Contents  on 23 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 23 September '17

Eight objects reported inside ten LD

Eight minor planets are reported to be less than ten lunar distances (LD) of our planet today. The three nearest are intruder 2017 SR2, outbound from 4.65 to 6.79 LD, intruder 2017 SM2, moving away from 5.12 to 6.99 LD, and 2017 RB15, heading out from 5.77 to 5.89 LD.

Earth passage I D ~Size Distance Today  Notes
0.24 LD Sept. 202017 SR2 6 m  4.65 to 6.79 LD intruder
0.81 LD Sept. 202017 SM2 12 m  5.12 to 6.99 LD intruder
2.45 LD Sept. 172017 RK2 9 m  9.15 to 10.81 LD exits ten LD, risk
4.76 LD Sept. 262017 RB16 25 m  6.98 from 8.66 LD
4.96 LD Sept. 252017 RO16 9 m  6.02 from 7.24 LD DOU
5.77 LD yesterday2017 RB15 10 m  5.77 to 5.89 LD
7.85 LD Sept. 192017 RG2 45 m  9.94 to 11.19 LD exits ten LD
9.71 LD yesterday2017 RQ15 22 m  9.76 to 11.21 LD exits ten LD

This report was generated at 2140 UTC with the discoveries of approaching 2017 SS10 (MPEC) and already departed 2017 SR10 (MPEC), which flew past us at 3.66 LD on September 11th, and with the recovery of distant 2016 FW3 (MPEC). Today's DOU MPEC has first follow-up for departed 2017 SP2 and continuing follow-up for inbound 2017 RO16, approaching radar targets 2012 TC4 and 1989 VB, departed 2017 RS2 and radar target 2017 CS, and distant 2014 CU13.

Arecibo news:  As noted on the Minor Planet Mailing List (MPML), National Geographic has a report on Arecibo Observatory. The "staff sheltering on-site are safe [and] the world's most iconic radio telescope ... has come through Hurricane Maria mostly intact, but with some significant damage." Reportedly the large line feed antenna "broke in half and fell about 500 feet into the huge dish below, puncturing it in several places."

Approaching (sorted by 10-LD bubble entry date)
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25, radar target - DOU
9.92 LD Sept. 272017 SS10 31 m  < 10 LD Sept. 26, NEW - MPEC
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. "Distant" is used here to describe an object that has come within ten LD since A/CC began these traffic reports (2007) but is not currently so close. 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 23 September '17

The MPC's NEO Confirmation Page has 105 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 105 objects listed. Of these, 42 were "one nighters." So far The Tracking News has counted a total of 110 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 23 September '17

Minor Planet Electronic Circulars

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


<< DOU on 23 Sept. '17 >>  MPEC 2017-S117 - "12:12 UT" - Daily Orbit Update


MPEC 2017-S116 - "11:56 UT" - 2014 TW57


MPEC 2017-S115 - "11:54 UT" - 2008 SP7


MPEC 2017-S114 - "11:52 UT" - 2004 SS


MPEC 2017-S113 - "11:46 UT" - 2016 FW3


MPEC 2017-S112 - "02:27 UT" - 2017 SR10


MPEC 2017-S111 - "02:19 UT" - 2017 SS10


MPEC 2017-S110 - "02:12 UT" - 2017 RN17

Observers  on 23 September '17

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 5 in MPEC 2017-S117 -- 2017 RV1, 2017 PJ26, 2014 YC15, 441825, 265962
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPEC 2017-S117 -- 2017 RV, 2017 MV2, 2017 CS, 2008 HV4, 477519, 374449, 253586, 222165, 141670
T05ATLAS Haleakala in Hawaii, 18 in MPECs 2017-S114 & 2017-S117 -- 2017 OQ68, 2004 SS, 2004 RE84, 1989 UP, 96631, 85709, 66146, 53319, 495858, 416584, 411201, 337228, 20826, 162998, 142464, 141670, 138911, 11405
160Castelmartini Obs. in Italy, 2 in MPECs 2017-S111 & 2017-S117 -- 2017 SS10, 2017 RX1
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2017-S112 & 2017-S117 -- 2017 SR10, 2017 RX1, 7336
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2017-S115 & 2017-S117 -- 2017 SH2, 2017 RY15, 2017 RS2, 2017 QR17, 2017 QH18, 2017 PX26, 2017 CH1, 2008 SP7
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2017-S117 -- 2017 RX1
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2017-S117 -- 203015
113Drebach Obs. in Germany, 2 in MPECs 2017-S111 & 2017-S117 -- 2017 SS10, 2017 RX1
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2017-S111 & 2017-S117 -- 2017 SS10, 2017 RX1
J95Great Shefford Obs. in England, 2 in MPECs 2017-S111 & 2017-S114 -- 2017 SS10, 2004 SS
A17Guidestar Obs. in Germany, 1 in MPEC 2017-S111 -- 2017 SS10
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-S117 -- 1989 VB
Z87Laver Obs. in England, 2 in MPEC 2017-S117 -- 90075, 265962
K30Luscherz Obs. in Switzerland, 1 in MPEC 2017-S117 -- 2017 RX1
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2017-S110 -- 2017 RN17
675<program code "<" (37) via Mount Palomar in southern California, 1 in MPEC 2017-S110 -- 2017 RN17
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2017-S117 -- 2017 RX1, 153415
C47Nonndorf Obs. in Austria, 2 in MPEC 2017-S117 -- 2017 RV1, 2017 PR25
Z80Northolt Branch Obs. in England, 3 in MPEC 2017-S117 -- 2015 KN120, 2014 YC15, 3122
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-S117 -- 2017 RX1
C23Olmen Obs. in Belgium, 1 in MPEC 2017-S117 -- 2017 PJ26
F51Pan-STARRS 1 (PS1) in Hawaii, 44 in MPECs 2017-S111, 2017-S112, 2017-S116 & 2017-S117 -- 2017 SS10, 2017 SR10, 2017 SN2, 2017 RU1, 2017 RL16, 2017 RL15, 2017 RC15, 2017 QY16, 2017 QS32, 2017 QQ32, 2017 QL35, 2017 QL18, 2017 QJ18, 2017 OV68, 2017 OJ19, 2017 OH68, 2017 MY3, 2015 CN62, 2014 TW57, 2014 QL433, 2014 CU13, 2012 TC4, 2012 CO46, 2010 SA12, 2007 RT146, 2004 TD10, 2001 UQ163, 85867, 55532, 52768, 496018, 434051, 417949, 416584, 407653, 355770, 351370, 286080, 23548, 190166, 154007, 152667, 139211, 9202
Z38Picoto Obs., 2 in MPEC 2017-S117 -- 90075, 7336
J41Raheny Obs. in Ireland, 1 in MPEC 2017-S117 -- 2017 RX1
B04Saint-Barthelemy Obs. in Italy, 2 in MPECs 2017-S111 & 2017-S117 -- 2017 SS10, 2017 RX1
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-S111 & 2017-S117 -- 2017 SS10, 2017 RX1
W88!program code "!" (10) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-S114 -- 2004 SS
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2017-S117 -- 333888
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2017-S117 -- 2017 OL1, 2016 SP2, 2014 US192
I52Steward Obs. Mt. Lemmon Station in Arizona, 5 in MPECs 2017-S111 & 2017-S117 -- 2017 SS10, 2017 SP2, 2017 RY15, 2017 RN15, 2017 OV68
926Tenagra II Obs. in Arizona, 2 in MPECs 2017-S116 & 2017-S117 -- 2017 RO16, 2014 TW57
H32Texas A&M Physics Obs. in Texas, 1 in MPEC 2017-S117 -- 3122
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-S113 -- 2016 FW3
C51WISE in Earth polar orbit, 2 in MPECs 2017-S110 & 2017-S117 -- 2017 RN17, 2017 MB1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 RN16NEODyS20022060-2117493.13e-05-6.75-7.310NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2017-09-15.406 to 2017-09-20.309."
2017 RV2NEODyS20022071-2117464.92e-05-5.25-5.70NEODyS: "Based on 120 optical observations (of which 9 are rejected as outliers) from 2017-09-14.436 to 2017-09-22.376."
2017 MB1NEODyS2034209814.59e-09-5.28-5.280NEODyS: "Based on 438 optical observations (of which 29 are rejected as outliers) from 2017-06-19.315 to 2017-07-25.110."
JPL Sentry16502098-209821.97715e-07-3.46-3.470JPL: Computed at 07:57 today Pacific time based on 434 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.
2016 FW3NEODyS2002R E M O V E D-
JPL Sentry1650R E M O V E DJPL: Risk listing removed at 1403 UTC today.
2012 TC4NEODyS20342050-2112607.01e-04-4.27-4.60NEODyS #2 for the day: "Based on 300 optical observations (of which 9 are rejected as outliers) from 2012-10-04.468 to 2017-09-22.407."
2012 BP123JPL Sentry16502021-21173061.3384781e-06-6.87-7.700JPL: Computed at 09:34 April 8th Pacific time based on 13 observations spanning .91365 days (2012-Jan-31.31538 to 2012-Feb-01.22903). Diameter approximately 0.013 km. from weighted mean H=27.11.

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 23 September '17

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

2140Generated Traffic Report
2034Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that NEODyS has updated its 2017 MB1 risk assessment - see above
2002Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that NEODyS has removed 2016 FW3 as an impact risk - see above
Noted that NEODyS has updated its 2017 RN16 risk assessment - see above
Noted that NEODyS has updated its 2017 RV2 risk assessment - see above
1650Noted that JPL Sentry has updated its 2012 BP123 risk assessment - see above
Noted that JPL Sentry has removed 2016 FW3 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 MB1 risk assessment - see above
Grabbed MPEC 2017-S113 - 2016 FW3 - see above
Grabbed MPEC 2017-S114 - 2004 SS - see above
Grabbed MPEC 2017-S115 - 2008 SP7 - see above
Grabbed MPEC 2017-S116 - 2014 TW57 - see above
Grabbed MPEC 2017-S117 - Daily Orbit Update - see above
0319Grabbed MPEC 2017-S112 - 2017 SR10 - see above
0224Grabbed MPEC 2017-S110 - 2017 RN17 - see above
Grabbed MPEC 2017-S111 - 2017 SS10 - see above