Obs. in Italy, 1 in MPEC 2019-R106 -- C/2019 Q4
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2019-R104 -- 2019 QV4
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2019-R105 -- 2019 RK3
A71Stixendorf Obs. in Austria, 1 in MPEC 2019-R106 -- C/2019 Q4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-R104 -- 2017 XK61
L01Visnjan Obs., 4 in MPECs 2019-R104, 2019-R105 & 2019-R106 -- 2019 RK3, 2019 RA, 2019 QV4, C/2019 Q4
I41Zwicky Transient Facility (ZTF) in southern California, 11 in MPEC 2019-R104 -- 2019 RA, 2019 PA, 2015 YL10, 2009 QB36, 2001 QC34, 467475, 424089, 31221, 243025, 143947, 2212
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 RX1NEODyS15352033-204021.17e-08-7.72-7.730NEODyS: "Based on 58 optical observations (of which 1 are rejected as outliers) from 2019-09-05.383 to 2019-09-08.089."

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 11 September '19

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

2046Grabbed MPEC 2019-R106 - Comet C/2019 Q4 (Borisov) - see above
1922Generated Traffic Report
1535Noted that NEODyS has updated its 2019 RX1 risk assessment - see above
Grabbed MPEC 2019-R104 - Daily Orbit Update - see above
Grabbed MPEC 2019-R105 - 2019 RK3 - see above