Contents  on 20 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 20 September '19

Seven objects reported inside ten LD

Bulletin - 0046 UTC 21 Sept.:  One new discovery of a close passer has been announced.

Earth passageI D~Size~Inside ten LDNotes
1.10 LD at 1645 UTC today2019 SX4 m Sept. 18 - 25risk, MPEC


Seven transient natural objects are reported traveling within ten lunar distances (LD) of our planet today. Nearest is risk-listed 2019 SC, which moves out from 1.56 to 3.96 LD from Earth and began the day less than one LD from the Moon.

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  6.19 to 8.10 LD Sept. 11 - 21 NEW,intruder, risk - MPEC, DOU
1.40 LD yesterday 2019 SC 12 m  1.56 to 3.96 LD Sept. 16 - 23 Moon buzzer, exits Earth SOI, risk - DOU
4.22 LD Sept. 26 2017 KP27 23 m  7.42 from 8.31 LD Sept. 18 - Oct. 5 NHATS target
5.50 LD today 2019 ST 43 m  5.50 LD Sept. 17 - 23 NEW, Earth closest at 1719 UTC - MPEC
5.81 LD Sept. 16 2019 SD 28 m  9.95 to 11.88 LD Sept. 12 - 20 exits ten LD, risk - DOU
7.89 LD tomorrow 2017 SL16 23 m  7.89 from 8.04 LD Sept. 16 - 25 NHATS target
8.5   LD today* 2019 RP2 5 m  8.5 LD Sept. 7 - Oct. 4 EPU +/- 5 mins.*, Earth closest at 1216 UTC - DOU
Approaching Traffic
6.7   LD Sept. 30* 2019 SP 44 m  33.7 from 37.0 LD Sept. 28 - Oct. 3 NEW, EPU +/- 2.32 hours* - MPEC
* EPU = Earth passage uncertainty

This report was generated at 2308 UTC with four discoveries: From yesterday, outbound risk-listed intruder 2019 SJ (MPEC, DOU), which passed the Earth at 0.64 LD on September 16 and the Moon the next day at 0.26 LD. And, from today, approaching 2019 SP (MPEC), passing 2019 ST (MPEC), and departed 2019 SQ (MPEC, DOU), which went by us at roughly 5.4 LD* on September 7th (uncertainty +/- 4.7833 hours). Today's DOU MPEC has follow-up for passing 2019 RP2, outbound risk-listed objects 2019 SD and 2019 SC, and distant risk-listed 2018 YQ2.



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 come within ten LD since A/CC began this traffic reporting (2007) but is not now so close. Object temporal distances are derived by A/CC from JPL Horizons data. "LD*" indicates some uncertainty in an object's Earth passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 20 September '19

The MPC's NEO Confirmation Page has 60 listings

When last checked at 2220 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 60 objects listed. Of these, 36 were "one nighters." The Tracking News counted a total of 77 listings on the NEOCP on this day.

New MPECs  on 20 September '19

Minor Planet Electronic Circulars

There were thirteen MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2019-S29 - "21:22 UT" - 2019 SX


MPEC 2019-S28 - "19:37 UT" - 2019 SW


MPEC 2019-S27 - "14:23 UT" - 2019 SV


<< DOU on 20 September '19 >>  MPEC 2019-S26 - "12:11 UT" - Daily Orbit Update


MPEC 2019-S25 - "10:33 UT" - Comet C/2019 Q4 (Borisov)


MPEC 2019-S24 - "10:16 UT" - 2019 SU


MPEC 2019-S23 - "10:13 UT" - 2019 ST


MPEC 2019-S22 - "07:27 UT" - 2019 SQ


MPEC 2019-S21 - "07:23 UT" - 2019 SP


MPEC 2019-S20 - "07:14 UT" - 2019 SO


MPEC 2019-S19 - "07:04 UT" - 2019 SN


MPEC 2019-S18 - "07:00 UT" - 2019 SM


MPEC 2019-S17 - "06:55 UT" - 2019 SL

Observers  on 20 September '19

A total of 53 observers appeared in this day's MPECs.

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 3 in MPECs 2019-S23, 2019-S27 & 2019-S28 -- 2019 SW, 2019 SV, 2019 ST
H21Astronomical Research Obs. Westfield in Illinois, 23 in MPECs 2019-S17, 2019-S18, 2019-S21, 2019-S22, 2019-S23, 2019-S26, 2019-S27 & 2019-S28 -- 2019 SW, 2019 SV, 2019 ST, 2019 SQ, 2019 SP, 2019 SM, 2019 SL, 2019 RY3, 2019 RH2, 2019 RC, 2019 PP1, 2019 PC3, 2019 MX3, 2019 MK2, 2019 JE6, 2019 GT3, 2017 YF5, 2016 BD39, 85709, 237805, 18172, 2100, 2059
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2019-S26 -- 2019 NJ5, 2019 MV3, 2019 MK2, 2019 LK5, 2019 KC4, 2019 GD3, 141593
T08ATLAS Mauna Loa in Hawaii, 9 in MPECs 2019-S26 & 2019-S28 -- 2019 SW, 2019 NJ5, 2019 MV3, 2019 MK2, 2019 LE5, 2019 KC4, 2014 QQ266, 2010 VW75, 354030
Z84Calar Alto Schmidt in Spain, 2 in MPECs 2019-S19 & 2019-S25 -- 2019 SN, C/2019 Q4
160Castelmartini Obs. in Italy, 9 in MPECs 2019-S23 & 2019-S26 -- 2019 ST, 2019 GT3, 503960, 424089, 355256, 340666, 105140, 2059, 1865
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2019-S23 & 2019-S26 -- 2019 ST, 2019 NJ5, 2019 MV3, 2019 MK2, 2019 KC4, 2019 GT3, 2006 SE6, 354030
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 34 in MPECs 2019-S17, 2019-S20, 2019-S22 & 2019-S26 -- 2019 SQ, 2019 SO, 2019 SL, 2019 RV1, 2019 RU2, 2019 RD, 2019 RC2, 2019 QV, 2019 QU2, 2019 QT4, 2019 QT2, 2019 QT, 2019 QL4, 2019 QJ1, 2019 QF2, 2019 QC4, 2019 QC1, 2019 PZ2, 2019 PD3, 2019 OZ, 2019 OV2, 2019 OQ2, 2019 OJ1, 2019 OH1, 2019 NJ5, 2019 NF2, 2019 MG3, 2019 ME2, 2019 LX4, 2019 KH2, 2019 KC4, 2019 JW2, 2019 HT3, 2019 FV2
G58Chabot Obs. in northern California, 1 in MPEC 2019-S28 -- 2019 SW
Z99Clixby Obs. in England, 1 in MPEC 2019-S23 -- 2019 ST
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2019-S25 -- C/2019 Q4
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2019-S25 -- C/2019 Q4
958Dax Obs. in France, 1 in MPEC 2019-S23 -- 2019 ST
595Farra d'Isonzo Obs. in Italy, 4 in MPECs 2019-S21, 2019-S23, 2019-S27 & 2019-S28 -- 2019 SW, 2019 SV, 2019 ST, 2019 SP
I88Fuensanta de Martos Obs. in Spain, 1 in MPEC 2019-S25 -- C/2019 Q4
E89Geyserland Obs. in New Zealand, 2 in MPEC 2019-S26 -- 66146, 4953
K88GINOP-KHK in Hungary, 3 in MPECs 2019-S23, 2019-S27 & 2019-S28 -- 2019 SW, 2019 SV, 2019 ST
Z182program code 2 via Gran Telescopio in the Canary Islands, 1 in MPEC 2019-S25 -- C/2019 Q4
J95Great Shefford Obs. in England, 11 in MPECs 2019-S17, 2019-S19, 2019-S21, 2019-S23, 2019-S24, 2019-S25, 2019-S26, 2019-S27, 2019-S28 & 2019-S29 -- 2019 SX, 2019 SW, 2019 SV, 2019 SU, 2019 ST, 2019 SP, 2019 SN, 2019 SL, 2019 SD, 2019 SC, C/2019 Q4
A17Guidestar Obs. in Germany, 3 in MPECs 2019-S23, 2019-S27 & 2019-S28 -- 2019 SW, 2019 SV, 2019 ST
W14Harvest Obs., 1 in MPEC 2019-S26 -- 2019 GT3
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2019-S25 -- C/2019 Q4
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2019-S26 -- 2010 JM151
246KLENOT in the Czech Republic, 1 in MPEC 2019-S28 -- 2019 SW
Z43Landehen Obs., 2 in MPEC 2019-S26 -- 2019 GT3, 326777
C10Maisoncelles Obs. in France, 1 in MPEC 2019-S25 -- C/2019 Q4
W92MASTER OAFA Obs., 1 in MPEC 2019-S26 -- 9400
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2019-S26 -- 2019 MK2, 2019 KC4, 2015 PC228
C653program code 3 via Montsec Obs. in Spain, 1 in MPEC 2019-S25 -- C/2019 Q4
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2019-S19, 2019-S22, 2019-S24, 2019-S27, 2019-S28 & 2019-S29 -- 2019 SX, 2019 SW, 2019 SV, 2019 SU, 2019 SQ, 2019 SN
K74Muensterschwarzach Obs. in Germany, 2 in MPECs 2019-S23 & 2019-S26 -- 2019 ST, 2013 CK89
C53NEOSSat in Earth orbit, 1 in MPEC 2019-S25 -- C/2019 Q4
J69North Obs. in England, 1 in MPEC 2019-S23 -- 2019 ST
Z80Northolt Branch Obs. in England, 4 in MPECs 2019-S23, 2019-S26 & 2019-S28 -- 2019 SW, 2019 ST, 2019 SC, 2009 QB36
G34Oberfrauendorf Obs. in Germany, 2 in MPECs 2019-S23 & 2019-S26 -- 2019 ST, 2014 QQ266
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2019-S17, 2019-S20, 2019-S21, 2019-S22, 2019-S23, 2019-S25 & 2019-S26 -- 2019 ST, 2019 SQ, 2019 SP, 2019 SO, 2019 SL, C/2019 Q4, 2019 JY4
K63Pascoli Obs. in Italy, 1 in MPEC 2019-S28 -- 2019 SW
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2019-S25 -- C/2019 Q4
C95SATINO-1 in France, 2 in MPECs 2019-S25 & 2019-S26 -- C/2019 Q4, 2019 PP1
G40'W.F. Cashwell in Nevada via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-S26 -- 326742
G409B. Lutkenhoner in Germany via Slooh.com Canary Islands Obs. in the Canary Islands, 1 in MPEC 2019-S25 -- C/2019 Q4
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2019-S17, 2019-S21 & 2019-S26 -- 2019 SQ, 2019 SP, 2019 SL, 2019 SD, 2019 GT3, 2015 OL35, 2010 TX168
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2019-S26 -- 2019 SJ, 2019 RV3, 2019 RQ1, 2019 RP2, 2019 RO2, 2019 QV7
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2019-S27 -- 2019 SV
Z86St. Mellons Obs. in Wales, 1 in MPEC 2019-S26 -- 2019 GT3
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2019-S23, 2019-S27 & 2019-S28 -- 2019 SW, 2019 SV, 2019 ST
I52Steward Obs. Mt. Lemmon Station in Arizona, 21 in MPECs 2019-S19, 2019-S23, 2019-S24, 2019-S26, 2019-S27, 2019-S28 & 2019-S29 -- 2019 SX, 2019 SW, 2019 SV, 2019 SU, 2019 ST, 2019 SN, 2019 RV1, 2019 RU1, 2019 RL3, 2019 RE2, 2019 QS1, 2019 QL, 2019 QK4, 2019 QF2, 2019 PH, 2019 PE2, 2019 OX2, 2019 NJ6, 2019 KF3, 2019 KC4, 2015 JD1
A71Stixendorf Obs. in Austria, 1 in MPEC 2019-S25 -- C/2019 Q4
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2019-S26 -- 2018 YQ2, 2018 PL23
L01Visnjan Obs., 9 in MPECs 2019-S18, 2019-S19, 2019-S21, 2019-S23, 2019-S24, 2019-S26, 2019-S27 & 2019-S28 -- 2019 SW, 2019 SV, 2019 SU, 2019 ST, 2019 SP, 2019 SN, 2019 SM, 2019 SJ, 2019 SH
718Wiggins Obs. in Utah, 1 in MPEC 2019-S23 -- 2019 ST
C51WISE in Earth polar orbit, 2 in MPEC 2019-S26 -- 455432, 159454
I15Wishing Star Obs. in Rhode Island, 5 in MPEC 2019-S26 -- 2009 QB36, 2001 QC34, 503960, 340666, 2059
I41Zwicky Transient Facility (ZTF) in southern California, 9 in MPECs 2019-S18 & 2019-S26 -- 2019 SM, 2019 PA, 2019 OP2, 2014 HH192, 2010 UH7, 2006 MA, 367525, 243025, 162082
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 September '19

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2220 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 SJJPL Sentry18352055-2119410.000194620345-5.21-5.760JPL: Computed at 07:02 today Pacific time based on 30 observations spanning 2.0826 days (2019-Sep-18.358702 to 2019-Sep-20.44131). Diameter approximately 0.011 km. from weighted mean H=27.46.
NEODyS18352055-2118711.49e-04-5.33-5.910NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2019-09-18.360 to 2019-09-20.442."
2019 SDJPL Sentry18352080-211030.00017316565-4.12-4.120JPL: Computed at 06:53 today Pacific time based on 87 observations spanning 3.1153 days (2019-Sep-17.240317 to 2019-Sep-20.35565). Diameter approximately 0.028 km. from weighted mean H=25.43.
NEODyS18352080-211043.39e-05-4.84-4.840NEODyS: "Based on 87 optical observations (of which 1 are rejected as outliers) from 2019-09-17.241 to 2019-09-20.356."
2019 SCJPL Sentry18352051-205116.305e-06-5.99-5.990JPL: Computed at 06:52 today Pacific time based on 68 observations spanning 13.708 days (2019-Sep-06.411436 to 2019-Sep-20.119139). Diameter approximately 0.012 km. from weighted mean H=27.22.
NEODyS1835205115.84e-06-6.05-6.050NEODyS: "Based on 69 optical observations (of which 1 are rejected as outliers) from 2019-09-06.412 to 2019-09-20.120."
2019 RV3JPL Sentry18352093-211563.05137e-08-5.22-5.510JPL: Computed at 06:31 today Pacific time based on 22 observations spanning 13.808 days (2019-Sep-06.6042 to 2019-Sep-20.41262). Diameter approximately 0.386 km. from weighted mean H=19.73.
NEODyS18352069-2115121.25e-07-4.58-5.070NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2019-09-06.605 to 2019-09-20.413."
2019 RT3NEODyS18352075-2118421.44e-04-4.11-4.180NEODyS: "Based on 84 optical observations (of which 0 are rejected as outliers) from 2019-09-11.605 to 2019-09-19.344."
2019 RO2NEODyS1835R E M O V E D-
2019 RQ1NEODyS1835207714.78e-10-8.67-8.670NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2019-09-05.402 to 2019-09-20.193."
2019 QV7NEODyS1835R E M O V E D-
2018 YQ2NEODyS1835R E M O V E D-
2017 AB21NEODyS18352021-2116608.56e-09-5.84-6.40NEODyS: "Based on 7 optical observations (of which 0 are rejected as outliers) from 2017-01-03.471 to 2017-01-04.445."

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 20 September '19

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

2308Generated Traffic Report
2150Grabbed MPEC 2019-S28 - 2019 SW - see above
Grabbed MPEC 2019-S29 - 2019 SX - see above
1835Noted that NEODyS has updated its 2017 AB21 risk assessment - see above
Noted that NEODyS has removed 2018 YQ2 as an impact risk - see above
Noted that NEODyS has removed 2019 QV7 as an impact risk - see above
Noted that NEODyS has removed 2019 RO2 as an impact risk - see above
Noted that NEODyS has updated its 2019 RQ1 risk assessment - see above
Noted that NEODyS has updated its 2019 RT3 risk assessment - 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 SC risk assessment - see above
Noted that NEODyS has posted 2019 SC as an impact risk - see above
Noted that JPL Sentry has updated its 2019 SD risk assessment - see above
Noted that NEODyS has posted 2019 SD as an impact risk - see above
Noted that JPL Sentry has updated its 2019 SJ risk assessment - see above
Noted that NEODyS has posted 2019 SJ as an impact risk - see above
Grabbed MPEC 2019-S27 - 2019 SV - see above
1230Grabbed MPEC 2019-S17 - 2019 SL - see above
Grabbed MPEC 2019-S18 - 2019 SM - see above
Grabbed MPEC 2019-S19 - 2019 SN - see above
Grabbed MPEC 2019-S20 - 2019 SO - see above
Grabbed MPEC 2019-S21 - 2019 SP - see above
Grabbed MPEC 2019-S22 - 2019 SQ - see above
Grabbed MPEC 2019-S23 - 2019 ST - see above
Grabbed MPEC 2019-S24 - 2019 SU - see above
Grabbed MPEC 2019-S25 - Comet C/2019 Q4 (Borisov) - see above
Grabbed MPEC 2019-S26 - Daily Orbit Update - see above