Contents  on 28 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 28 September '19

Twelve objects reported inside ten LD

Bulletin - 0010, updated 0103 Sept. 29 UTC:  Two new discoveries of close passers have been announced.

Earth passageI D~Size~Inside ten LDNotes
1.38 LD at 0342 UTC Sept. 272019 SC69 m Sept. 24 - 30MPEC
7.69 LD at 1049 UTC Oct. 82019 SB615 m Oct. 4 - 12MPEC

There are a dozen small celestial objects reported to be less than ten lunar distances (LD) from our home world today. The three closest are risk-listed 2019 SU3, moving out from 3.23 to 3.64 LD, 2019 SN3 inbound from about 4.8 to 3.4 LD, and 2017 KP27, outbound from 4.40 to 4.80 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
0.97 LD Oct. 3 2019 SP3 17 m  8.27 from 10.18 LD today - Oct. 8 intruder, enters ten LD, risk - DOU
1.92 LD Sept. 26 2019 SW5 30 m  5.81 to 8.97 LD Sept. 23 - 29 NEW - MPEC
2.2   LD Sept. 30* 2019 SN3 17 m  3.4 from 4.8 LD Sept. 24 - Oct. 6 *Earth passage uncertainty +/- 7 mins.
2.36 LD Sept. 24 2019 SU3 14 m  3.23 to 3.64 LD Sept. 6 - Oct. 10 NHATS target, risk - DOU
3.13 LD Sept. 30 2019 SH3 24 m  4.61 from 7.28 LD yesterday - Oct. 3 DOU
4.22 LD Sept. 26 2017 KP27 23 m  4.40 to 4.80 LD Sept. 18 - Oct. 5 NHATS target
4.82 LD Sept. 21 2019 SB5 8 m  9.30 to 10.36 LD Sept. 13 - 28 NEW, exits ten LD - MPEC
5.65 LD tomorrow 2019 SE5 14 m  5.67 from 5.99 LD Sept. 23 - Oct. 4 NEW - MPEC
5.66 LD Sept. 26 2019 SP2 56 m  6.41 to 7.63 LD Sept. 22 - 30 NHATS target
6.52 LD tomorrow 2019 SN4 45 m  7.64 from 10.62 LD today - Oct. 1 enters ten LD - DOU
6.61 LD Sept. 30 2019 SP 43 m  8.84 from 11.37 LD today - Oct. 2 enters ten LD
8.45 LD Sept. 20 2019 RP2 5 m  8.93 to 9.06 LD Sept. 7 - Oct. 4 NHATS target
Approaching Traffic
8.63 LD Oct. 2 2019 SX3 29 m  10.74 from 12.02 LD tomorrow - Oct. 4 DOU

This report was updated at 2304 UTC with the discovery of outbound 2019 SW5 (MPEC). Your first local flying rocks traffic report was generated at 1810 UTC with the discoveries of inbound 2019 SE5 (MPEC) and outbound 2019 SB5 (MPEC), and with follow-up in today's DOU MPEC for approaching 2019 SX3, three inbound objects: 2019 SN4, 2019 SH3, and risk-listed intruder 2019 SP3, outbound risk-listed 2019 SU3, and departed 2019 SK1 plus additional observation from March 2018 of risk-listed 2018 EE9 (4.64 days added to previous 13.65-day observation span).



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 28 September '19

The MPC's NEO Confirmation Page has 93 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 93 objects listed. Of these, 55 were "one nighters." So far The Tracking News has counted a total of 131 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 28 September '19

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been 23 MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2019-S144 - "23:32 UT" - 2019 SC6


MPEC 2019-S143 - "23:30 UT" - 2019 SB6


MPEC 2019-S142 - "23:27 UT" - 2019 SA6


MPEC 2019-S141 - "23:25 UT" - 2019 SZ5


MPEC 2019-S140 - "23:23 UT" - 2019 SY5


MPEC 2019-S139 - "23:20 UT" - 2019 SX5


MPEC 2019-S138 - "20:52 UT" - 2019 SW5


MPEC 2019-S137 - "16:15 UT" - 2019 SS5


MPEC 2019-S136 - "16:13 UT" - 2019 SR5


MPEC 2019-S135 - "16:11 UT" - 2019 SQ5


MPEC 2019-S134 - "16:07 UT" - 2019 SP5


MPEC 2019-S133 - "16:06 UT" - 2019 SO5


MPEC 2019-S132 - "16:03 UT" - 2019 SN5


MPEC 2019-S131 - "12:38 UT" - 2019 SG5


MPEC 2019-S130 - "12:34 UT" - 2019 SF5


MPEC 2019-S129 - "12:19 UT" - 2019 SE5


<< DOU on 28 September '19 >>  MPEC 2019-S128 - "12:04 UT" - Daily Orbit Update


MPEC 2019-S127 - "02:17 UT" - 2019 SC5


MPEC 2019-S126 - "02:15 UT" - 2019 SB5


MPEC 2019-S125 - "02:13 UT" - 2019 SA5


MPEC 2019-S124 - "02:10 UT" - 2019 SZ4


MPEC 2019-S123 - "02:08 UT" - 2019 SY4


MPEC 2019-S122 - "00:17 UT" - 2019 SX4

Observers  on 28 September '19

A total of 34 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPECs 2019-S123, 2019-S125, 2019-S126, 2019-S129, 2019-S130, 2019-S131, 2019-S132, 2019-S133, 2019-S134, 2019-S135, 2019-S136, 2019-S137, 2019-S138, 2019-S139, 2019-S141 & 2019-S142 -- 2019 SZ5, 2019 SY4, 2019 SX5, 2019 SW5, 2019 SS5, 2019 SR5, 2019 SQ5, 2019 SP5, 2019 SO5, 2019 SN5, 2019 SG5, 2019 SF5, 2019 SE5, 2019 SB5, 2019 SA6, 2019 SA5
T08ATLAS Mauna Loa in Hawaii, 2 in MPECs 2019-S129 & 2019-S138 -- 2019 SW5, 2019 SE5
160Castelmartini Obs. in Italy, 11 in MPEC 2019-S128 -- 2019 GT3, 2014 XX7, 2009 QB36, 2001 QC34, 537342, 503960, 442243, 248926, 141593, 105140, 1620
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2019-S131 -- 2019 SG5
Z99Clixby Obs. in England, 2 in MPECs 2019-S129 & 2019-S138 -- 2019 SW5, 2019 SE5
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2019-S129 & 2019-S138 -- 2019 SW5, 2019 SE5
W84%program code "%" (14) via DECam in Chile, 1 in MPEC 2019-S128 -- 2018 EE9
L29Drebach-South Obs., 2 in MPECs 2019-S129 & 2019-S138 -- 2019 SW5, 2019 SE5
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 8 in MPECs 2019-S124, 2019-S125, 2019-S126, 2019-S128, 2019-S136, 2019-S139, 2019-S143 & 2019-S144 -- 2019 SZ4, 2019 SX5, 2019 SU3, 2019 SR5, 2019 SC6, 2019 SB6, 2019 SB5, 2019 SA5
K83Forti Obs., 2 in MPECs 2019-S128 & 2019-S138 -- 2019 SW5, 248926
X31Galilei Obs., 2 in MPECs 2019-S129 & 2019-S138 -- 2019 SW5, 2019 SE5
E89Geyserland Obs. in New Zealand, 2 in MPEC 2019-S128 -- 66146, 7482
203GiaGa Obs. in Italy, 1 in MPEC 2019-S142 -- 2019 SA6
K88GINOP-KHK in Hungary, 4 in MPEC 2019-S128 -- 2019 SX3, 2019 SN4, 2019 SM4, 2017 MN8
K73Gravina Obs. in Italy, 2 in MPEC 2019-S128 -- 442243, 1620
J95Great Shefford Obs. in England, 4 in MPECs 2019-S123, 2019-S129, 2019-S138 & 2019-S142 -- 2019 SY4, 2019 SW5, 2019 SE5, 2019 SA6
W85LCO Cerro Tololo A in Chile, 1 in MPEC 2019-S141 -- 2019 SZ5
H01Magdalena Ridge Obs. (MRO) in New Mexico, 12 in MPECs 2019-S122, 2019-S125, 2019-S127, 2019-S130, 2019-S132, 2019-S133, 2019-S136, 2019-S137, 2019-S139, 2019-S142, 2019-S143 & 2019-S144 -- 2019 SX5, 2019 SX4, 2019 SS5, 2019 SR5, 2019 SO5, 2019 SN5, 2019 SF5, 2019 SC6, 2019 SC5, 2019 SB6, 2019 SA6, 2019 SA5
932McCarthy Obs. in Connecticut, 2 in MPECs 2019-S129 & 2019-S138 -- 2019 SW5, 2019 SE5
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2019-S132, 2019-S138, 2019-S143 & 2019-S144 -- 2019 SW5, 2019 SN5, 2019 SC6, 2019 SB6
J69North Obs. in England, 4 in MPECs 2019-S128 & 2019-S138 -- 2019 SW5, 2019 SV4, 2019 SU3, 2019 SH3
Z80Northolt Branch Obs. in England, 2 in MPECs 2019-S129 & 2019-S138 -- 2019 SW5, 2019 SE5
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2019-S138 -- 2019 SW5
F51Pan-STARRS 1 (PS1) in Hawaii, 17 in MPECs 2019-S122, 2019-S123, 2019-S124, 2019-S125, 2019-S126, 2019-S127, 2019-S130, 2019-S131, 2019-S133, 2019-S134, 2019-S135, 2019-S136, 2019-S137, 2019-S139, 2019-S140, 2019-S141 & 2019-S142 -- 2019 SZ5, 2019 SZ4, 2019 SY5, 2019 SY4, 2019 SX5, 2019 SX4, 2019 SS5, 2019 SR5, 2019 SQ5, 2019 SP5, 2019 SO5, 2019 SG5, 2019 SF5, 2019 SC5, 2019 SB5, 2019 SA6, 2019 SA5
K63Pascoli Obs. in Italy, 1 in MPEC 2019-S142 -- 2019 SA6
L04ROASTERR-1 in Romania, 2 in MPECs 2019-S129 & 2019-S138 -- 2019 SW5, 2019 SE5
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2019-S129 & 2019-S138 -- 2019 SW5, 2019 SE5
C95SATINO-1 in France, 1 in MPEC 2019-S128 -- 2019 QV4
K96Savelli Obs., 3 in MPECs 2019-S123, 2019-S129 & 2019-S138 -- 2019 SY4, 2019 SW5, 2019 SE5
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2019-S128, 2019-S131, 2019-S136 & 2019-S137 -- 2019 SS5, 2019 SR5, 2019 SG5, 2019 LX4
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2019-S128, 2019-S130, 2019-S132 & 2019-S135 -- 2019 SQ5, 2019 SP1, 2019 SN5, 2019 SK1, 2019 SF5
I52Steward Obs. Mt. Lemmon Station in Arizona, 5 in MPECs 2019-S132, 2019-S139, 2019-S140, 2019-S143 & 2019-S144 -- 2019 SY5, 2019 SX5, 2019 SN5, 2019 SC6, 2019 SB6
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-S128 -- 2019 SU3, 2019 SP3
L01Visnjan Obs., 10 in MPECs 2019-S122, 2019-S123, 2019-S124, 2019-S125, 2019-S127, 2019-S129, 2019-S132, 2019-S134, 2019-S138 & 2019-S143 -- 2019 SZ4, 2019 SY4, 2019 SX4, 2019 SW5, 2019 SP5, 2019 SN5, 2019 SE5, 2019 SC5, 2019 SB6, 2019 SA5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 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 SU3JPL Sentry16002078-2119390.00177589051-4.07-4.170JPL: Computed at 08:09 today Pacific time based on 43 observations spanning 4.7310 days (2019-Sep-23.249638 to 2019-Sep-27.980607). Diameter approximately 0.014 km. from weighted mean H=26.92.
2019 SP3JPL Sentry16002046-211324.107383e-05-4.90-4.900JPL: Computed at 07:59 today Pacific time based on 11 observations spanning 5.0361 days (2019-Sep-22.2851 to 2019-Sep-27.321225). Diameter approximately 0.017 km. from weighted mean H=26.47.
2018 EE9JPL Sentry16002067-2115266.292266e-06-5.97-6.120JPL: Computed at 08:02 today Pacific time based on 14 observations spanning 18.286 days (2018-Mar-08.028 to 2018-Mar-26.31435). Diameter approximately 0.018 km. from weighted mean H=26.34.
2014 HG196JPL Sentry16002054-210191.5555e-07-7.08-7.490JPL: Computed at 04:09 today Pacific time based on 26 observations spanning 3.0211 days (2014-Apr-23.08628 to 2014-Apr-26.10742). Diameter approximately 0.024 km. from weighted mean H=25.70.

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 28 September '19

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

2358Grabbed MPEC 2019-S139 - 2019 SX5 - see above
Grabbed MPEC 2019-S140 - 2019 SY5 - see above
Grabbed MPEC 2019-S141 - 2019 SZ5 - see above
Grabbed MPEC 2019-S142 - 2019 SA6 - see above
Grabbed MPEC 2019-S143 - 2019 SB6 - see above
Grabbed MPEC 2019-S144 - 2019 SC6 - see above
2304Updated Traffic Report
2100Grabbed MPEC 2019-S138 - 2019 SW5 - see above
1635Grabbed MPEC 2019-S132 - 2019 SN5 - see above
Grabbed MPEC 2019-S133 - 2019 SO5 - see above
Grabbed MPEC 2019-S134 - 2019 SP5 - see above
Grabbed MPEC 2019-S135 - 2019 SQ5 - see above
Grabbed MPEC 2019-S136 - 2019 SR5 - see above
Grabbed MPEC 2019-S137 - 2019 SS5 - see above
1600Noted that JPL Sentry has updated its 2014 HG196 risk assessment - see above
Noted that JPL Sentry has updated its 2018 EE9 risk assessment - see above
Noted that JPL Sentry has updated its 2019 SP3 risk assessment - see above
Noted that JPL Sentry has updated its 2019 SU3 risk assessment - see above
Grabbed MPEC 2019-S128 - Daily Orbit Update - see above
Grabbed MPEC 2019-S129 - 2019 SE5 - see above
Grabbed MPEC 2019-S130 - 2019 SF5 - see above
Grabbed MPEC 2019-S131 - 2019 SG5 - see above
0530Grabbed MPEC 2019-S123 - 2019 SY4 - see above
Grabbed MPEC 2019-S124 - 2019 SZ4 - see above
Grabbed MPEC 2019-S125 - 2019 SA5 - see above
Grabbed MPEC 2019-S126 - 2019 SB5 - see above
Grabbed MPEC 2019-S127 - 2019 SC5 - see above
0018Grabbed MPEC 2019-S122 - 2019 SX4 - see above