Contents  on 19 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 19 September '19

Five objects reported inside ten LD

Bulletin - 2234 UTC:  One new discovery of a close passer has been announced.

Earth passageI D~Size~Inside ten LDNotes
0.64 LD at 1855 UTC Sept. 162019 SJ11 m Sept. 11 - 22intruder - MPEC


There are five asteroids reported within ten lunar distances (LD) of Earth today. The nearest of these is risk-listed 2019 SC, which comes in from 2.73 to 1.40 LD and then moves out 1.56 LD. It gets even closer to the Moon, reaching 0.40 LD from that body.

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
1.40 LD today 2019 SC 11 m  1.40 LD Sept. 16 - 23 Moon buzzer, Moon closest 0.40 LD at 1817 UTC,
Earth closest at 1836 UTC, risk - DOU
4.22 LD Sept. 26 2017 KP27 23 m  8.31 from 9.23 LD yesterday - Oct. 5 NHATS target - DOU
5.81 LD Sept. 16 2019 SD 28 m  8.20 to 9.94 LD Sept. 12 - 20 NEW, risk - MPEC
7.89 LD Sept. 21 2017 SL16 23 m  8.04 from 8.45 LD Sept. 16 - 25 NHATS target
8.5   LD tomorrow* 2019 RP2 5 m  8.5 from 8.5 LD Sept. 7 - Oct. 4 *Earth passage uncertainty +/- 20 mins. - DOU

This report was generated at 2035 UTC with the discoveries of outbound risk-listed 2019 SD (MPEC) and of already departed 2019 SF (MPEC), which flew by us at about 6.9 LD on September 11th (uncertainty +/- 2.12 hours). Today's DOU MPEC has follow-up for inbound objects 2019 RP2 and 2017 KP27, passing risk-listed 2019 SC, and departed objects 2019 RW1 and risk-listed 2019 RT3.



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 19 September '19

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 53 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 19 September '19

Minor Planet Electronic Circulars

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


MPEC 2019-S16 - "21:43 UT" - 2019 SJ


MPEC 2019-S15 - "21:37 UT" - 2019 SH


MPEC 2019-S14 - "16:39 UT" - 2019 SF


<< DOU on 19 September '19 >>  MPEC 2019-S13 - "12:10 UT" - Daily Orbit Update


MPEC 2019-S12 - "06:39 UT" - 2019 SD

Observers  on 19 September '19

A total of 43 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 8 in MPEC 2019-S13 -- 2019 GT3, 2015 RZ35, 85709, 503960, 355256, 326777, 2100, 2059
A44Altschwendt Obs. in Austria, 3 in MPECs 2019-S12, 2019-S13 & 2019-S15 -- 2019 SH, 2019 SD, 2019 SC
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2019-S13 & 2019-S15 -- 2019 SH, 2019 QU1, 2019 PC3, 2019 NK5, 2019 JX6
T05ATLAS Haleakala in Hawaii, 64 in MPEC 2019-S13 -- 2019 LW1, 2016 PX66, 2016 NL15, 2015 RZ35, 2014 PF68, 2013 CK89, 2010 VW75, 2010 UH7, 2009 DH39, 2008 YR27, 2006 QS23, 2001 QC34, 85709, 530743, 524603, 523605, 516154, 503960, 492143, 467475, 455432, 450160, 442243, 441058, 434786, 424089, 411201, 405212, 401857, 380160, 36236, 354030, 326777, 326742, 318411, 25330, 247517, 243025, 228502, 223456, 20826, 18172, 162082, 153842, 152942, 152754, 141593, 137170, 112221, 108906, 105140, 6047, 5786, 5626, 5143, 5131, 4183, 3753, 3102, 2100, 2059, 1866, 1620, 433
T08ATLAS Mauna Loa in Hawaii, 62 in MPEC 2019-S13 -- 2019 SC, 2019 LW1, 2016 PX66, 2016 NL15, 2015 VL142, 2015 HB10, 2013 CK89, 2010 VW75, 2010 UH7, 90403, 85839, 85709, 524603, 503960, 467475, 455432, 442243, 424089, 410778, 405212, 401857, 380160, 36236, 355256, 35107, 340666, 326777, 326742, 248926, 247517, 243025, 237805, 228502, 18172, 163760, 162273, 162082, 153842, 152942, 143947, 143527, 141593, 140333, 137170, 108906, 105140, 10145, 9202, 7088, 6455, 5626, 5189, 5131, 4183, 3753, 3200, 3103, 3102, 2100, 2059, 1943, 1865
B88Bigmuskie Obs. in Italy, 2 in MPEC 2019-S13 -- 2019 GT3, 237805
Z84Calar Alto Schmidt in Spain, 1 in MPEC 2019-S15 -- 2019 SH
160Castelmartini Obs. in Italy, 5 in MPEC 2019-S13 -- 442243, 143527, 141593, 6455, 3102
703Catalina Sky Survey (CSS) in Arizona, 28 in MPECs 2019-S12 & 2019-S13 -- 2019 SD, 2014 NU64, 2013 CK89, 2008 YR27, 2006 DY, 2001 QC34, 89830, 524603, 523605, 503960, 492143, 489486, 424089, 411201, 410778, 405212, 401857, 326777, 26166, 25330, 247517, 163760, 153814, 10145, 5189, 3753, 2100, 2059
Z99Clixby Obs. in England, 1 in MPEC 2019-S15 -- 2019 SH
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2019-S15 -- 2019 SH
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2019-S15 -- 2019 SH
X31Galilei Obs., 1 in MPEC 2019-S12 -- 2019 SD
203GiaGa Obs. in Italy, 1 in MPEC 2019-S15 -- 2019 SH
K88GINOP-KHK in Hungary, 3 in MPECs 2019-S12, 2019-S15 & 2019-S16 -- 2019 SJ, 2019 SH, 2019 SD
J95Great Shefford Obs. in England, 4 in MPECs 2019-S12, 2019-S13, 2019-S15 & 2019-S16 -- 2019 SJ, 2019 SH, 2019 SD, 2019 SC
238Grorudalen Obs. in Norway, 1 in MPEC 2019-S13 -- 99248
A17Guidestar Obs. in Germany, 4 in MPECs 2019-S12, 2019-S13 & 2019-S15 -- 2019 SH, 2019 SD, 2015 HB10, 524603
585Kiev Comet Station in Ukraine, 1 in MPEC 2019-S12 -- 2019 SD
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 7 in MPEC 2019-S13 -- 2019 RW, 2019 RH2, 2019 QV7, 2019 QJ4, 2019 PY, 2019 NZ1, 2019 AK13
Z43Landehen Obs., 1 in MPEC 2019-S12 -- 2019 SD
W92MASTER OAFA Obs., 1 in MPEC 2019-S13 -- 9400
K95MASTER-II Sutherland in South Africa, 2 in MPEC 2019-S13 -- 9400, 7482
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2019-S13, 2019-S14, 2019-S15 & 2019-S16 -- 2019 SJ, 2019 SH, 2019 SF, 2017 VB, 477524, 389694, 243025, 18882
K74Muensterschwarzach Obs. in Germany, 2 in MPEC 2019-S13 -- 2019 GT3, 237805
J69North Obs. in England, 3 in MPECs 2019-S12, 2019-S13 & 2019-S15 -- 2019 SH, 2019 SD, 2019 SC
Z80Northolt Branch Obs. in England, 3 in MPECs 2019-S12, 2019-S13 & 2019-S15 -- 2019 SH, 2019 SD, 2100
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2019-S12 -- 2019 SD
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2019-S12, 2019-S13 & 2019-S16 -- 2019 SJ, 2019 SD, 2015 OL35, 2009 DR36, 1998 QQ, 65733, 53110, 411201, 331471, 310737, 178871, 108906, 5131, 2059
F52Pan-STARRS 2 (PS2) in Hawaii, 5 in MPEC 2019-S13 -- 2019 JC47, 2012 HR69, 378610, 26166, 6047
K63Pascoli Obs. in Italy, 2 in MPECs 2019-S15 & 2019-S16 -- 2019 SJ, 2019 SH
K61Rokycany Obs. in the Czech Republic, 3 in MPECs 2019-S12, 2019-S13 & 2019-S15 -- 2019 SH, 2019 SD, 2019 PR2
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2019-S15 -- 2019 SH
H36Sandlot Obs. in Kansas, 2 in MPECs 2019-S12 & 2019-S15 -- 2019 SH, 2019 SD
C95SATINO-1 in France, 2 in MPECs 2019-S12 & 2019-S15 -- 2019 SH, 2019 SD
691Spacewatch 0.9m telescope in Arizona, 18 in MPEC 2019-S13 -- 2019 RY, 2019 RK, 2019 QY3, 2019 OQ2, 2019 NC1, 2019 LX4, 2017 KP27, 2016 UD101, 2015 RH2, 2015 OL35, 2010 AG79, 2009 SP, 2006 RJ1, 85490, 494880, 459200, 26166, 7092
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2019-S13 -- 2019 RW1, 2019 RT3, 2019 RQ1, 2019 RP2, 2019 RO2, 2019 QK7, 2015 RA36
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2019-S15 -- 2019 SH
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2019-S12 & 2019-S15 -- 2019 SH, 2019 SD
I52Steward Obs. Mt. Lemmon Station in Arizona, 17 in MPECs 2019-S12, 2019-S13, 2019-S14 & 2019-S15 -- 2019 SH, 2019 SF, 2019 SD, 2019 RY1, 2019 RX, 2019 RV, 2019 RG, 2019 RE2, 2019 QT4, 2019 QM5, 2019 QL4, 2019 PW1, 2019 PD2, 2019 OA5, 2019 KB4, 152942, 152754
L01Visnjan Obs., 3 in MPECs 2019-S12, 2019-S13 & 2019-S15 -- 2019 SH, 2019 SD, 2019 SC
I15Wishing Star Obs. in Rhode Island, 6 in MPEC 2019-S13 -- 2015 PC228, 503960, 492143, 326742, 105140, 2059
I41Zwicky Transient Facility (ZTF) in southern California, 4 in MPEC 2019-S13 -- 2019 PA, 2012 PW, 2006 MA, 367525
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 SJJPL Sentry23582055-2119440.000597844086-4.68-5.070JPL: Computed at 16:09 today Pacific time based on 24 observations spanning 1.4933 days (2019-Sep-18.358702 to 2019-Sep-19.852019). Diameter approximately 0.011 km. from weighted mean H=27.44.
2019 SDJPL Sentry16002080-211030.000142748-4.20-4.200JPL: Computed at 01:00 today Pacific time based on 77 observations spanning 1.8702 days (2019-Sep-17.240317 to 2019-Sep-19.11056). Diameter approximately 0.028 km. from weighted mean H=25.42.
2019 SCJPL Sentry16002051-205116.003e-06-6.09-6.090JPL: Computed at 06:32 today Pacific time based on 47 observations spanning 12.667 days (2019-Sep-06.411436 to 2019-Sep-19.078145). Diameter approximately 0.011 km. from weighted mean H=27.38.
2019 RT3JPL Sentry16002075-2115187.6324506e-05-4.38-4.460JPL: Computed at 06:36 today Pacific time based on 84 observations spanning 7.7391 days (2019-Sep-11.603747 to 2019-Sep-19.34286). Diameter approximately 0.032 km. from weighted mean H=25.13.
2019 QS8JPL Sentry16002023-21171034.98105e-06-5.27-5.760JPL: Computed at 01:03 today Pacific time based on 4 observations spanning 1.0347 days (2019-Aug-26.19244 to 2019-Aug-27.22709). Diameter approximately 0.030 km. from weighted mean H=25.26.
2017 VH15NEODyS1600R 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 19 September '19

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

2358Noted that JPL Sentry has posted 2019 SJ as an impact risk - see above
2230Grabbed MPEC 2019-S15 - 2019 SH - see above
Grabbed MPEC 2019-S16 - 2019 SJ - see above
2035Generated Traffic Report
1704Grabbed MPEC 2019-S14 - 2019 SF - see above
1600Noted that NEODyS has removed 2017 VH15 as an impact risk - see above
Noted that JPL Sentry has posted 2019 QS8 as an impact risk - see above
Noted that JPL Sentry has updated its 2019 RT3 risk assessment - see above
Noted that JPL Sentry has updated its 2019 SC risk assessment - see above
Noted that JPL Sentry has posted 2019 SD as an impact risk - see above
Grabbed MPEC 2019-S12 - 2019 SD - see above
Grabbed MPEC 2019-S13 - Daily Orbit Update - see above