Contents  on 25 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 25 September '19

Nine objects reported inside ten LD

Bulletin - 2345 UTC:  One new discovery of a close passer has been announced.

Earth passageI D~Size~Inside ten LDNotes
0.97 LD at 0636 UTC Oct. 32019 SP319 m n/a intruder - MPEC


There are nine asteroids reported inside ten lunar distances (LD) of Earth today. Nearest are 2019 SW1, heading out from 3.37 to 5.32 LD, and 2017 KP27, moving in from 4.63 to 4.30 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
0.30 LD Sept. 21 2019 SS2 2 m  7.05 to 8.95 LD Sept. 16 - 26 intruder, NHATS target
2.2   LD Sept. 30* 2019 SN3 17 m  8.0 from 9.7 LD yesterday - Oct. 6 NEW, EPU +/- 12 mins.* - MPEC
2.21 LD Sept. 22 2019 SG1 9 m  8.59 to 12.41 LD Sept. 20 - 25 exits ten LD, risk
2.99 LD yesterday 2019 SW1 12 m  3.37 to 5.32 LD Sept. 21 - 27
4.22 LD tomorrow 2017 KP27 23 m  4.30 from 4.63 LD Sept. 18 - Oct. 5 NHATS target
5.66 LD tomorrow 2019 SP2 56 m  5.79 from 6.55 LD Sept. 22 - 30 NHATS target - DOU
7.3   LD Sept. 22* 2019 SL3 12 m  8.5 to 9.4 LD Sept. 17 - 26 NEW, EPU +/- 8 mins.* - MPEC
7.89 LD Sept. 21 2017 SL16 23 m  9.74 to 10.67 LD Sept. 16 - 25 NHATS target, exits ten LD
8.45 LD Sept. 20 2019 RP2 5 m  8.63 to 8.71 LD Sept. 7 - Oct. 4 NHATS target
Approaching Traffic - sorted by 10-LD bubble entry date
3.1   LD Sept. 30* 2019 SH3 23 m  13.3 from 16.4 LD Sept. 27 - Oct. 3 NEW, EPU +/- 8 mins.* - MPEC
6.7   LD Sept. 30* 2019 SP 44 m  17.6 from 20.7 LD Sept. 28 - Oct. 3 EPU +/- 2.32 hours*
* EPU = Earth passage uncertainty

This report was generated at 2256 UTC with three discoveries: approaching 2019 SH3 (MPEC), inbound 2019 SN3 (MPEC), and outbound 2019 SL3 (MPEC). Today's DOU MPEC has follow-up for inbound 2019 SP2 and for departed risk-listed objects 2019 SF1 and 2019 RT3 (5.10 days added to 7.74-day observation arc), plus astrometry from June for 2019 KA4.



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 25 September '19

The MPC's NEO Confirmation Page has 81 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 81 objects listed. Of these, 54 were "one nighters." So far The Tracking News has counted a total of 102 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 25 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-S92 - "23:09 UT" - 2019 SP3


MPEC 2019-S91 - "22:53 UT" - 2019 SO3


MPEC 2019-S90 - "20:43 UT" - 2019 SN3


MPEC 2019-S89 - "19:19 UT" - 2019 SL3


MPEC 2019-S88 - "12:42 UT" - 2019 SJ3


MPEC 2019-S87 - "12:39 UT" - 2019 SH3


MPEC 2019-S86 - "12:35 UT" - 2019 SG3


<< DOU on 25 September '19 >>  MPEC 2019-S85 - "12:02 UT" - Daily Orbit Update


MPEC 2019-S84 - "11:37 UT" - 2019 SF3


MPEC 2019-S83 - "11:28 UT" - 2019 SE3


MPEC 2019-S82 - "11:24 UT" - 2019 SD3

Observers  on 25 September '19

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2019-S84 -- 2019 SF3
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2019-S82, 2019-S84, 2019-S86, 2019-S87, 2019-S88 & 2019-S91 -- 2019 SO3, 2019 SJ3, 2019 SH3, 2019 SG3, 2019 SF3, 2019 SD3
T05ATLAS Haleakala in Hawaii, 24 in MPECs 2019-S84 & 2019-S85 -- 2019 SF3, 2019 LW1, 2014 PF68, 90403, 89830, 66146, 489486, 455432, 405212, 401857, 326742, 325395, 25330, 243025, 162082, 153842, 152942, 137084, 9400, 6047, 5131, 3200, 2059, 1620
T08ATLAS Mauna Loa in Hawaii, 22 in MPECs 2019-S85 & 2019-S90 -- 2019 SN3, 2019 GT3, 2016 PX66, 2015 RZ35, 85709, 537342, 503960, 467475, 424089, 405212, 355256, 326777, 326742, 325395, 248926, 18172, 162181, 162082, 137084, 105140, 5626, 2059
703Catalina Sky Survey (CSS) in Arizona, 57 in MPEC 2019-S85 -- 2019 RK, 2019 QW3, 2019 PR2, 2019 PE2, 2019 OV2, 2019 MV3, 2019 LW1, 2016 PX66, 2014 NU64, 2013 CK89, 2012 PW, 2011 SG16, 2009 QB36, 2008 YR27, 2007 TQ24, 2006 DY, 2004 FF29, 2001 QC34, 96536, 89830, 85713, 85709, 68950, 523605, 503960, 495615, 481985, 481394, 467475, 411201, 405212, 354030, 340666, 339714, 326742, 325395, 318411, 31221, 25330, 252373, 251346, 248926, 247517, 237805, 228502, 223456, 196256, 163760, 162082, 152942, 141593, 112221, 108906, 6455, 6047, 2100, 2059
V06Catalina Sky Survey Kuiper Telescope in Arizona, 1 in MPEC 2019-S85 -- 2019 PR1
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2019-S84 -- 2019 SF3
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2019-S85 -- 2019 KA4
L29Drebach-South Obs., 1 in MPEC 2019-S90 -- 2019 SN3
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2019-S92 -- 2019 SP3
734Farpoint Obs. in Kansas, 1 in MPEC 2019-S82 -- 2019 SD3
E10,program code "," (21) via Faulkes Telescope South in New South Wales, 2 in MPEC 2019-S85 -- 2019 RU3, 2019 RO2
K73Gravina Obs. in Italy, 1 in MPEC 2019-S85 -- 1620
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2019-S85 -- 6047
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2019-S88 -- 2019 SJ3
G96Mt. Lemmon Survey (MLS) in Arizona, 73 in MPECs 2019-S83, 2019-S85, 2019-S88 & 2019-S91 -- 2019 SO3, 2019 SJ3, 2019 SE3, 2019 RU2, 2019 RU1, 2019 RC3, 2019 RC2, 2019 RB4, 2019 RB1, 2019 QW4, 2019 QS1, 2019 QL4, 2019 QL1, 2019 QC1, 2019 OR4, 2019 NJ6, 2019 KP, 2019 KC4, 2019 GT3, 2016 QE44, 2016 EL158, 2016 CS29, 2016 BA40, 2015 YR1, 2015 VR1, 2015 TT178, 2015 FT344, 2014 QK433, 2014 QK296, 2012 PW, 2012 CK2, 2011 SG16, 2011 SB16, 2010 OB, 2009 QB36, 2006 SE6, 2002 UZ30, 2001 UX4, 2001 QC34, 1998 FJ74, 85839, 85709, 524603, 523605, 467475, 455415, 442243, 424089, 411201, 373428, 338567, 312473, 31221, 310402, 307161, 26166, 230118, 228502, 226514, 205388, 20429, 162269, 153814, 152685, 143651, 142563, 141354, 108906, 105140, 8201, 7888, 6611, 4660
F51Pan-STARRS 1 (PS1) in Hawaii, 31 in MPECs 2019-S82, 2019-S83, 2019-S84, 2019-S85, 2019-S86, 2019-S87, 2019-S89, 2019-S90, 2019-S91 & 2019-S92 -- 2019 SP3, 2019 SO3, 2019 SN3, 2019 SL3, 2019 SH3, 2019 SG3, 2019 SF3, 2019 SE3, 2019 SD3, 2018 UY, 2016 VQ5, 2016 PX66, 2015 TX143, 2012 CP2, 2010 OB, 2007 VM243, 2006 SV189, 2002 VP69, 2000 SZ44, 96536, 88188, 85713, 526825, 488579, 401857, 26166, 223456, 108906, 6063, 4660, 3757
654Pomona College Table Mtn. Obs. in southern California, 1 in MPEC 2019-S89 -- 2019 SL3
L18QOS Obs., 1 in MPEC 2019-S85 -- 248926
H36Sandlot Obs. in Kansas, 1 in MPEC 2019-S82 -- 2019 SD3
C95SATINO-1 in France, 1 in MPEC 2019-S85 -- 2007 TQ24
K96Savelli Obs., 1 in MPEC 2019-S84 -- 2019 SF3
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2019-S85 -- 2003 SD201
I52Steward Obs. Mt. Lemmon Station in Arizona, 7 in MPECs 2019-S83, 2019-S85, 2019-S88 & 2019-S91 -- 2019 SO3, 2019 SJ3, 2019 SE3, 2019 SB1, 2019 RY, 2019 QX, 2019 PE2
A16Tentlingen Obs. in Switzerland, 5 in MPEC 2019-S85 -- 2019 GT3, 85709, 492143, 405212, 355256
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-S85 -- 2019 SF1, 2019 RT3
L01Visnjan Obs., 7 in MPECs 2019-S82, 2019-S83, 2019-S84, 2019-S85, 2019-S87, 2019-S89 & 2019-S91 -- 2019 SO3, 2019 SL3, 2019 SH3, 2019 SF3, 2019 SE3, 2019 SD3, 442243
718Wiggins Obs. in Utah, 1 in MPEC 2019-S85 -- 2019 SP2
I41Zwicky Transient Facility (ZTF) in southern California, 13 in MPEC 2019-S85 -- 2019 SM, 2006 MA, 2006 KE, 442243, 373428, 348461, 334412, 326777, 326742, 326291, 162385, 152942, 11066
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 SF1JPL Sentry1800R E M O V E DJPL: Risk listing removed at 1335 UTC today
2019 RT3JPL Sentry18002075-2115177.621377e-05-4.39-4.470JPL: Computed at 06:33 today Pacific time based on 89 observations spanning 12.836 days (2019-Sep-11.603747 to 2019-Sep-24.439472). Diameter approximately 0.032 km. from weighted mean H=25.14.
NEODyS18002075-2117441.48e-04-4.11-4.180NEODyS: "Based on 89 optical observations (of which 0 are rejected as outliers) from 2019-09-11.605 to 2019-09-24.440."

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 25 September '19

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

2311Grabbed MPEC 2019-S92 - 2019 SP3 - see above
2300Grabbed MPEC 2019-S91 - 2019 SO3 - see above
2256Generated Traffic Report
2108Grabbed MPEC 2019-S90 - 2019 SN3 - see above
1931Grabbed MPEC 2019-S89 - 2019 SL3 - see above
1800Noted that JPL Sentry has updated its 2019 RT3 risk assessment - see above
Noted that NEODyS has updated its 2019 RT3 risk assessment - see above
Noted that JPL Sentry has removed 2019 SF1 as an impact risk - see above
Grabbed MPEC 2019-S82 - 2019 SD3 - see above
Grabbed MPEC 2019-S83 - 2019 SE3 - see above
Grabbed MPEC 2019-S84 - 2019 SF3 - see above
Grabbed MPEC 2019-S85 - Daily Orbit Update - see above
Grabbed MPEC 2019-S86 - 2019 SG3 - see above
Grabbed MPEC 2019-S87 - 2019 SH3 - see above
Grabbed MPEC 2019-S88 - 2019 SJ3 - see above