Contents  on 4 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 4 October '19

Twenty objects reported inside ten LD

Today there are twenty visitors reported to be less than ten lunar distances (LD) from our home world. Three of them are inside Earth's sphere of gravitational influence (SOI). Newly announced risk-listed 2019 TX comes its closest to us on this passage, reaching 1.25 LD, while the other two leave the SOI. 2019 TK heads off from 1.69 to 4.47 LD, and risk-listed intruder 2019 SP3 moves from 1.71 to 3.47 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
0.34 LD Sept. 29 2019 TD 5 m  9.33 to 11.54 LD Sept. 25 - today intruder, exits ten LD, risk - DOU
0.41 LD Oct. 1 2019 SM8 5 m  7.67 to 10.83 LD Sept. 28 - today intruder, exits ten LD, risk
0.97 LD yesterday 2019 SP3 19 m  1.71 to 3.47 LD Sept. 28 - Oct. 8 intruder, exits Earth SOI, risk
1.17 LD Sept. 29 2019 TA 4 m  6.64 to 8.01 LD Sept. 22 - Oct. 6 NHATS target - DOU
1.22 LD yesterday 2019 TK 8 m  1.69 to 4.47 LD Sept. 30 - Oct. 6 exits Earth SOI - DOU
1.25 LD today 2019 TX 6 m  1.25 LD Sept. 28 - Oct. 11 NEW, NHATS target, Moon closest 2.22 LD at 2026
UTC, Earth closest at 2336 UTC, risk - MPEC
1.39 LD Oct. 2 2019 SD8 11 m  4.83 to 7.20 LD Sept. 28 - Oct. 6
2.20 LD Sept. 30 2019 SN3 16 m  6.42 to 8.05 LD Sept. 24 - Oct. 6
2.36 LD Sept. 24 2019 SU3 13 m  6.16 to 6.70 LD Sept. 6 - Oct. 10 NHATS target, risk - DOU
4.11 LD tomorrow 2019 TV 8 m  4.16 from 4.89 LD Sept. 30 - Oct. 9 NEW - MPEC
4.22 LD Sept. 26 2017 KP27 23 m  8.65 to 9.60 LD Sept. 18 - tomorrow NHATS target
4.4   LD Oct. 8* 2019 TU 20 m  8.4 from 10.4 LD today - Oct. 12 NEW, EPU +/- 44 mins.*, NHATS target, enters ten
LD, risk - MPEC, DOU
4.50 LD Oct. 2 2019 TW 10 m  4.63 to 4.89 LD Sept. 21 - Oct. 13 NEW, NHATS target - MPEC
4.5   LD yesterday* 2019 SH9 9 m  5.1 to 7.2 LD Sept. 30 - tomorrow EPU +/- 43 mins.*
5.65 LD Sept. 29 2019 SE5 15 m  8.98 to 10.18 LD Sept. 23 - today exits ten LD
7.75 LD Oct. 8 2019 SB6 15 m  9.90 from 11.09 LD today - Oct. 12 NHATS target, enters ten LD
7.77 LD Oct. 1 2019 SJ9 13 m  9.08 to 10.18 LD Sept. 28 - today exits ten LD
7.87 LD yesterday 2019 SL8 23 m  8.30 to 9.67 LD Oct. 1 - 5
8.45 LD Sept. 20 2019 RP2 5 m  9.91 to 10.11 LD Sept. 7 - today NHATS target, exits ten LD
8.63 LD Oct. 2 2019 SX3 29 m  9.28 to 10.17 LD Sept. 29 - today exits ten LD

This report was generated at 1955 UTC with eight discoveries. Four are from late yesterday: Approaching 2019 TS (MPEC, DOU), inbound objects 2019 TV (MPEC) and risk-listed 2019 TU (MPEC, DOU), and outbound 2019 TW (MPEC). Today's four are approaching objects 2019 TC1 (MPEC) and 2019 TZ (MPEC), passing risk-listed 2019 TX (MPEC), and already departed risk-listed 2019 TF1 (MPEC), which flew by at about 8.1 LD* on September 26th (approach uncertainty +/- 2.85 hours). Today's DOU MPEC has the precovery of 2007 DB61 from March 1999, follow-up for six objects in the active traffic tables here, and follow-up for five departed objects: 2019 ST8, 2019 SH3, 2017 SL16, and including risk-listed 2019 TB and 2019 SD, plus follow-up for distant 163899 2003 SD220.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
3.5   LD Oct. 8* 2019 TC1 12 m  10.8 from 13.7 LD tomorrow - Oct. 11 NEW, EPU +/- 50 mins.* - MPEC
8.40 LD Oct. 8 2019 TS 27 m  10.51 from 11.65 LD tomorrow - Oct. 11 NEW - MPEC, DOU
1.4   LD Oct. 9* 2019 SL7 21 m  17.7 from 21.6 LD Oct. 7 - 12 EPU +/- 9 mins.*, risk
8.0   LD Oct. 9* 2019 TZ 15 m  14.0 from 16.2 LD Oct. 7 - 11 NEW, EPU +/- 9 mins.* - MPEC
9.39 LD Oct. 8 2019 TM 37 m  13.84 from 16.09 LD Oct. 7 - 9 DOU
8.6   LD Oct. 12* 2019 SV9 29 m  25.6 from 28.5 LD Oct. 11 - 14 EPU +/- 1.63 hours*
*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. "Distant" is used here to describe an object under observation that has approached Earth within ten LD since A/CC began these traffic reports twelve-plus years ago but is not currently coming so close. 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.

Radar Astrometry  on 4 October '19

Radar observation of two objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2303 UTC when the database was dated 4 Oct.


Data update noted at 2330 UTC when the database was dated 4 Oct.



Photometry and some astrometry is needed for upcoming radar targets. See Arecibo and Goldstone schedules.

NEOCP Activity  on 4 October '19

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 68 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 4 October '19

Minor Planet Electronic Circulars

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


MPEC 2019-T83 - "17:57 UT" - A/2019 S4


MPEC 2019-T82 - "17:30 UT" - Comet P/2019 S3 (Panstarrs)


MPEC 2019-T81 - "17:15 UT" - 2019 TK1


MPEC 2019-T80 - "16:55 UT" - Comet P/2019 S2 (Panstarrs)


MPEC 2019-T79 - "12:55 UT" - 2019 TF1


MPEC 2019-T78 - "12:53 UT" - 2019 TE1


MPEC 2019-T77 - "12:49 UT" - 2019 SW10


<< DOU on 4 October '19 >>  MPEC 2019-T76 - "12:18 UT" - Daily Orbit Update


MPEC 2019-T75 - "06:26 UT" - 2019 TC1


MPEC 2019-T74 - "05:17 UT" - 2019 SV10


MPEC 2019-T73 - "05:15 UT" - 2019 TA1


MPEC 2019-T72 - "05:13 UT" - 2019 TZ


MPEC 2019-T71 - "04:57 UT" - 2019 TY


MPEC 2019-T70 - "00:02 UT" - 2019 TX

Observers  on 4 October '19

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

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2019-T76 -- 153842
J57Alto Turia Obs. in Spain, 1 in MPEC 2019-T82 -- P/2019 S3
251Arecibo in Puerto Rico, 2 in radar -- 2019 SE8, 2019 SD8
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2019-T73, 2019-T75, 2019-T76, 2019-T77, 2019-T78 & 2019-T81 -- 2019 TM, 2019 TK1, 2019 TE1, 2019 TC1, 2019 TA1, 2019 SW10
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2019-T76 -- 2019 SH3
T08ATLAS Mauna Loa in Hawaii, 8 in MPECs 2019-T76 & 2019-T81 -- 2019 TK1, 2009 SP, 2006 DY, 66146, 153842, 136993, 9400, 2100
B88Bigmuskie Obs. in Italy, 1 in MPEC 2019-T76 -- 36236
X74Campo dos Amarais Obs., 1 in MPEC 2019-T76 -- 2016 AU130
160Castelmartini Obs. in Italy, 9 in MPEC 2019-T76 -- 2015 RZ35, 2014 PF68, 90403, 355256, 326777, 163760, 105140, 1865, 1620
703Catalina Sky Survey (CSS) in Arizona, 52 in MPECs 2019-T70, 2019-T76 & 2019-T81 -- 2019 TX, 2019 TK1, 2019 SZ, 2019 SX5, 2019 ST8, 2019 SH1, 2019 SF3, 2019 SE2, 2019 SC9, 2019 NZ2, 2019 NT6, 2019 MV3, 2019 LK5, 2016 PX66, 2016 EX27, 2014 XX7, 2014 NU64, 2013 CK89, 2008 YR27, 2008 SR1, 2007 TQ24, 2006 SK134, 88959, 85713, 85709, 537342, 524603, 494880, 467475, 458745, 411201, 395289, 378610, 369264, 334412, 307161, 25330, 252793, 228502, 218863, 170502, 163899, 163760, 162162, 152942, 108906, 106589, 7092, 6047, 5693, 2059, 1627
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2019-T80 -- P/2019 S2
C13Como Obs. in Italy, 1 in MPEC 2019-T76 -- 2010 UH7
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2019-T76 & 2019-T81 -- 2019 TM, 2019 TK1
958Dax Obs. in France, 1 in MPEC 2019-T70 -- 2019 TX
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-T70 -- 2019 TX
K88GINOP-KHK in Hungary, 1 in MPEC 2019-T83 -- 2019 S4
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2019-T83 -- 2019 S4
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 2 in MPECs 2019-T80 & 2019-T82 -- P/2019 S3, P/2019 S2
711McDonald Obs. in Texas, 3 in MPECs 2019-T81, 2019-T82 & 2019-T83 -- 2019 TK1, 2019 S4, P/2019 S3
474Mt. John Obs. in New Zealand, 8 in MPEC 2019-T76 -- 2019 RD, 2019 OZ, 2019 GJ5, 2017 SL16, 2013 CK89, 2012 HR69, 2012 BE86, 2009 DR36
G96Mt. Lemmon Survey (MLS) in Arizona, 39 in MPECs 2019-T71, 2019-T72, 2019-T73, 2019-T74, 2019-T75, 2019-T76, 2019-T77, 2019-T78, 2019-T79, 2019-T82 & 2019-T83 -- 2019 TZ, 2019 TY, 2019 TF1, 2019 TE1, 2019 TC1, 2019 TA1, 2019 SX5, 2019 SW10, 2019 SV10, 2019 SQ4, 2019 SL4, 2019 SK8, 2019 SJ6, 2019 SF3, 2019 S4, P/2019 S3, 2019 NZ2, 2019 KB2, 2015 OB79, 2014 QK296, 2008 SR1, 2007 TQ24, 2006 SV189, 2006 SK134, 2006 SE6, 88188, 525477, 524603, 414772, 411201, 380476, 307161, 306367, 252399, 228502, 152942, 8201, 7888, 6063
Z80Northolt Branch Obs. in England, 4 in MPEC 2019-T76 -- 2019 TK, 99248, 3200, 2059
C27Pallerols Obs. in Spain, 3 in MPEC 2019-T76 -- 326777, 163051, 1865
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2019-T70, 2019-T71, 2019-T74, 2019-T76, 2019-T77, 2019-T80 & 2019-T82 -- 2019 TY, 2019 TX, 2019 SW10, 2019 SV10, P/2019 S3, P/2019 S2, 2019 AH11, 2016 WQ48
F52Pan-STARRS 2 in Hawaii, 1 in MPEC 2019-T82 -- P/2019 S3
K63Pascoli Obs. in Italy, 3 in MPECs 2019-T70, 2019-T76 & 2019-T81 -- 2019 TX, 2019 TS, 2019 TK1
B49Paus Obs. in Spain, 1 in MPEC 2019-T70 -- 2019 TX
654Pomona College Table Mtn. Obs. (PCTMO) in southern California, 2 in MPEC 2019-T76 -- 2019 TR, 1620
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2019-T82 -- P/2019 S3
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2019-T70 & 2019-T81 -- 2019 TX, 2019 TK1
C95SATINO-1 in France, 1 in MPEC 2019-T76 -- 3102
204Schiaparelli Obs. in Italy, 4 in MPECs 2019-T76 & 2019-T81 -- 2019 TK1, 2019 QY3, 2019 JF1, 2014 XX7
645Sloan Digital Sky Survey (SDSS) in New Mexico, 4 in MPEC 2019-T76 -- 2014 HR184, 2007 DB61, 454101, 417217
691Spacewatch 0.9m telescope in Arizona, 13 in MPECs 2019-T76, 2019-T80 & 2019-T82 -- 2019 TB, 2019 TA, 2019 SU3, 2019 SF2, P/2019 S3, P/2019 S2, 2019 GT3, 2019 FV2, 2015 RH2, 2014 XX7, 2014 PF68, 2014 NU64, 2006 SE6
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2019-T76, 2019-T80 & 2019-T82 -- 2019 TD, 2019 SD, P/2019 S3, P/2019 S2, 2016 WJ1
L39Spica Obs., 1 in MPEC 2019-T76 -- 450160
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2019-T76 & 2019-T81 -- 2019 TK1, 2001 QC34
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2019-T70, 2019-T76 & 2019-T81 -- 2019 TX, 2019 TU, 2019 TK1
I52Steward Obs. Mt. Lemmon Station in Arizona, 20 in MPECs 2019-T70, 2019-T73, 2019-T75, 2019-T76, 2019-T78, 2019-T79, 2019-T81 & 2019-T83 -- 2019 TX, 2019 TK1, 2019 TF1, 2019 TE1, 2019 TC1, 2019 TC, 2019 TB, 2019 TA1, 2019 SY4, 2019 SV5, 2019 SU3, 2019 SH8, 2019 SF9, 2019 SE2, 2019 SD2, 2019 SB3, 2019 SA3, 2019 S4, 2019 RA2, 2016 EX27
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-T76 -- 2019 QS6, 2019 QK7
L01Visnjan Obs., 6 in MPECs 2019-T71, 2019-T72, 2019-T74, 2019-T81, 2019-T82 & 2019-T83 -- 2019 TZ, 2019 TY, 2019 TK1, 2019 SV10, 2019 S4, P/2019 S3
I41Zwicky Transient Facility (ZTF) in southern California, 15 in MPEC 2019-T76 -- 2010 UH7, 96590, 86067, 68350, 442243, 425047, 373428, 370307, 276397, 243025, 152931, 137805, 11066, 5693, 4487
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 TF1JPL Sentry16152054-2113151.392468e-07-8.20-8.800JPL: Computed at 07:06 today Pacific time based on 11 observations spanning 1.1244 days (2019-Oct-03.20388 to 2019-Oct-04.32828). Diameter approximately 0.011 km. from weighted mean H=27.39.
NEODyS16152041-207223.26e-10-10.46-10.50NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2019-10-03.205 to 2019-10-04.329."
2019 TXNEODyS1615207612.92e-09-10.51-10.510NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2019-09-24.417 to 2019-10-03.978."
2019 TUJPL Sentry16152033-21192068.53737477000001e-05-4.70-5.480JPL #2 for the day: Computed at 07:15 today Pacific time based on 17 observations spanning .71069 days (2019-Oct-03.26434 to 2019-Oct-03.97503). Diameter approximately 0.020 km. from weighted mean H=26.09.
NEODyS16152031-21183431.0e-04-4.60-5.480NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2019-10-03.265 to 2019-10-03.976."
2019 TDJPL Sentry16152042-206021.5578e-06-7.70-7.870JPL: Computed at 07:02 today Pacific time based on 21 observations spanning 3.1437 days (2019-Oct-01.3317 to 2019-Oct-04.47542). Diameter approximately 0.005 km. from weighted mean H=29.13.
NEODyS16152032-206063.81e-06-7.31-7.510NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2019-10-01.333 to 2019-10-04.476."
2019 TBJPL Sentry16152093-209313.992e-10-10.70-10.70JPL: Computed at 07:05 today Pacific time based on 26 observations spanning 3.0242 days (2019-Oct-01.18542 to 2019-Oct-04.2096). Diameter approximately 0.013 km. from weighted mean H=27.03.
2019 SE8JPL Sentry2303R E M O V E DJPL: Risk listing removed at 2300 UTC today
2019 SU3JPL Sentry16152084-2119450.00488403561-3.69-3.740JPL: Computed at 07:10 today Pacific time based on 85 observations spanning 11.211 days (2019-Sep-23.249638 to 2019-Oct-04.46067). Diameter approximately 0.013 km. from weighted mean H=27.10.
NEODyS16152084-21181894.81e-03-3.69-3.70NEODyS: "Based on 86 optical observations (of which 1 are rejected as outliers) from 2019-09-23.250 to 2019-10-04.461."
2019 SDJPL Sentry16152080-208018.422e-05-4.43-4.430JPL: Computed at 07:25 today Pacific time based on 119 observations spanning 16.964 days (2019-Sep-17.240317 to 2019-Oct-04.20411). Diameter approximately 0.028 km. from weighted mean H=25.42.
NEODyS1615208013.73e-05-4.79-4.790NEODyS: "Based on 119 optical observations (of which 1 are rejected as outliers) from 2019-09-17.241 to 2019-10-04.205."
2016 WJ1NEODyS16152104-211262.76e-07-4.97-5.610NEODyS: "Based on 413 optical observations (of which 2 are rejected as outliers) from 2003-07-04.606 to 2019-10-03.505."
2007 FT3JPL Sentry04302024-21161641.364327e-06-3.07-3.730JPL: Computed at 04:14 April 11th of 2017 Pacific time based on 14 observations spanning 1.2324 days (2007-Mar-20.45448 to 2007-Mar-21.68686). Diameter approximately 0.340 km. from weighted mean H=19.97.

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 4 October '19

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

2330Noted Radar Astrometry database update - see above
2303Noted that JPL Sentry has removed 2019 SE8 as an impact risk - see above
Noted Radar Astrometry database update - see above
1955Generated Traffic Report
1833Grabbed MPEC 2019-T82 - Comet P/2019 S3 (Panstarrs) - see above
Grabbed MPEC 2019-T83 - A/2019 S4 - see above
1730Grabbed MPEC 2019-T81 - 2019 TK1 - see above
1700Grabbed MPEC 2019-T80 - Comet P/2019 S2 (Panstarrs) - see above
1615Noted that NEODyS has updated its 2016 WJ1 risk assessment - see above
Noted that JPL Sentry has updated its 2019 SD risk assessment - see above
Noted that NEODyS has updated its 2019 SD risk assessment - see above
Noted that JPL Sentry has updated its 2019 SU3 risk assessment - see above
Noted that NEODyS has updated its 2019 SU3 risk assessment - see above
Noted that JPL Sentry has updated its 2019 TB risk assessment - see above
Noted that JPL Sentry has updated its 2019 TD risk assessment - see above
Noted that NEODyS has updated its 2019 TD risk assessment - see above
Noted that JPL Sentry has posted 2019 TF1 as an impact risk - see above
Noted that NEODyS has posted 2019 TF1 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 TU risk assessment - see above
Noted that NEODyS has posted 2019 TU as an impact risk - see above
Noted that NEODyS has posted 2019 TX as an impact risk - see above
Grabbed MPEC 2019-T75 - 2019 TC1 - see above
Grabbed MPEC 2019-T76 - Daily Orbit Update - see above
Grabbed MPEC 2019-T77 - 2019 SW10 - see above
Grabbed MPEC 2019-T78 - 2019 TE1 - see above
Grabbed MPEC 2019-T79 - 2019 TF1 - see above
0600Grabbed MPEC 2019-T72 - 2019 TZ - see above
Grabbed MPEC 2019-T73 - 2019 TA1 - see above
Grabbed MPEC 2019-T74 - 2019 SV10 - see above
0500Grabbed MPEC 2019-T71 - 2019 TY - see above
0430Noted that JPL Sentry has updated its 2007 FT3 risk assessment - see above
Noted that JPL Sentry has posted 2019 TU as an impact risk - see above
0009Grabbed MPEC 2019-T70 - 2019 TX - see above