Radar image of 3122 Florence & two moons from Arecibo Sept. 4th. 
Credit: Arecibo/NASA/NSF

NASA/JPL has another report about the observing campaign for 3122 Florence (1981 ET3) and its two moons, which are seen as thin vertical streaks in the above radar imagery from Arecibo from September 4th. Visible near-infrared spectroscopy indicates this large object's surface composition is similar to an ordinary chondritic (stony) meteorite. Image credit: Arecibo/NASA/NSF.


Contents  on 18 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 18 September '17

Eight objects reported inside ten LD

Eight visitors are known to be less than ten lunar distances (LD) from Earth today. Nearest is risk-listed 2017 RK2, outbound from 2.46 to 3.12 LD.

Earth passage I D ~Size Distance Today  Notes
1.43 LD Sept. 152017 RJ2 11 m  7.49 to 11.01 LD risk, exits ten LD
2.16 LD Sept. 122017 RV2 19 m  9.10 to 10.57 LD risk, exits ten LD
2.45 LD yesterday2017 RK2 8 m  2.46 to 3.12 LD risk - DOU
5.76 LD Sept. 222017 RB15 9 m  7.30 from 8.05 LD NEW - MPEC
6.17 LD today2017 RX2 18 m  6.17 LD risk, Earth closest at 1659 UTC
6.44 LD Sept. 122017 RS2 19 m  8.61 to 9.29 LD DOU
6.79 LD today2017 RU2 22 m  6.79 LD risk, Earth closest at 2123 UTC
7.86 LD tomorrow2017 RG2 44 m  7.99 from 8.55 LD DOU
Approaching (sorted by 10-LD bubble entry date)
4.76 LD Sept. 262017 RB16 26 m  < 10 LD Sept. 22, NEW - MPEC
9.77 LD Sept. 222017 RQ15 21 m  < 10 LD Sept. 22, NEW - MPEC
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25, radar target
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

This report was generated at 2012 UTC with the discoveries of two approaching objects and one already inside ten LD, as noted in the above active traffic table, and of an object that has already departed: 2017 RZ15 (MPEC), which flew by us at about 5.9 LD on September 3rd. Today's DOU MPEC has additional observation of yesterday's discoveries 2017 RS2, 2017 RG2, and risk-listed 2017 RK2, as well as continuing follow-up for approaching risk-listed radar/NHATS target 2012 TC4 and departed objects 2017 NB7 and risk-listed 2017 RC, plus astrometry from May for 2017 KR27, and the recovery of distant 2014 HQ124.



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 now 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 18 September '17

The MPC's NEO Confirmation Page has 93 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 93 objects listed. Of these, 25 were "one nighters." So far The Tracking News has counted a total of 165 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 18 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-S54 - "23:30 UT" - 2010 JO179


MPEC 2017-S53 - "22:07 UT" - 2013 SL30


MPEC 2017-S52 - "17:48 UT" - 2004 RE84


MPEC 2017-S51 - "15:59 UT" - 2017 RY15


MPEC 2017-S50 - "15:56 UT" - 2017 RW15


MPEC 2017-S49 - "15:52 UT" - 2017 RB16


MPEC 2017-S48 - "15:48 UT" - 2017 RA16


MPEC 2017-S47 - "15:45 UT" - 2017 RZ15


MPEC 2017-S46 - "15:37 UT" - 2017 RX15


MPEC 2017-S45 - "15:33 UT" - 2017 RV15


MPEC 2017-S44 - "15:29 UT" - 2017 RU15


MPEC 2017-S43 - "15:25 UT" - 2017 RT15


MPEC 2017-S42 - "15:21 UT" - 2017 RS15


MPEC 2017-S41 - "15:18 UT" - 2017 RR15


MPEC 2017-S40 - "15:14 UT" - 2017 RQ15


MPEC 2017-S39 - "15:09 UT" - 2017 RP15


MPEC 2017-S38 - "15:07 UT" - 2017 RO15


MPEC 2017-S37 - "15:03 UT" - 2017 RN15


MPEC 2017-S36 - "14:59 UT" - 2017 RM15


MPEC 2017-S35 - "14:55 UT" - 2017 RL15


MPEC 2017-S34 - "14:49 UT" - 2017 RK15


MPEC 2017-S33 - "14:46 UT" - 2017 RJ15


MPEC 2017-S32 - "14:41 UT" - 2017 RH15


MPEC 2017-S31 - "14:35 UT" - 2017 RG15


MPEC 2017-S30 - "14:24 UT" - 2017 RF15


MPEC 2017-S29 - "14:19 UT" - 2017 RE15


MPEC 2017-S28 - "14:15 UT" - 2017 RD15


MPEC 2017-S27 - "14:10 UT" - 2017 RC15


MPEC 2017-S26 - "14:04 UT" - 2017 RB15


<< DOU on 18 Sept. '17 >>  MPEC 2017-S25 - "12:04 UT" - Daily Orbit Update


MPEC 2017-S24 - "11:05 UT" - 2017 RA14


MPEC 2017-S23 - "10:21 UT" - 2014 CD13


MPEC 2017-S22 - "02:30 UT" - 2015 VR1

Observers  on 18 September '17

A total of 37 observers appear in today's MPECs.

CodeObserver / observatory
C97Al-Fulaij Obs., 5 in MPEC 2017-S25 -- 326388, 265962, 220909, 7336, 1980
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-S51 -- 2017 RY15
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2017-S25, 2017-S27, 2017-S30, 2017-S31, 2017-S34, 2017-S35, 2017-S38, 2017-S39, 2017-S41, 2017-S42, 2017-S44, 2017-S45, 2017-S46, 2017-S48 & 2017-S51 -- 2017 RY15, 2017 RX15, 2017 RW2, 2017 RV15, 2017 RU15, 2017 RS2, 2017 RS15, 2017 RR15, 2017 RP15, 2017 RO2, 2017 RO15, 2017 RL2, 2017 RL15, 2017 RK15, 2017 RG15, 2017 RF15, 2017 RC15, 2017 RA16
T05ATLAS Haleakala in Hawaii, 9 in MPECs 2017-S25 & 2017-S52 -- 2017 OD1, 2004 RE84, 1998 SZ27, 1998 SB15, 89355, 374038, 21374, 159467, 137799
T08ATLAS Mauna Loa in Hawaii, 26 in MPECs 2017-S23 & 2017-S25 -- 2017 RX1, 2017 PJ26, 2016 AA9, 2014 YC15, 2014 CD13, 2006 KA40, 2004 TQ13, 90075, 68950, 65679, 52762, 496018, 495848, 338176, 333888, 265962, 190208, 159399, 143624, 143404, 142464, 142040, 11500, 100926, 8037, 2212
Q68Blue Mountains Obs. in New South Wales, 1 in MPEC 2017-S25 -- 154589
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2017-S25 & 2017-S52 -- 2017 RV1, 2017 RQ2, 2017 MY3, 2004 RE84, 1989 UP, 411201, 190166, 137799, 5143, 3288
107Cavezzo Obs. in Italy, 2 in MPEC 2017-S25 -- 2017 PJ26, 2017 OP68
807Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-S54 -- 2010 JO179
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2017-S24, 2017-S25, 2017-S28, 2017-S30, 2017-S32, 2017-S43, 2017-S44 & 2017-S47 -- 2017 RZ15, 2017 RU15, 2017 RT15, 2017 RP2, 2017 RO2, 2017 RH15, 2017 RF15, 2017 RD15, 2017 RA14
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-S23 -- 2014 CD13
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2017-S22, 2017-S25 & 2017-S50 -- 2017 RW15, 2015 VR1, 2012 TC4
006Fabra Obs. in Spain, 1 in MPEC 2017-S25 -- 3122
734Farpoint Obs. in Kansas, 1 in MPEC 2017-S27 -- 2017 RC15
J95Great Shefford Obs. in England, 2 in MPECs 2017-S25 & 2017-S26 -- 2017 RK2, 2017 RB15
A17Guidestar Obs. in Germany, 1 in MPEC 2017-S45 -- 2017 RV15
G48Harlingten Research Obs. in New Mexico, 3 in MPEC 2017-S25 -- 2017 RW1, 2017 RV1, 2017 OP68
Q62@D. Brandt in Minnesota via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-S51 -- 2017 RY15
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-S51 -- 2017 RY15
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-S52 -- 2004 RE84
W19Kalamazoo Obs. in Michigan, 1 in MPEC 2017-S25 -- 6053
809La Silla in Chile, 1 in MPEC 2017-S54 -- 2010 JO179
W85LCOGT Cerro Tololo A in Chile, 3 in MPECs 2017-S28, 2017-S41 & 2017-S50 -- 2017 RW15, 2017 RR15, 2017 RD15
W92MASTER OAFA Obs., 1 in MPEC 2017-S25 -- 496018
568_Marco Micheli on Mauna Kea in Hawaii, 24 in MPECs 2017-S25, 2017-S26, 2017-S27, 2017-S28, 2017-S29, 2017-S30, 2017-S31, 2017-S32, 2017-S33, 2017-S34, 2017-S35, 2017-S36, 2017-S37, 2017-S38, 2017-S39, 2017-S40, 2017-S43, 2017-S44, 2017-S46, 2017-S47, 2017-S49 & 2017-S51 -- 2017 SA, 2017 RZ15, 2017 RY15, 2017 RX15, 2017 RU15, 2017 RT15, 2017 RQ15, 2017 RP15, 2017 RO15, 2017 RN15, 2017 RM15, 2017 RL15, 2017 RK15, 2017 RJ15, 2017 RH15, 2017 RG15, 2017 RF15, 2017 RE15, 2017 RD15, 2017 RC15, 2017 RB16, 2017 RB15, 2004 RY10, 2000 YG29
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2017-S24 -- 2017 RA14
F51Pan-STARRS 1 (PS1) in Hawaii, 54 in MPECs 2017-S24, 2017-S25, 2017-S26, 2017-S27, 2017-S28, 2017-S29, 2017-S30, 2017-S31, 2017-S32, 2017-S33, 2017-S34, 2017-S35, 2017-S36, 2017-S37, 2017-S38, 2017-S39, 2017-S40, 2017-S41, 2017-S42, 2017-S43, 2017-S44, 2017-S45, 2017-S46, 2017-S47, 2017-S48, 2017-S49, 2017-S50, 2017-S51, 2017-S52, 2017-S53 & 2017-S54 -- 2017 RZ15, 2017 RY15, 2017 RX15, 2017 RW15, 2017 RV15, 2017 RU15, 2017 RT15, 2017 RS15, 2017 RR15, 2017 RQ15, 2017 RP15, 2017 RO15, 2017 RN15, 2017 RM15, 2017 RL15, 2017 RK15, 2017 RJ15, 2017 RH15, 2017 RG15, 2017 RF15, 2017 RE15, 2017 RD15, 2017 RC15, 2017 RB16, 2017 RB15, 2017 RA16, 2017 RA14, 2017 PS30, 2017 NB7, 2017 HN3, 2013 SL30, 2012 TC4, 2011 EB7, 2010 JO179, 2006 UJ185, 2004 RY10, 2004 RE84, 2003 QW30, 2002 RP28, 2000 WL63, 96536, 52768, 447903, 419472, 411201, 410627, 407653, 403039, 378124, 350536, 333480, 138911, 8035, 2201
Z38Picoto Obs., 1 in MPEC 2017-S25 -- 20460
W25RMS Obs., 1 in MPEC 2017-S51 -- 2017 RY15
204Schiaparelli Obs. in Italy, 29 in MPEC 2017-S25 -- 2017 RX1, 2017 RW1, 2017 RV1, 2017 RU1, 2017 QY34, 2017 PJ26, 2017 OT18, 2017 OS18, 2017 OR19, 2017 OP68, 2017 OH7, 2017 OF7, 2017 KS4, 2017 KR31, 2017 KR27, 2017 KJ3, 2017 JU1, 2017 JL3, 2017 HN49, 2015 FO124, 2014 SR339, 2013 RE21, 2010 MW, 2001 NJ6, 496018, 486692, 482650, 481394, 3122
645Sloan Digital Sky Survey in New Mexico, 1 in MPEC 2017-S54 -- 2010 JO179
W88!program code "!" (10) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-S25 -- 2017 RG2
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-S25 -- 1998 SZ27
691Spacewatch 0.9m telescope in Arizona, 18 in MPECs 2017-S24, 2017-S25, 2017-S27, 2017-S28, 2017-S32, 2017-S35, 2017-S41, 2017-S44, 2017-S45, 2017-S46, 2017-S50, 2017-S51 & 2017-S52 -- 2017 RY15, 2017 RX15, 2017 RW15, 2017 RV15, 2017 RU15, 2017 RR15, 2017 RP2, 2017 RO2, 2017 RL15, 2017 RH15, 2017 RD15, 2017 RC15, 2017 RA14, 2017 QM18, 2017 QL35, 2017 MU7, 2014 HQ124, 2004 RE84
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2017-S25, 2017-S30, 2017-S33, 2017-S36, 2017-S38, 2017-S43 & 2017-S49 -- 2017 RT15, 2017 RO15, 2017 RM15, 2017 RJ15, 2017 RF15, 2017 RB16, 2017 QW17, 2017 NK
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-S25 -- 3122
W34Squirrel Valley Obs. in North Carolina, 3 in MPECs 2017-S23, 2017-S25 & 2017-S51 -- 2017 RY15, 2017 RV1, 2014 CD13
I52Steward Obs. Mt. Lemmon Station in Arizona, 17 in MPECs 2017-S23, 2017-S25, 2017-S27, 2017-S29, 2017-S31, 2017-S32, 2017-S35, 2017-S42, 2017-S44, 2017-S45, 2017-S46, 2017-S48, 2017-S50, 2017-S51 & 2017-S52 -- 2017 RY15, 2017 RX15, 2017 RX1, 2017 RW15, 2017 RV15, 2017 RU15, 2017 RS15, 2017 RL15, 2017 RH15, 2017 RG15, 2017 RE15, 2017 RC15, 2017 RA16, 2017 QE18, 2017 PB27, 2014 CD13, 2004 RE84
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2017-S25 -- 2017 RC
718Wiggins Obs. in Utah, 1 in MPEC 2017-S25 -- 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 RZ15JPL Sentry19102071-2117285.03571357e-05-5.66-6.000JPL: Computed at 11:15 today Pacific time based on 9 observations spanning 2.8111 days (2017-Sep-15.41445 to 2017-Sep-18.2255). Diameter approximately 0.013 km. from weighted mean H=27.15.
2017 RO2JPL Sentry1550R E M O V E DJPL: Risk listing removed at 1500 UTC today.
2017 RK2JPL Sentry15502083-208319.596e-07-7.72-7.720JPL: Computed at 07:54 today Pacific time based on 26 observations spanning 4.7042 days (2017-Sep-13.31727 to 2017-Sep-18.021436). Diameter approximately 0.009 km. from weighted mean H=28.01.
2017 RCJPL Sentry15502086-2117264.5377757e-05-6.07-6.500JPL: Computed at 08:03 today Pacific time based on 36 observations spanning 13.944 days (2017-Sep-01.38514 to 2017-Sep-15.329587). Diameter approximately 0.009 km. from weighted mean H=27.89.
2010 VR139JPL Sentry15502017-2076158.94367e-08-6.38-6.440JPL: Computed at 11:46 April 7th Pacific time based on 7 observations spanning .06429 days (2010-Nov-14.33679 to 2010-Nov-14.40108). Diameter approximately 0.015 km. from weighted mean H=26.71.
2006 UJ185JPL Sentry15502083-211492.502842e-05-6.14-6.380JPL: Computed at 08:27 today Pacific time based on 42 observations spanning 3977.2 days (2006-Oct-28.28933 to 2017-Sep-17.51067). Diameter approximately 0.009 km. from weighted mean H=27.90.

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 18 September '17

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

2358Grabbed MPEC 2017-S54 - 2010 JO179 - see above
2234Grabbed MPEC 2017-S53 - 2013 SL30 - see above
2012Generated Traffic Report
1910Noted that JPL Sentry has posted 2017 RZ15 as an impact risk - see above
1806Grabbed MPEC 2017-S52 - 2004 RE84 - see above
1630Grabbed MPEC 2017-S49 - 2017 RB16 - see above
Grabbed MPEC 2017-S50 - 2017 RW15 - see above
Grabbed MPEC 2017-S51 - 2017 RY15 - see above
1550Noted that JPL Sentry has updated its 2006 UJ185 risk assessment - see above
Noted that JPL Sentry has updated its 2010 VR139 risk assessment - see above
Noted that JPL Sentry has updated its 2017 RC risk assessment - see above
Noted that JPL Sentry has updated its 2017 RK2 risk assessment - see above
Noted that JPL Sentry has removed 2017 RO2 as an impact risk - see above
Grabbed MPEC 2017-S23 - 2014 CD13 - see above
Grabbed MPEC 2017-S24 - 2017 RA14 - see above
Grabbed MPEC 2017-S25 - Daily Orbit Update - see above
Grabbed MPEC 2017-S26 - 2017 RB15 - see above
Grabbed MPEC 2017-S27 - 2017 RC15 - see above
Grabbed MPEC 2017-S28 - 2017 RD15 - see above
Grabbed MPEC 2017-S29 - 2017 RE15 - see above
Grabbed MPEC 2017-S30 - 2017 RF15 - see above
Grabbed MPEC 2017-S31 - 2017 RG15 - see above
Grabbed MPEC 2017-S32 - 2017 RH15 - see above
Grabbed MPEC 2017-S33 - 2017 RJ15 - see above
Grabbed MPEC 2017-S34 - 2017 RK15 - see above
Grabbed MPEC 2017-S35 - 2017 RL15 - see above
Grabbed MPEC 2017-S36 - 2017 RM15 - see above
Grabbed MPEC 2017-S37 - 2017 RN15 - see above
Grabbed MPEC 2017-S38 - 2017 RO15 - see above
Grabbed MPEC 2017-S39 - 2017 RP15 - see above
Grabbed MPEC 2017-S40 - 2017 RQ15 - see above
Grabbed MPEC 2017-S41 - 2017 RR15 - see above
Grabbed MPEC 2017-S42 - 2017 RS15 - see above
Grabbed MPEC 2017-S43 - 2017 RT15 - see above
Grabbed MPEC 2017-S44 - 2017 RU15 - see above
Grabbed MPEC 2017-S45 - 2017 RV15 - see above
Grabbed MPEC 2017-S46 - 2017 RX15 - see above
Grabbed MPEC 2017-S47 - 2017 RZ15 - see above
Grabbed MPEC 2017-S48 - 2017 RA16 - see above
0335Grabbed MPEC 2017-S22 - 2015 VR1 - see above