Contents  on 17 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 17 September '17

Seven objects reported inside ten LD

Seven Solar-System small bodies, all newly announced, are reported to be inside ten lunar distances (LD) of our home world today. Nearest is 2017 RK2, which comes its closest to Earth this time around, reaching 2.45 LD at 2115 UTC.

Earth passage I D ~Size Distance Today  Notes
1.43 LD Sept. 152017 RJ2 11 m  4.05 to 7.49 LD NEW - MPEC
2.16 LD Sept. 122017 RV2 19 m  7.65 to 9.10 LD NEW - MPEC
2.45 LD today2017 RK2 8 m  2.45 LD NEW, Earth closest at 2115 UTC - MPEC
6.17 LD tomorrow2017 RX2 18 m  6.49 from 7.84 LD NEW - MPEC
6.44 LD Sept. 122017 RS2 19 m  8.00 to 8.61 LD NEW - MPEC
6.79 LD tomorrow2017 RU2 22 m  7.02 from 7.77 LD NEW - MPEC
7.86 LD Sept. 192017 RG2 44 m  8.55 from 9.46 LD NEW - MPEC
Approaching (sorted by 10-LD bubble entry date)
7.87 LD Sept. 291989 VB 389 m  < 10 LD Sept. 25, radar target - DOU
0.13 LD Oct. 122012 TC4 15 m  < 10 LD Oct. 5, intruder, radar/NHATS target, risk
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 updated at 2333 UTC with seven new discoveries, all in the accompanying active traffic table. Your first neighborhood asteroid traffic report was generated at 1510 UTC with follow-up in today's DOU MPEC for approaching 1989 VB and departed risk-listed 2017 RC.



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 17 September '17

The MPC's NEO Confirmation Page has 149 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 149 objects listed. Of these, 53 were "one nighters." So far The Tracking News has counted a total of 177 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 17 September '17

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been 20 MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2017-S21 - "16:26 UT" - 2017 RR2


MPEC 2017-S20 - "16:23 UT" - 2017 RK2


MPEC 2017-S19 - "16:20 UT" - 2017 RJ2


MPEC 2017-S18 - "16:17 UT" - 2017 SA


MPEC 2017-S17 - "16:13 UT" - 2017 RX2


MPEC 2017-S16 - "16:10 UT" - 2017 RW2


MPEC 2017-S15 - "16:07 UT" - 2017 RV2


MPEC 2017-S14 - "16:03 UT" - 2017 RU2


MPEC 2017-S13 - "15:55 UT" - 2017 RT2


MPEC 2017-S12 - "15:51 UT" - 2017 RS2


MPEC 2017-S11 - "15:47 UT" - 2017 RQ2


MPEC 2017-S10 - "15:43 UT" - 2017 RP2


MPEC 2017-S09 - "15:40 UT" - 2017 RO2


MPEC 2017-S08 - "15:36 UT" - 2017 RN2


MPEC 2017-S07 - "15:33 UT" - 2017 RM2


MPEC 2017-S06 - "15:29 UT" - 2017 RL2


MPEC 2017-S05 - "15:27 UT" - 2017 RG2


MPEC 2017-S04 - "14:51 UT" - 2010 PM10


<< DOU on 17 Sept. '17 >>  MPEC 2017-S03 - "12:04 UT" - Daily Orbit Update


MPEC 2017-S02 - "03:19 UT" - 2001 UQ163

Observers  on 17 September '17

A total of 52 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 4 in MPECs 2017-S05, 2017-S12, 2017-S14 & 2017-S15 -- 2017 RV2, 2017 RU2, 2017 RS2, 2017 RG2
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2017-S02, 2017-S11, 2017-S14, 2017-S15, 2017-S16, 2017-S17, 2017-S18, 2017-S19 & 2017-S21 -- 2017 SA, 2017 RX2, 2017 RW2, 2017 RV2, 2017 RU2, 2017 RR2, 2017 RQ2, 2017 RJ2, 2001 UQ163
T05ATLAS Haleakala in Hawaii, 7 in MPECs 2017-S03, 2017-S05, 2017-S12, 2017-S14 & 2017-S15 -- 2017 RV2, 2017 RU2, 2017 RS2, 2017 RG2, 326388, 220909, 3122
T08ATLAS Mauna Loa in Hawaii, 19 in MPECs 2017-S03, 2017-S05, 2017-S11 & 2017-S12 -- 2017 RS2, 2017 RQ2, 2017 RG2, 2017 QQ32, 2017 OP68, 2002 RP28, 96631, 85709, 66146, 53319, 414990, 411201, 190166, 141670, 138911, 5143, 3753, 3288, 1980
V03Big Water Obs. in Utah, 1 in MPEC 2017-S03 -- 143624
Q68Blue Mountains Obs. in New South Wales, 2 in MPEC 2017-S03 -- 1989 VB, 154589
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2017-S11 & 2017-S15 -- 2017 RV2, 2017 RQ2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2017-S02, 2017-S03, 2017-S06, 2017-S09 & 2017-S10 -- 2017 RP2, 2017 RO2, 2017 RL2, 2017 KR34, 2017 HR49, 2001 UQ163
850Cordell-Lorenz Obs. in Tennessee, 3 in MPECs 2017-S11, 2017-S12 & 2017-S15 -- 2017 RV2, 2017 RS2, 2017 RQ2
J27El Guijo Obs. in Spain, 7 in MPEC 2017-S03 -- 2017 PJ26, 2014 YC15, 2004 TQ13, 90075, 333888, 265962, 142464
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPECs 2017-S04, 2017-S05, 2017-S14 & 2017-S17 -- 2017 RX2, 2017 RU2, 2017 RG2, 2010 PM10
734Farpoint Obs. in Kansas, 1 in MPEC 2017-S09 -- 2017 RO2
W46Foxfire Village Obs., 1 in MPEC 2017-S03 -- 3122
203GiaGa Obs. in Italy, 1 in MPEC 2017-S19 -- 2017 RJ2
K88GINOP-KHK in Hungary, 3 in MPECs 2017-S12, 2017-S15 & 2017-S17 -- 2017 RX2, 2017 RV2, 2017 RS2
J95Great Shefford Obs. in England, 5 in MPECs 2017-S03, 2017-S12, 2017-S14, 2017-S15 & 2017-S19 -- 2017 RV2, 2017 RU2, 2017 RS2, 2017 RJ2, 2017 PY24
A17Guidestar Obs. in Germany, 2 in MPECs 2017-S11 & 2017-S15 -- 2017 RV2, 2017 RQ2
B15Inastars Obs. in Germany, 1 in MPEC 2017-S11 -- 2017 RQ2
H15ISON New Mexico Obs. in New Mexico, 5 in MPEC 2017-S03 -- 2017 RL, 2017 PJ26, 2014 YC15, 411201, 8035
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-S05 -- 2017 RG2
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 4 in MPECs 2017-S03, 2017-S11, 2017-S12 & 2017-S15 -- 2017 RV2, 2017 RS2, 2017 RQ2, 1989 VB
W19Kalamazoo Obs. in Michigan, 2 in MPEC 2017-S03 -- 90075, 3122
585Kiev Comet Station in Ukraine, 4 in MPECs 2017-S11, 2017-S14, 2017-S15 & 2017-S17 -- 2017 RX2, 2017 RV2, 2017 RU2, 2017 RQ2
Z43Landehen Obs., 6 in MPEC 2017-S03 -- 2014 YC15, 96631, 90075, 265962, 6053, 3122
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2017-S02 -- 2001 UQ163
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-S03 -- 85804
568_Marco Micheli on Mauna Kea in Hawaii, 8 in MPECs 2017-S06, 2017-S07, 2017-S09, 2017-S10, 2017-S13, 2017-S19, 2017-S20 & 2017-S21 -- 2017 RT2, 2017 RR2, 2017 RP2, 2017 RO2, 2017 RM2, 2017 RL2, 2017 RK2, 2017 RJ2
711McDonald Obs. in Texas, 2 in MPECs 2017-S02 & 2017-S11 -- 2017 RQ2, 2001 UQ163
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-S03 -- 2017 QA35
J69North Obs. in England, 2 in MPECs 2017-S11 & 2017-S15 -- 2017 RV2, 2017 RQ2
Z80Northolt Branch Obs. in England, 2 in MPECs 2017-S03 & 2017-S20 -- 2017 RV1, 2017 RK2
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2017-S15 -- 2017 RV2
F51Pan-STARRS 1 (PS1) in Hawaii, 26 in MPECs 2017-S02, 2017-S03, 2017-S05, 2017-S06, 2017-S07, 2017-S09, 2017-S10, 2017-S11, 2017-S13, 2017-S16, 2017-S17, 2017-S18, 2017-S19, 2017-S20 & 2017-S21 -- 2017 SA, 2017 RX2, 2017 RW2, 2017 RT2, 2017 RR2, 2017 RQ2, 2017 RP2, 2017 RO2, 2017 RM2, 2017 RL2, 2017 RK2, 2017 RJ2, 2017 RG2, 2017 QW32, 2017 QG33, 2017 CN1, 2015 QE9, 2004 EK1, 2001 UQ163, 455956, 399774, 332408, 17181, 162679, 141874, 137427
K63Pascoli Obs. in Italy, 1 in MPEC 2017-S11 -- 2017 RQ2
B49Paus Obs. in Spain, 3 in MPECs 2017-S11, 2017-S14 & 2017-S15 -- 2017 RV2, 2017 RU2, 2017 RQ2
W98Polonia Obs. in Chile, 1 in MPEC 2017-S03 -- 2017 MY3
J53Posadas Obs. in Spain, 1 in MPEC 2017-S03 -- 2014 YC15
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-S02 -- 2001 UQ163
W25RMS Obs., 5 in MPECs 2017-S02, 2017-S14, 2017-S15, 2017-S17 & 2017-S20 -- 2017 RX2, 2017 RV2, 2017 RU2, 2017 RK2, 2001 UQ163
L04ROASTERR-1 in Romania, 3 in MPECs 2017-S11, 2017-S12 & 2017-S15 -- 2017 RV2, 2017 RS2, 2017 RQ2
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2017-S19 -- 2017 RJ2
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2017-S09 & 2017-S11 -- 2017 RQ2, 2017 RO2
C95SATINO-1 in France, 1 in MPEC 2017-S20 -- 2017 RK2
204Schiaparelli Obs. in Italy, 3 in MPECs 2017-S14, 2017-S15 & 2017-S19 -- 2017 RV2, 2017 RU2, 2017 RJ2
Y00SONEAR in Brazil, 4 in MPECs 2017-S03, 2017-S05 & 2017-S15 -- 2017 RV2, 2017 RG2, 2017 OD1, 137799
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2017-S02, 2017-S09, 2017-S10, 2017-S15 & 2017-S16 -- 2017 RW2, 2017 RV2, 2017 RP2, 2017 RO2, 2001 UQ163
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2017-S07 & 2017-S13 -- 2017 RT2, 2017 RM2
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-S03 -- 3122
W34Squirrel Valley Obs. in North Carolina, 4 in MPECs 2017-S03, 2017-S11, 2017-S12 & 2017-S15 -- 2017 RV2, 2017 RS2, 2017 RQ2, 142464
I52Steward Obs. Mt. Lemmon Station in Arizona, 9 in MPECs 2017-S03, 2017-S06, 2017-S09, 2017-S10, 2017-S11, 2017-S12, 2017-S17 & 2017-S20 -- 2017 RX2, 2017 RS2, 2017 RQ2, 2017 RP2, 2017 RO2, 2017 RM1, 2017 RL2, 2017 RL1, 2017 RK2
T14UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 2 in MPECs 2017-S03 & 2017-S08 -- 2017 RN2, 2017 RC
C51WISE in Earth polar orbit, 2 in MPEC 2017-S03 -- 2017 HY50, 1989 VB
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 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 RX2JPL Sentry19022049-204919.794e-10-9.46-9.460JPL: Computed at 11:38 today Pacific time based on 25 observations spanning 1.7781 days (2017-Sep-15.45005 to 2017-Sep-17.22813). Diameter approximately 0.018 km. from weighted mean H=26.43.
2017 RV2JPL Sentry19022082-2117400.000110842843-4.92-5.720JPL: Computed at 11:02 today Pacific time based on 98 observations spanning 3.0707 days (2017-Sep-14.43497 to 2017-Sep-17.50564). Diameter approximately 0.019 km. from weighted mean H=26.20.
2017 RU2JPL Sentry19022093-209313.384e-07-7.21-7.210JPL: Computed at 10:51 today Pacific time based on 34 observations spanning 2.5177 days (2017-Sep-14.41954 to 2017-Sep-16.937226). Diameter approximately 0.022 km. from weighted mean H=25.90.
2017 RO2NEODyS2301209211.11e-11-9.78-9.780NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2017-09-13.433 to 2017-09-17.258."
JPL Sentry19022048-2111129.18571e-08-5.62-5.910JPL: Computed at 10:57 today Pacific time based on 33 observations spanning 3.8256 days (2017-Sep-13.43198 to 2017-Sep-17.25754). Diameter approximately 0.130 km. from weighted mean H=22.13.
2017 RK2JPL Sentry19022083-208311.802e-06-7.46-7.460JPL: Computed at 10:50 today Pacific time based on 21 observations spanning 3.9622 days (2017-Sep-13.31727 to 2017-Sep-17.27948). Diameter approximately 0.008 km. from weighted mean H=28.04.
2017 RJ2JPL Sentry19022108-211171.85419e-06-7.07-7.380JPL: Computed at 10:52 today Pacific time based on 26 observations spanning 2.7566 days (2017-Sep-12.31571 to 2017-Sep-15.072295). Diameter approximately 0.011 km. from weighted mean H=27.48.
2017 RCNEODyS23012084-2117533.86e-05-6.14-6.530NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2017-09-01.386 to 2017-09-14.377."
JPL Sentry15002086-2117274.0777964e-05-6.12-6.600JPL: Computed at 07:59 today Pacific time based on 33 observations spanning 12.991 days (2017-Sep-01.38514 to 2017-Sep-14.375866). Diameter approximately 0.009 km. from weighted mean H=27.90.
2012 TC4NEODyS23012050-2112812.28e-03-3.55-3.620NEODyS: "Based on 285 optical observations (of which 1 are rejected as outliers) from 2012-10-04.468 to 2017-09-14.447."

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 17 September '17

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

2333Updated Traffic Report
2301Noted that NEODyS has updated its 2012 TC4 risk assessment - see above
Noted that NEODyS has updated its 2017 RC risk assessment - see above
Noted that NEODyS has posted 2017 RO2 as an impact risk - see above
1902Noted that JPL Sentry has posted 2017 RJ2 as an impact risk - see above
Noted that JPL Sentry has posted 2017 RK2 as an impact risk - see above
Noted that JPL Sentry has posted 2017 RO2 as an impact risk - see above
Noted that JPL Sentry has posted 2017 RU2 as an impact risk - see above
Noted that JPL Sentry has posted 2017 RV2 as an impact risk - see above
Noted that JPL Sentry has posted 2017 RX2 as an impact risk - see above
Grabbed MPEC 2017-S13 - 2017 RT2 - see above
Grabbed MPEC 2017-S14 - 2017 RU2 - see above
Grabbed MPEC 2017-S15 - 2017 RV2 - see above
Grabbed MPEC 2017-S16 - 2017 RW2 - see above
Grabbed MPEC 2017-S17 - 2017 RX2 - see above
Grabbed MPEC 2017-S18 - 2017 SA - see above
Grabbed MPEC 2017-S19 - 2017 RJ2 - see above
Grabbed MPEC 2017-S20 - 2017 RK2 - see above
Grabbed MPEC 2017-S21 - 2017 RR2 - see above
1600Grabbed MPEC 2017-S06 - 2017 RL2 - see above
Grabbed MPEC 2017-S07 - 2017 RM2 - see above
Grabbed MPEC 2017-S08 - 2017 RN2 - see above
Grabbed MPEC 2017-S09 - 2017 RO2 - see above
Grabbed MPEC 2017-S10 - 2017 RP2 - see above
Grabbed MPEC 2017-S11 - 2017 RQ2 - see above
Grabbed MPEC 2017-S12 - 2017 RS2 - see above
1530Grabbed MPEC 2017-S05 - 2017 RG2 - see above
1500Noted that JPL Sentry has updated its 2017 RC risk assessment - see above
Grabbed MPEC 2017-S03 - Daily Orbit Update - see above
Grabbed MPEC 2017-S04 - 2010 PM10 - see above
0400Grabbed MPEC 2017-S02 - 2001 UQ163 - see above