Inbound C/2017 K2 (Panstarrs) observed from Hubble to be active beyond the
 distance of Saturn's orbit. Credit: NASA, ESA, & David Jewitt (UCLA)

Incoming Oort Cloud member C/2017 K2 (Panstarrs) has been observed with the Hubble Space Telescope to be already active beyond the distance to Saturn's orbit. A science paper PDF discusses this activity "never seen [before] this far out." Perihelion, further from the Sun than Mars, won't happen until late 2022. Image credit: NASA, ESA, & David Jewitt (UCLA).


Contents  on 30 September '17

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 30 September '17

Nine objects reported inside ten LD

There are nine asteroidal objects reported within ten lunar distances (LD) of our home world today. Closest is newly announced intruder 2017 SX17, which enters Earth's SOI (sphere of gravitational influence), coming in from 3.70 to 2.20 LD. It will pass the Moon at 0.68 LD tomorrow and then go past us at 0.23 LD the next day.

Earth passage I D ~Size Distance Today  Notes
0.23 LD Oct. 22017 SX17 8 m  2.20 from 3.70 LD NEW, intruder, enters Earth SOI - MPEC
1.80 LD Sept. 262017 SF20 7 m  8.23 to 10.56 LD NEW, risk, exits ten LD - MPEC
4.76 LD Sept. 262017 RB16 25 m  9.03 to 10.91 LD exits ten LD
4.96 LD Sept. 252017 RO16 10 m  9.14 to 10.74 LD exits ten LD
5.37 LD Oct. 32017 SS16 16 m  9.77 from 12.98 LD enters ten LD
5.77 LD Sept. 222017 RB15 10 m  9.79 to 10.70 LD exits ten LD
6.01 LD Sept. 252017 SE20 9 m  9.58 to 11.02 LD NEW, exits ten LD - MPEC
7.87 LD yesterday1989 VB 389 m  7.88 to 8.04 LD radar target
9.14 LD today2017 SH16 30 m  9.14 LD Earth closest at 1346 UTC

This report was updated at 2052 UTC with five new discoveries. 2017 SB20 (MPEC) is on approach while two others exit from our ten-LD traffic reporting "bubble": 2017 SE20 (MPEC) and risk-listed 2017 SF20 (MPEC), and the remaining two have already departed. 2017 SD20 (MPEC) flew by Earth at 5.20 LD on September 24th and 2017 SA20 (MPEC) at 1.53 LD on the 19th.
        Your first neighborhood asteroid traffic report was generated at 1710 UTC with the discovery announced late yesterday of inbound intruder 2017 SX17 (MPEC).

Approaching (sorted by 10-LD bubble entry date)
0.13 LD Oct. 122012 TC4 15 m  < 10 LD Oct. 5, intruder, radar/NHATS target, risk
8.94 LD Oct. 112017 SB20 36 m  < 10 LD Oct. 8, NEW - MPEC
8.5   LD Oct. 132005 TE49 15 m  < 10 LD Oct. 11, uncertainty +/- 10.1167 hours, NHATS target
5.77 LD Oct. 22171576 1999 VP11 645 m  < 10 LD Oct. 20



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 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 30 September '17

The MPC's NEO Confirmation Page has 100 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 100 objects listed. Of these, 59 were "one nighters." So far The Tracking News has counted a total of 155 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 30 September '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been 33 MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-S247 - "18:48 UT" - 2017 SK20


MPEC 2017-S246 - "18:44 UT" - 2017 SE20


MPEC 2017-S245 - "18:40 UT" - 2017 SY19


MPEC 2017-S244 - "18:36 UT" - 2017 SJ20


MPEC 2017-S243 - "18:32 UT" - 2017 SP19


MPEC 2017-S242 - "18:29 UT" - 2017 SH20


MPEC 2017-S241 - "18:25 UT" - 2017 SG20


MPEC 2017-S240 - "18:22 UT" - 2017 SF20


MPEC 2017-S239 - "18:18 UT" - 2017 SD20


MPEC 2017-S238 - "18:15 UT" - 2017 SC20


MPEC 2017-S237 - "18:12 UT" - 2017 SB20


MPEC 2017-S236 - "18:08 UT" - 2017 SA20


MPEC 2017-S235 - "18:04 UT" - 2017 SZ19


MPEC 2017-S234 - "18:01 UT" - 2017 SX19


MPEC 2017-S233 - "17:58 UT" - 2017 SW19


MPEC 2017-S232 - "17:54 UT" - 2017 SV19


MPEC 2017-S231 - "17:51 UT" - 2017 SU19


MPEC 2017-S230 - "17:37 UT" - 2017 ST19


MPEC 2017-S229 - "17:33 UT" - 2017 SS19


MPEC 2017-S228 - "17:29 UT" - 2017 SR19


MPEC 2017-S227 - "17:24 UT" - 2017 SQ19


MPEC 2017-S226 - "17:20 UT" - 2017 SO19


MPEC 2017-S225 - "17:18 UT" - 2017 SN19


MPEC 2017-S224 - "17:14 UT" - 2017 SM19


MPEC 2017-S223 - "17:11 UT" - 2017 SL19


MPEC 2017-S222 - "17:08 UT" - 2017 SK19


MPEC 2017-S221 - "17:03 UT" - 2017 SJ19


MPEC 2017-S220 - "17:00 UT" - 2017 SH19


MPEC 2017-S219 - "16:56 UT" - 2017 SG19


MPEC 2017-S218 - "16:52 UT" - 2017 SF19


MPEC 2017-S217 - "16:47 UT" - 2017 SE19


MPEC 2017-S216 - "15:20 UT" - 2013 FW13


<< DOU on 30 Sept. '17 >>  MPEC 2017-S215 - "12:05 UT" - Daily Orbit Update

Observers  on 30 September '17

A total of 33 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 25 in MPECs 2017-S215, 2017-S217, 2017-S220, 2017-S222, 2017-S223, 2017-S224, 2017-S225, 2017-S226, 2017-S227, 2017-S228, 2017-S229, 2017-S230, 2017-S231, 2017-S232, 2017-S233, 2017-S234, 2017-S237, 2017-S238, 2017-S239, 2017-S240, 2017-S241, 2017-S242, 2017-S243, 2017-S244 & 2017-S245 -- 2017 SY19, 2017 SX19, 2017 SW19, 2017 SV19, 2017 SU19, 2017 ST19, 2017 SS19, 2017 SR19, 2017 SQ19, 2017 SP19, 2017 SO19, 2017 SN19, 2017 SM19, 2017 SL19, 2017 SL17, 2017 SK19, 2017 SJ20, 2017 SH20, 2017 SH19, 2017 SG20, 2017 SF20, 2017 SE19, 2017 SD20, 2017 SC20, 2017 SB20
T05ATLAS Haleakala in Hawaii, 1 in MPEC 2017-S229 -- 2017 SS19
T08ATLAS Mauna Loa in Hawaii, 23 in MPECs 2017-S215 & 2017-S242 -- 2017 SH20, 2017 OP68, 2017 MY3, 2015 KN120, 2004 TQ13, 2004 RE84, 90075, 68950, 65679, 55408, 496018, 496005, 333888, 265962, 250458, 220909, 143404, 142040, 11500, 2212, 1980, 1865, 1864
160Castelmartini Obs. in Italy, 2 in MPEC 2017-S215 -- 2017 PJ26, 2017 OP68
703Catalina Sky Survey (CSS) in Arizona, 35 in MPECs 2017-S215, 2017-S229, 2017-S243 & 2017-S247 -- 2017 SS19, 2017 SP19, 2017 SK20, 2017 RR15, 2017 RK1, 2017 RB12, 2017 QL35, 2017 PR25, 2017 OH68, 2017 MY3, 2013 SL30, 2010 SA12, 2004 TD10, 2004 SS, 1989 UP, 85709, 53319, 441825, 416584, 414990, 411201, 408792, 371336, 303250, 192563, 162998, 162679, 162566, 142464, 141670, 138911, 137799, 137199, 8035, 1980
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2017-S218 & 2017-S228 -- 2017 SR19, 2017 SF19
G58Chabot Obs. in northern California, 1 in MPEC 2017-S239 -- 2017 SD20
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-S229 -- 2017 SS19
K88GINOP-KHK in Hungary, 3 in MPECs 2017-S229, 2017-S241 & 2017-S242 -- 2017 SS19, 2017 SH20, 2017 SG20
585Kiev Comet Station in Ukraine, 1 in MPEC 2017-S241 -- 2017 SG20
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 6 in MPECs 2017-S217, 2017-S219, 2017-S220, 2017-S222, 2017-S230 & 2017-S244 -- 2017 ST19, 2017 SK19, 2017 SJ20, 2017 SH19, 2017 SG19, 2017 SE19
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-S229 -- 2017 SS19
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-S215 -- 85709
568_Marco Micheli on Mauna Kea in Hawaii, 5 in MPECs 2017-S217, 2017-S219, 2017-S220, 2017-S223 & 2017-S224 -- 2017 SM19, 2017 SL19, 2017 SH19, 2017 SG19, 2017 SE19
G96Mt. Lemmon Survey (MLS) in Arizona, 37 in MPECs 2017-S215, 2017-S221, 2017-S224, 2017-S229, 2017-S232, 2017-S233, 2017-S234, 2017-S235, 2017-S236, 2017-S237, 2017-S238, 2017-S239, 2017-S240, 2017-S241, 2017-S243, 2017-S245, 2017-S246 & 2017-S247 -- 2017 SZ19, 2017 SY19, 2017 SX19, 2017 SW19, 2017 SV19, 2017 SS19, 2017 SP19, 2017 SM19, 2017 SK20, 2017 SJ19, 2017 SG20, 2017 SG14, 2017 SF20, 2017 SE20, 2017 SE2, 2017 SD20, 2017 SC20, 2017 SB20, 2017 SA20, 2017 RV1, 2017 RO2, 2017 RB12, 2017 QL35, 2014 UA192, 2013 QH48, 1998 SB15, 376788, 376707, 333480, 23548, 190166, 162913, 154007, 137799, 100756, 5786, 5143
0895N.V. Maigurova via Nikolaev Obs. in Ukraine, 6 in MPEC 2017-S215 -- 2017 SN2, 2017 OP68, 2015 KN120, 2014 YC15, 326388, 6053
F51Pan-STARRS 1 (PS1) in Hawaii, 49 in MPECs 2017-S215, 2017-S217, 2017-S218, 2017-S219, 2017-S220, 2017-S221, 2017-S222, 2017-S223, 2017-S224, 2017-S225, 2017-S226, 2017-S227, 2017-S228, 2017-S230, 2017-S231, 2017-S232, 2017-S233, 2017-S235, 2017-S236, 2017-S237, 2017-S238, 2017-S239, 2017-S243, 2017-S244, 2017-S245 & 2017-S246 -- 2017 SZ19, 2017 SY19, 2017 SW19, 2017 SV19, 2017 SU19, 2017 ST19, 2017 ST16, 2017 SR19, 2017 SQ19, 2017 SP19, 2017 SO19, 2017 SN19, 2017 SM19, 2017 SM10, 2017 SL19, 2017 SL16, 2017 SL14, 2017 SK19, 2017 SK14, 2017 SJ20, 2017 SJ19, 2017 SJ10, 2017 SH2, 2017 SH19, 2017 SG19, 2017 SF19, 2017 SE20, 2017 SE19, 2017 SD20, 2017 SC20, 2017 SB20, 2017 SA20, 2017 RL16, 2017 RK1, 2017 RB12, 2017 PS25, 2013 SL30, 2012 CQ36, 2012 BC20, 2002 RT129, 1989 UP, 96744, 96631, 414990, 411201, 303250, 23714, 220839, 162679
6581Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2017-S229 -- 2017 SS19
W98Polonia Obs. in Chile, 1 in MPEC 2017-S215 -- 495511
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-S215 -- 2017 RB12
W25RMS Obs., 1 in MPEC 2017-S229 -- 2017 SS19
104San Marcello Pistoiese Obs. in Italy, 5 in MPECs 2017-S237, 2017-S241, 2017-S242, 2017-S245 & 2017-S247 -- 2017 SY19, 2017 SK20, 2017 SH20, 2017 SG20, 2017 SB20
Y00SONEAR in Brazil, 1 in MPEC 2017-S215 -- 66146
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2017-S215, 2017-S225 & 2017-S228 -- 2017 SR19, 2017 SN19, 2017 RB12, 142563, 1865
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2017-S217, 2017-S220, 2017-S222, 2017-S223, 2017-S224, 2017-S226, 2017-S227, 2017-S228 & 2017-S231 -- 2017 SU19, 2017 SR19, 2017 SQ19, 2017 SO19, 2017 SM19, 2017 SL19, 2017 SK19, 2017 SH19, 2017 SE19
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2017-S229 -- 2017 SS19
I52Steward Obs. Mt. Lemmon Station in Arizona, 15 in MPECs 2017-S229, 2017-S232, 2017-S233, 2017-S234, 2017-S235, 2017-S236, 2017-S237, 2017-S238, 2017-S239, 2017-S240, 2017-S241, 2017-S243, 2017-S245, 2017-S246 & 2017-S247 -- 2017 SZ19, 2017 SY19, 2017 SX19, 2017 SW19, 2017 SV19, 2017 SS19, 2017 SP19, 2017 SK20, 2017 SG20, 2017 SF20, 2017 SE20, 2017 SD20, 2017 SC20, 2017 SB20, 2017 SA20
J22Tacande Obs. in the Canary Islands, 1 in MPEC 2017-S215 -- 2004 SS
926Tenagra II Obs. in Arizona, 16 in MPECs 2017-S221, 2017-S224, 2017-S225, 2017-S229, 2017-S232, 2017-S233, 2017-S235, 2017-S236, 2017-S237, 2017-S238, 2017-S239, 2017-S241, 2017-S242, 2017-S243, 2017-S245 & 2017-S246 -- 2017 SZ19, 2017 SY19, 2017 SW19, 2017 SV19, 2017 SS19, 2017 SP19, 2017 SN19, 2017 SM19, 2017 SJ19, 2017 SH20, 2017 SG20, 2017 SE20, 2017 SD20, 2017 SC20, 2017 SB20, 2017 SA20
B18Terskol Obs. in Russia, 1 in MPEC 2017-S217 -- 2017 SE19
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-S216 -- 2013 FW13
2901program code 1 via Vatican Advanced Technology Telescope in Arizona, 1 in MPEC 2017-S215 -- 2017 RB12
C51WISE in Earth polar orbit, 2 in MPEC 2017-S215 -- 2010 WL, 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 September '17

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 is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few 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
2017 SF20JPL Sentry20002034-203411.268e-04-5.13-5.130JPL: Computed at 12:52 today Pacific time based on 21 observations spanning 1.9849 days (2017-Sep-28.36701 to 2017-Sep-30.35187). Diameter approximately 0.007 km. from weighted mean H=28.46.
2017 SA20JPL Sentry21012027-21174710.0032971222092-4.34-4.390JPL: Computed at 13:49 today Pacific time based on 24 observations spanning 5.8082 days (2017-Sep-24.41378 to 2017-Sep-30.22201). Diameter approximately 0.008 km. from weighted mean H=28.22.
2017 SE19JPL Sentry19002076-207618.298e-10-6.68-6.680JPL: Computed at 11:48 today Pacific time based on 20 observations spanning 7.9734 days (2017-Sep-22.52971 to 2017-Sep-30.50315). Diameter approximately 0.370 km. from weighted mean H=19.78.
2017 SU17NEODyS15532055-2117773.6e-05-6.13-6.710NEODyS: "Based on 20 optical observations (of which 1 are rejected as outliers) from 2017-09-26.445 to 2017-09-28.415."
2017 SM14NEODyS15532027-210562.39e-09-4.45-4.840NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2017-09-23.480 to 2017-09-27.467."
2017 SS12NEODyS15532074-2117199.4e-07-7.24-7.710NEODyS: "Based on 77 optical observations (of which 8 are rejected as outliers) from 2017-09-25.237 to 2017-09-29.261."
2017 SQ2NEODyS15532039-209224.02e-07-7.03-7.110NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2017-09-18.347 to 2017-09-27.627."
2017 RV2NEODyS15532071-2117454.93e-05-5.27-5.760NEODyS: "Based on 129 optical observations (of which 10 are rejected as outliers) from 2017-09-14.436 to 2017-09-27.493."
2012 TC4NEODyS15532077-2112151.03e-03-4.12-4.160NEODyS: "Based on 320 optical observations (of which 10 are rejected as outliers) from 2012-10-04.468 to 2017-09-28.457."

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 30 September '17

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

2101Noted that JPL Sentry has posted 2017 SA20 as an impact risk - see above
2052Updated Traffic Report
2000Noted that JPL Sentry has posted 2017 SF20 as an impact risk - see above
1900Noted that JPL Sentry has posted 2017 SE19 as an impact risk - see above
Grabbed MPEC 2017-S244 - 2017 SJ20 - see above
Grabbed MPEC 2017-S245 - 2017 SY19 - see above
Grabbed MPEC 2017-S246 - 2017 SE20 - see above
Grabbed MPEC 2017-S247 - 2017 SK20 - see above
1834Grabbed MPEC 2017-S235 - 2017 SZ19 - see above
Grabbed MPEC 2017-S236 - 2017 SA20 - see above
Grabbed MPEC 2017-S237 - 2017 SB20 - see above
Grabbed MPEC 2017-S238 - 2017 SC20 - see above
Grabbed MPEC 2017-S239 - 2017 SD20 - see above
Grabbed MPEC 2017-S240 - 2017 SF20 - see above
Grabbed MPEC 2017-S241 - 2017 SG20 - see above
Grabbed MPEC 2017-S242 - 2017 SH20 - see above
Grabbed MPEC 2017-S243 - 2017 SP19 - see above
1803Grabbed MPEC 2017-S229 - 2017 SS19 - see above
Grabbed MPEC 2017-S230 - 2017 ST19 - see above
Grabbed MPEC 2017-S231 - 2017 SU19 - see above
Grabbed MPEC 2017-S232 - 2017 SV19 - see above
Grabbed MPEC 2017-S233 - 2017 SW19 - see above
Grabbed MPEC 2017-S234 - 2017 SX19 - see above
1731Grabbed MPEC 2017-S221 - 2017 SJ19 - see above
Grabbed MPEC 2017-S222 - 2017 SK19 - see above
Grabbed MPEC 2017-S223 - 2017 SL19 - see above
Grabbed MPEC 2017-S224 - 2017 SM19 - see above
Grabbed MPEC 2017-S225 - 2017 SN19 - see above
Grabbed MPEC 2017-S226 - 2017 SO19 - see above
Grabbed MPEC 2017-S227 - 2017 SQ19 - see above
Grabbed MPEC 2017-S228 - 2017 SR19 - see above
1704Grabbed MPEC 2017-S217 - 2017 SE19 - see above
Grabbed MPEC 2017-S218 - 2017 SF19 - see above
Grabbed MPEC 2017-S219 - 2017 SG19 - see above
Grabbed MPEC 2017-S220 - 2017 SH19 - see above
1553Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that NEODyS has updated its 2017 RV2 risk assessment - see above
Noted that NEODyS has updated its 2017 SM14 risk assessment - see above
Noted that NEODyS has updated its 2017 SQ2 risk assessment - see above
Noted that NEODyS has updated its 2017 SS12 risk assessment - see above
Noted that NEODyS has updated its 2017 SU17 risk assessment - see above
Grabbed MPEC 2017-S215 - Daily Orbit Update - see above
Grabbed MPEC 2017-S216 - 2013 FW13 - see above