Contents  on 21 September '19

NOTE:  These A/CC news pages will update only intermittently for a few days. All discoveries and observing credits will be reported, but we may miss some interim impact risk assessments and undercount NEOCP objects, and there may be some days without a traffic report for Earth's Busy Neighborhood.

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 21 September '19

Nine objects reported inside ten LD

Nine visitors are reported to be within ten lunar distances (LD) of Earth today. Two newly announced objects are inside our planet's sphere of gravitational influence. Intruder 2019 SD1 comes its closest this time around, passing at 0.73 LD and missing the Moon by 0.25 LD, while risk-listed 2019 SX also comes its closest, reaching 1.10 LD from Earth.

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
0.64 LD Sept. 16 2019 SJ 11 m  8.10 to 10.01 LD Sept. 11 - 21 intruder, NHATS target, exits ten LD, risk
0.73 LD today 2019 SD1 7 m  0.73 LD Sept. 19 - 23 NEW, intruder today, Moon closest 0.25 LD at
0534 UTC, Earth closest at 0645 UTC - MPEC
1.10 LD today 2019 SX 4 m  1.10 LD Sept. 18 - 24 NEW, Moon closest 2.08 LD at 1458 UTC, Earth
closest at 1645 UTC, risk - MPEC, DOU
1.40 LD Sept. 19 2019 SC 12 m  3.96 to 6.87 LD Sept. 16 - 23 Moon buzzer, risk
2.21 LD tomorrow 2019 SG1 9 m  4.09 from 7.69 LD yesterday - Sept. 25 NEW, risk - MPEC
4.22 LD Sept. 26 2017 KP27 23 m  6.58 from 7.42 LD Sept. 18 - Oct. 5 NHATS target
5.50 LD yesterday 2019 ST 44 m  5.56 to 6.64 LD Sept. 17 - 23 DOU
7.89 LD today 2017 SL16 23 m  7.89 LD Sept. 16 - 25 NHATS target, Earth closest at 0211 UTC
8.5   LD yesterday* 2019 RP2 5 m  8.5 to 8.5 LD Sept. 7 - Oct. 4 EPU +/- 5 mins.*, NHATS target
Approaching Traffic
6.7   LD Sept. 30* 2019 SP 44 m  30.4 from 33.7 LD Sept. 28 - Oct. 3 EPU +/- 2.32 hours*
* EPU = Earth passage uncertainty

This report was generated at 1755 UTC with four discoveries: From yesterday passing risk-listed 2019 SX (MPEC, DOU). And from today inbound 2019 SG1 (MPEC), passing intruder 2019 SD1 (MPEC), and departed risk-listed 2019 SF1 (MPEC, DOU), which went by us at approximately 2.1 LD on September 10th (uncertainty +/- 8.25 hours). Today's DOU MPEC has follow-up for outbound 2019 ST and departed risk-listed 2019 SD.



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 21 September '19

The MPC's NEO Confirmation Page has 53 listings

When last checked at 1935 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 53 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 65 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 21 September '19

Minor Planet Electronic Circulars

As of last check at 1935 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 21 September '19 >>  MPEC 2019-S38 - "12:11 UT" - Daily Orbit Update


MPEC 2019-S37 - "05:43 UT" - 2019 SG1


MPEC 2019-S36 - "05:40 UT" - 2019 SF1


MPEC 2019-S35 - "05:38 UT" - 2019 SE1


MPEC 2019-S34 - "05:36 UT" - 2019 SD1


MPEC 2019-S33 - "05:27 UT" - 2019 SC1


MPEC 2019-S32 - "05:24 UT" - 2019 SB1


MPEC 2019-S31 - "05:21 UT" - 2019 SA1


MPEC 2019-S30 - "05:17 UT" - 2019 SZ

Observers  on 21 September '19

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 1 in MPEC 2019-S30 -- 2019 SZ
R57Aorangi Iti Obs., 3 in MPEC 2019-S38 -- 2019 RD, 2019 QV, 2006 SE6
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2019-S30, 2019-S31, 2019-S32, 2019-S33, 2019-S35, 2019-S36 & 2019-S37 -- 2019 SZ, 2019 SG1, 2019 SF1, 2019 SE1, 2019 SC1, 2019 SB1, 2019 SA1
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2019-S30 -- 2019 SZ
703Catalina Sky Survey in Arizona, 1 in MPEC 2019-S30 -- 2019 SZ
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPEC 2019-S38 -- 2019 RU2, 2019 RF, 2019 RC2, 2019 QT4, 2019 PZ, 2019 PK2, 2019 NW4, 2019 NJ5, 2019 NF2
Z99Clixby Obs. in England, 2 in MPECs 2019-S30 & 2019-S36 -- 2019 SZ, 2019 SF1
K87Dettelbach Vineyard Obs. in Germany, 9 in MPEC 2019-S38 -- 2019 SZ, 2019 SW, 2019 SV, 2019 SH, 2019 SF1, 2019 PR2, 2019 LE5, 2014 XX7, 2007 TQ24
W46Foxfire Village Obs., 4 in MPEC 2019-S38 -- 2015 RZ35, 2013 CK89, 237805, 1620
E89Geyserland Obs. in New Zealand, 6 in MPEC 2019-S38 -- 89355, 66146, 42286, 140333, 136993, 3122
J95Great Shefford Obs. in England, 7 in MPECs 2019-S30, 2019-S33, 2019-S34, 2019-S35 & 2019-S38 -- 2019 SZ, 2019 SX, 2019 SW, 2019 ST, 2019 SE1, 2019 SD1, 2019 SC1
A17Guidestar Obs. in Germany, 6 in MPECs 2019-S30, 2019-S36 & 2019-S38 -- 2019 SZ, 2019 SF1, 2013 CK89, 2010 UH7, 2009 QB36, 2007 TQ24
246KLENOT in the Czech Republic, 5 in MPECs 2019-S34 & 2019-S38 -- 2019 SH, 2019 SD1, 2019 SD, 2019 QY3, 2019 QC1
V01Mountainville Obs. in Utah, 1 in MPEC 2019-S38 -- 2019 SH
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2019-S31, 2019-S32, 2019-S33, 2019-S34, 2019-S35, 2019-S36 & 2019-S37 -- 2019 SG1, 2019 SF1, 2019 SE1, 2019 SD1, 2019 SC1, 2019 SB1, 2019 SA1
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2019-S38 -- 2015 RZ35
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2019-S31 & 2019-S33 -- 2019 SC1, 2019 SA1
104San Marcello Pistoiese Obs. in Italy, 7 in MPECs 2019-S30, 2019-S33, 2019-S34, 2019-S35, 2019-S36, 2019-S37 & 2019-S38 -- 2019 SZ, 2019 SW, 2019 SG1, 2019 SF1, 2019 SE1, 2019 SD1, 2019 SC1
H36Sandlot Obs. in Kansas, 1 in MPEC 2019-S30 -- 2019 SZ
C95SATINO-1 in France, 2 in MPECs 2019-S34 & 2019-S38 -- 2019 SD1, 2019 PE2
G40'W.F. Cashwell in Nevada via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-S38 -- 326742
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2019-S30 & 2019-S38 -- 2019 SZ, 2019 RY, 2019 OQ2, 2019 NC1, 2015 OL35, 2010 TX168
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2019-S30 & 2019-S38 -- 2019 SZ, 2019 RV3, 2019 RQ1, 2015 RP82, 2015 RH2, 2014 AF51, 2010 AG79
W34Squirrel Valley Obs. in North Carolina, 2 in MPECs 2019-S33 & 2019-S38 -- 2019 SC1, 2014 XX7
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2019-S30 -- 2019 SZ
I52Steward Obs. Mt. Lemmon Station in Arizona, 10 in MPECs 2019-S31, 2019-S32, 2019-S33, 2019-S35, 2019-S37 & 2019-S38 -- 2019 SH, 2019 SG1, 2019 SE1, 2019 SC1, 2019 SB1, 2019 SA1, 2019 QX, 2019 QM5, 2019 MK2, 2019 GP2
A16Tentlingen Obs. in Switzerland, 4 in MPEC 2019-S38 -- 504800, 26166, 108906, 2059
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2019-S38 -- 2017 YZ1
L01Visnjan Obs., 8 in MPECs 2019-S30, 2019-S31, 2019-S32, 2019-S33, 2019-S34, 2019-S35, 2019-S36 & 2019-S37 -- 2019 SZ, 2019 SG1, 2019 SF1, 2019 SE1, 2019 SD1, 2019 SC1, 2019 SB1, 2019 SA1
C51WISE in Earth polar orbit, 2 in MPEC 2019-S38 -- 2014 QK433, 264993
I41Zwicky Transient Facility (ZTF) in southern California, 5 in MPEC 2019-S38 -- 2010 UH7, 2006 KE, 489486, 311044, 243025
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 1935 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 SG1JPL Sentry16152064-206411.663e-06-6.91-6.910JPL: Computed at 23:59 Sept. 20th Pacific time based on 22 observations spanning .91614 days (2019-Sep-20.28714 to 2019-Sep-21.20328). Diameter approximately 0.009 km. from weighted mean H=27.77.
NEODyS16152064-208541.58e-06-6.95-6.960NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2019-09-20.288 to 2019-09-21.204."
2019 SF1JPL Sentry16152090-211981.79077e-08-8.71-9.080JPL: Computed at 06:42 today Pacific time based on 27 observations spanning .85457 days (2019-Sep-20.36503 to 2019-Sep-21.2196). Diameter approximately 0.019 km. from weighted mean H=26.25.
2019 SXJPL Sentry16152048-2116580.0004943802981-5.45-5.660JPL #2 for the day: Computed at 06:43 today Pacific time based on 14 observations spanning .71295 days (2019-Sep-20.25675 to 2019-Sep-20.969702). Diameter approximately 0.004 km. from weighted mean H=29.54.
NEODyS16152046-2118974.36e-04-5.53-5.740NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2019-09-20.258 to 2019-09-20.971."
2019 SDJPL Sentry16152080-211030.00017736742-4.11-4.110JPL: Computed at 06:33 today Pacific time based on 93 observations spanning 3.5796 days (2019-Sep-17.240317 to 2019-Sep-20.81992). Diameter approximately 0.028 km. from weighted mean H=25.43.
NEODyS16152080-211033.72e-05-4.80-4.80NEODyS: "Based on 93 optical observations (of which 1 are rejected as outliers) from 2019-09-17.241 to 2019-09-20.821."
2019 RV3JPL Sentry16152115-211512.811e-08-5.25-5.250JPL: Computed at 06:32 today Pacific time based on 25 observations spanning 14.834 days (2019-Sep-06.6042 to 2019-Sep-21.43847). Diameter approximately 0.390 km. from weighted mean H=19.72.
NEODyS16152076-211596.68e-08-4.88-5.260NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2019-09-06.605 to 2019-09-21.439."
2019 RQ1NEODyS1615R E M O V E D-

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 21 September '19

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

1755Generated Traffic Report
1615Noted that NEODyS has removed 2019 RQ1 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 RV3 risk assessment - see above
Noted that NEODyS has updated its 2019 RV3 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 posted 2019 SF1 as an impact risk - see above
Noted that JPL Sentry has posted 2019 SG1 as an impact risk - see above
Noted that NEODyS has posted 2019 SG1 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 SX risk assessment - see above
Noted that NEODyS has posted 2019 SX as an impact risk - see above
Grabbed MPEC 2019-S38 - Daily Orbit Update - see above
0616Grabbed MPEC 2019-S30 - 2019 SZ - see above
Grabbed MPEC 2019-S31 - 2019 SA1 - see above
Grabbed MPEC 2019-S32 - 2019 SB1 - see above
Grabbed MPEC 2019-S33 - 2019 SC1 - see above
Grabbed MPEC 2019-S34 - 2019 SD1 - see above
Grabbed MPEC 2019-S35 - 2019 SE1 - see above
Grabbed MPEC 2019-S36 - 2019 SF1 - see above
Grabbed MPEC 2019-S37 - 2019 SG1 - see above
0045Noted that JPL Sentry has posted 2019 SX as an impact risk - see above