Contents  on 25 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 25 September '17

Seven objects reported inside ten LD

Seven Solar-System small bodies are known to be less than ten lunar distances (LD) from Earth today. Nearest is 2017 ST10, which moves away from 3.16 to 4.63 LD. And, way further out, rather large radar target 1989 VB enters our ten-LD traffic reporting "bubble," slipping in from 10.39 to 9.54 LD.

Earth passage I D ~Size Distance Today  Notes
0.24 LD Sept. 202017 SR2 6 m  8.94 to 11.10 LD exits ten LD, intruder
0.81 LD Sept. 202017 SM2 12 m  8.86 to 10.74 LD exits ten LD, intruder
2.76 LD yesterday2017 ST10 7 m  3.16 to 4.63 LD DOU
4.76 LD tomorrow2017 RB16 25 m  4.83 from 5.61 LD DOU
4.96 LD today2017 RO16 10 m  4.96 LD Earth closest at 2016 UTC - DOU
5.77 LD Sept. 222017 RB15 10 m  6.22 to 6.72 LD
7.87 LD Sept. 291989 VB 389 m  9.54 from 10.39 LD enters ten LD, radar target

This report was updated at 2310 UTC with the discoveries of four already departed objects: 2017 SE12 (MPEC) flew past us at about 5.0 LD on September 16th, 2017 SD12 (MPEC) went by at 3.24 LD on the 19th, 2017 SB12 (MPEC) passed at about 9.6 LD on the 10th, and 2017 RO17 (MPEC) snuck by at 4.58 LD back on the 3rd.
        Your first neighborhood small bodies traffic report was generated at 1906 UTC with pre-discovery observation of departed risk-listed 2017 RN16 (3.09 days added to the prior 4.90-day observing arc) in today's DOU MPEC along with additional observation of 2017 ST10 within its discovery arc and continuing follow-up for 2017 RO16, 2017 RB16, 2012 TC4, and departed radar target, 2017 CS.

Approaching (sorted by 10-LD bubble entry date)
9.92 LD Sept. 272017 SS10 31 m  < 10 LD tomorrow
0.13 LD Oct. 122012 TC4 15 m  < 10 LD Oct. 5, intruder, radar/NHATS target, risk - DOU
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 25 September '17

The MPC's NEO Confirmation Page has 192 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 192 objects listed. Of these, 112 were "one nighters." So far The Tracking News has counted a total of 246 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 25 September '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been 31 MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-S151 - "22:01 UT" - 2017 SO12


MPEC 2017-S150 - "21:58 UT" - 2017 SR12


MPEC 2017-S149 - "21:54 UT" - 2017 SQ12


MPEC 2017-S148 - "21:50 UT" - 2017 SP12


MPEC 2017-S147 - "21:46 UT" - 2017 SN12


MPEC 2017-S146 - "21:37 UT" - 2017 SM12


MPEC 2017-S145 - "21:33 UT" - 2017 SL12


MPEC 2017-S144 - "21:28 UT" - 2017 SK12


MPEC 2017-S143 - "21:23 UT" - 2017 SJ12


MPEC 2017-S142 - "21:18 UT" - 2017 SH12


MPEC 2017-S141 - "21:14 UT" - 2017 SG12


MPEC 2017-S140 - "21:10 UT" - 2017 SF12


MPEC 2017-S139 - "21:06 UT" - 2017 SE12


MPEC 2017-S138 - "21:03 UT" - 2017 SD12


MPEC 2017-S137 - "20:59 UT" - 2017 SC12


MPEC 2017-S136 - "20:55 UT" - 2017 SB12


MPEC 2017-S135 - "20:51 UT" - 2017 SA12


MPEC 2017-S134 - "20:48 UT" - 2017 SZ11


MPEC 2017-S133 - "20:44 UT" - 2017 SY11


MPEC 2017-S132 - "20:41 UT" - 2017 SX11


MPEC 2017-S131 - "20:38 UT" - 2017 SW11


MPEC 2017-S130 - "20:27 UT" - 2017 SV11


MPEC 2017-S129 - "20:22 UT" - 2017 SU11


MPEC 2017-S128 - "20:19 UT" - 2017 ST11


MPEC 2017-S127 - "20:16 UT" - 2017 SS11


MPEC 2017-S126 - "20:12 UT" - 2017 SR11


MPEC 2017-S125 - "20:09 UT" - 2017 SQ11


MPEC 2017-S124 - "20:05 UT" - 2017 RP17


MPEC 2017-S123 - "20:01 UT" - 2017 RO17


<< DOU on 25 Sept. '17 >>  MPEC 2017-S122 - "12:04 UT" - Daily Orbit Update


MPEC 2017-S121 - "11:43 UT" - 2008 ET7

Observers  on 25 September '17

A total of 44 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 7 in MPEC 2017-S122 -- 2014 YC15, 68950, 496018, 242211, 142464, 7336, 3122
E23Arcadia Obs. in New South Wales, 2 in MPECs 2017-S138 & 2017-S148 -- 2017 SP12, 2017 SD12
H21Astronomical Research Obs. Westfield in Illinois, 27 in MPECs 2017-S122, 2017-S124, 2017-S126, 2017-S128, 2017-S129, 2017-S130, 2017-S132, 2017-S134, 2017-S135, 2017-S137, 2017-S138, 2017-S140, 2017-S141, 2017-S142, 2017-S145, 2017-S146, 2017-S147, 2017-S149 & 2017-S150 -- 2017 SZ11, 2017 SX11, 2017 SV11, 2017 SU11, 2017 ST11, 2017 SR12, 2017 SR11, 2017 SQ12, 2017 SN12, 2017 SM12, 2017 SL12, 2017 SH12, 2017 SG12, 2017 SF12, 2017 SD12, 2017 SC12, 2017 SA12, 2017 RY15, 2017 RV1, 2017 RP17, 2017 QV34, 2017 QQ35, 2017 QM18, 2017 QL35, 2017 PS25, 2017 FJ90, 2012 TC4
T05ATLAS Haleakala in Hawaii, 2 in MPECs 2017-S138 & 2017-S146 -- 2017 SM12, 2017 SD12
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-S146 -- 2017 SM12
160Castelmartini Obs. in Italy, 12 in MPECs 2017-S122 & 2017-S138 -- 2017 SD12, 2017 MB1, 2017 CS, 485652, 416584, 366733, 294739, 232368, 20460, 141670, 7977, 5660
703Catalina Sky Survey (CSS) in Arizona, 26 in MPECs 2017-S122 & 2017-S138 -- 2017 SD12, 2017 RX1, 2017 RU, 2017 RK1, 2017 QT35, 2017 OP68, 2014 CD13, 2010 SA12, 2009 WC52, 2008 AX28, 2006 KA40, 2004 RE84, 96744, 90075, 65679, 338176, 333888, 285263, 190208, 162998, 143624, 142563, 142464, 11500, 8567, 6611
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPECs 2017-S122, 2017-S127, 2017-S128, 2017-S139 & 2017-S148 -- 2017 ST11, 2017 SS11, 2017 SP12, 2017 SO2, 2017 SL2, 2017 SK10, 2017 SE12, 2017 QM35, 2017 OU67, 2017 KE5
G58Chabot Obs. in northern California, 2 in MPECs 2017-S130 & 2017-S146 -- 2017 SV11, 2017 SM12
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-S138 -- 2017 SD12
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2017-S138 -- 2017 SD12
958Dax Obs. in France, 1 in MPEC 2017-S138 -- 2017 SD12
113Drebach Obs. in Germany, 1 in MPEC 2017-S138 -- 2017 SD12
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2017-S138 -- 2017 SD12
J95Great Shefford Obs. in England, 1 in MPEC 2017-S130 -- 2017 SV11
A17Guidestar Obs. in Germany, 1 in MPEC 2017-S138 -- 2017 SD12
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-S138 -- 2017 SD12
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-S138 -- 2017 SD12
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-S130 -- 2017 SV11
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2017-S122 -- 2014 YC15
W85LCOGT Cerro Tololo A in Chile, 4 in MPECs 2017-S127, 2017-S128, 2017-S141 & 2017-S144 -- 2017 ST11, 2017 SS11, 2017 SK12, 2017 SG12
T04LCOGT Haleakala OGG B#2 in Hawaii, 1 in MPEC 2017-S131 -- 2017 SW11
844Los Molinos Obs. in Uruguay, 1 in MPEC 2017-S138 -- 2017 SD12
K30Luscherz Obs. in Switzerland, 1 in MPEC 2017-S138 -- 2017 SD12
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-S149 -- 2017 SQ12
W92MASTER OAFA Obs., 1 in MPEC 2017-S122 -- 416584
K95MASTER-II Sutherland in South Africa, 2 in MPEC 2017-S122 -- 142561, 142464
568_Marco Micheli on Mauna Kea in Hawaii, 17 in MPECs 2017-S123, 2017-S128, 2017-S129, 2017-S130, 2017-S132, 2017-S133, 2017-S134, 2017-S135, 2017-S136, 2017-S137, 2017-S140, 2017-S142, 2017-S143, 2017-S144, 2017-S145, 2017-S148 & 2017-S151 -- 2017 SZ11, 2017 SY11, 2017 SX11, 2017 SV11, 2017 SU11, 2017 ST11, 2017 SP12, 2017 SO12, 2017 SL12, 2017 SK12, 2017 SJ12, 2017 SH12, 2017 SF12, 2017 SC12, 2017 SB12, 2017 SA12, 2017 RO17
G96Mt. Lemmon Survey (MLS) in Arizona, 26 in MPECs 2017-S122, 2017-S130, 2017-S138, 2017-S146 & 2017-S149 -- 2017 SV11, 2017 SQ12, 2017 SM12, 2017 SD12, 2017 RX1, 2017 RU1, 2017 RP15, 2017 PF, 2017 PA27, 2017 HS, 2016 GA222, 2016 AA9, 2012 PN28, 2012 EC, 2008 AX28, 2004 TQ13, 52762, 496005, 367525, 285263, 162215, 162186, 143404, 141851, 136745, 9950
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-S138 -- 2017 SD12
F51Pan-STARRS 1 (PS1) in Hawaii, 70 in MPECs 2017-S121, 2017-S122, 2017-S123, 2017-S124, 2017-S125, 2017-S126, 2017-S127, 2017-S128, 2017-S129, 2017-S130, 2017-S131, 2017-S132, 2017-S133, 2017-S134, 2017-S135, 2017-S136, 2017-S137, 2017-S139, 2017-S140, 2017-S141, 2017-S142, 2017-S143, 2017-S144, 2017-S145, 2017-S147, 2017-S148, 2017-S149, 2017-S150 & 2017-S151 -- 2017 SZ11, 2017 SY11, 2017 SX11, 2017 SW11, 2017 SV11, 2017 SU11, 2017 ST11, 2017 SS11, 2017 SR12, 2017 SR11, 2017 SQ12, 2017 SQ11, 2017 SP12, 2017 SO12, 2017 SN12, 2017 SN10, 2017 SL12, 2017 SK12, 2017 SJ12, 2017 SH12, 2017 SG12, 2017 SF12, 2017 SE12, 2017 SC12, 2017 SB12, 2017 SA12, 2017 RX15, 2017 RV15, 2017 RU, 2017 RP17, 2017 RO17, 2017 RN16, 2017 RK1, 2017 QL35, 2017 QH33, 2017 QG3, 2017 HS, 2017 HH, 2015 VR1, 2014 QL390, 2011 CO2, 2009 WC52, 2008 ET7, 2007 TR65, 2007 RT146, 2004 TA1, 2003 YT124, 2003 SJ154, 2002 RT129, 1993 RA, 85938, 85709, 55408, 495511, 451003, 414990, 411201, 385580, 376788, 349925, 303933, 288807, 220839, 20826, 194386, 152667, 143404, 106538, 8201, 2201
B49Paus Obs. in Spain, 2 in MPECs 2017-S138 & 2017-S146 -- 2017 SM12, 2017 SD12
J41Raheny Obs. in Ireland, 1 in MPEC 2017-S138 -- 2017 SD12
W25RMS Obs., 2 in MPECs 2017-S138 & 2017-S146 -- 2017 SM12, 2017 SD12
B04Saint-Barthelemy Obs. in Italy, 2 in MPECs 2017-S138 & 2017-S139 -- 2017 SE12, 2017 SD12
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2017-S122, 2017-S138 & 2017-S139 -- 2017 ST10, 2017 SE12, 2017 SD12
K14Sencelles Obs. in Spain, 1 in MPEC 2017-S122 -- 2017 PJ26
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2017-S125, 2017-S127, 2017-S133, 2017-S145 & 2017-S146 -- 2017 SY11, 2017 SS11, 2017 SQ11, 2017 SM12, 2017 SL12
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2017-S124, 2017-S125, 2017-S126, 2017-S144, 2017-S145 & 2017-S151 -- 2017 SR11, 2017 SQ11, 2017 SO12, 2017 SL12, 2017 SK12, 2017 RP17
I52Steward Obs. Mt. Lemmon Station in Arizona, 14 in MPECs 2017-S122, 2017-S125, 2017-S127, 2017-S129, 2017-S130, 2017-S131, 2017-S132, 2017-S134, 2017-S138, 2017-S143, 2017-S144, 2017-S146, 2017-S147 & 2017-S149 -- 2017 SZ11, 2017 SX11, 2017 SW11, 2017 SV11, 2017 SU11, 2017 SS11, 2017 SQ12, 2017 SQ11, 2017 SO2, 2017 SN12, 2017 SM12, 2017 SK12, 2017 SJ12, 2017 SD12
926Tenagra II Obs. in Arizona, 23 in MPECs 2017-S122, 2017-S125, 2017-S127, 2017-S128, 2017-S129, 2017-S130, 2017-S131, 2017-S132, 2017-S133, 2017-S134, 2017-S135, 2017-S136, 2017-S137, 2017-S139, 2017-S140, 2017-S141, 2017-S142, 2017-S143, 2017-S144, 2017-S146, 2017-S147 & 2017-S151 -- 2017 SZ11, 2017 SY11, 2017 SX11, 2017 SW11, 2017 SV11, 2017 SU11, 2017 ST11, 2017 SS11, 2017 SQ11, 2017 SO12, 2017 SN12, 2017 SM12, 2017 SK12, 2017 SJ12, 2017 SH12, 2017 SG12, 2017 SF12, 2017 SE12, 2017 SC12, 2017 SB12, 2017 SA12, 2017 RO16, 2017 RB16
B18Terskol Obs. in Russia, 4 in MPECs 2017-S131, 2017-S133, 2017-S135 & 2017-S145 -- 2017 SY11, 2017 SW11, 2017 SL12, 2017 SA12
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-S122 -- 2017 RN2
K41Vegaquattro Obs. in Italy, 1 in MPEC 2017-S138 -- 2017 SD12
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 SE12JPL Sentry23262107-210716.385e-10-10.50-10.50JPL: Computed at 16:02 today Pacific time based on 13 observations spanning .80820 days (2017-Sep-22.33041 to 2017-Sep-23.13861). Diameter approximately 0.014 km. from weighted mean H=26.87.
2017 RP16NEODyS16062065-2117165.02e-06-6.63-6.930NEODyS: "Based on 19 optical observations (of which 4 are rejected as outliers) from 2017-09-15.412 to 2017-09-23.200."
2017 RN16JPL Sentry16062076-2117305.4149401e-05-6.56-6.700JPL: Computed at 08:08 today Pacific time based on 17 observations spanning 7.9949 days (2017-Sep-12.31378 to 2017-Sep-20.308696). Diameter approximately 0.005 km. from weighted mean H=29.07.
2017 MB1JPL Sentry16062098-209811.921e-07-3.47-3.470JPL: Computed at 07:58 today Pacific time based on 437 observations spanning 35.795 days (2017-Jun-19.31418 to 2017-Jul-25.109676). Diameter approximately 0.700 km. from weighted mean H=18.80.
2010 XPJPL Sentry16062021-2116731.449284e-07-7.46-7.910JPL: Computed at 11:10 April 8th Pacific time based on 15 observations spanning .11834 days (2010-Dec-02.24919 to 2010-Dec-02.36753). Diameter approximately 0.015 km. from weighted mean H=26.78.

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 25 September '17

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

2326Noted that JPL Sentry has posted 2017 SE12 as an impact risk - see above
2310Updated Traffic Report
2231Grabbed MPEC 2017-S151 - 2017 SO12 - see above
2200Grabbed MPEC 2017-S145 - 2017 SL12 - see above
Grabbed MPEC 2017-S146 - 2017 SM12 - see above
Grabbed MPEC 2017-S147 - 2017 SN12 - see above
Grabbed MPEC 2017-S148 - 2017 SP12 - see above
Grabbed MPEC 2017-S149 - 2017 SQ12 - see above
Grabbed MPEC 2017-S150 - 2017 SR12 - see above
2130Grabbed MPEC 2017-S139 - 2017 SE12 - see above
Grabbed MPEC 2017-S140 - 2017 SF12 - see above
Grabbed MPEC 2017-S141 - 2017 SG12 - see above
Grabbed MPEC 2017-S142 - 2017 SH12 - see above
Grabbed MPEC 2017-S143 - 2017 SJ12 - see above
Grabbed MPEC 2017-S144 - 2017 SK12 - see above
2106Grabbed MPEC 2017-S124 - 2017 RP17 - see above
Grabbed MPEC 2017-S125 - 2017 SQ11 - see above
Grabbed MPEC 2017-S126 - 2017 SR11 - see above
Grabbed MPEC 2017-S127 - 2017 SS11 - see above
Grabbed MPEC 2017-S128 - 2017 ST11 - see above
Grabbed MPEC 2017-S129 - 2017 SU11 - see above
Grabbed MPEC 2017-S130 - 2017 SV11 - see above
Grabbed MPEC 2017-S131 - 2017 SW11 - see above
Grabbed MPEC 2017-S132 - 2017 SX11 - see above
Grabbed MPEC 2017-S133 - 2017 SY11 - see above
Grabbed MPEC 2017-S134 - 2017 SZ11 - see above
Grabbed MPEC 2017-S135 - 2017 SA12 - see above
Grabbed MPEC 2017-S136 - 2017 SB12 - see above
Grabbed MPEC 2017-S137 - 2017 SC12 - see above
Grabbed MPEC 2017-S138 - 2017 SD12 - see above
2005Grabbed MPEC 2017-S123 - 2017 RO17 - see above
1606Noted that JPL Sentry has updated its 2010 XP risk assessment - see above
Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
Noted that JPL Sentry has updated its 2017 RN16 risk assessment - see above
Noted that NEODyS has updated its 2017 RP16 risk assessment - see above
Grabbed MPEC 2017-S121 - 2008 ET7 - see above
Grabbed MPEC 2017-S122 - Daily Orbit Update - see above