Contents  on 21 November '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 21 November '17

Eleven objects reported inside ten LD

Eleven asteroids are known to be within ten lunar distances (LD) of Earth today. Nearest by far is newly announced risk-listed 2017 WW1, a tiny intruder that has come in from 2.29 LD at day's beginning to pass us at 0.37 LD at 1917 UTC. At the end of the day it will still be less than one LD from our planet and the Moon.

Earth passage I D ~Size Distance Today  Notes
0.37 LD today2017 WW1 4 m  0.37 LD NEW, intruder today, Earth closest
at 1917 UTC, risk - MPEC, DOU
1.25 LD Nov. 182017 VC14 7 m  7.44 to 9.91 LD risk
1.86 LD Nov. 152017 VV12 9 m  8.00 to 9.41 LD risk
1.98 LD yesterday2017 WB1 10 m  2.05 to 3.28 LD exits Earth SOI - DOU
2.02 LD Nov. 252017 VY13 17 m  9.37 from 11.69 LD enters ten LD
2.58 LD today2017 WV1 7 m  2.58 LD NEW Earth closest at 0624 UTC - MPEC
2.94 LD yesterday2017 WC 22 m  3.30 to 4.35 LD
3.01 LD Nov. 182017 WU1 15 m  5.00 to 6.41 LD DOU
3.18 LD Nov. 242017 VZ14 35 m  5.66 from 7.30 LD DOU
6.16 LD Nov. 182017 VN2 11 m  6.68 to 7.17 LD risk
8.04 LD tomorrow2017 VA15 34 m  8.10 from 8.40 LD

This report was generated at 1917 UTC with three discoveries seen in the above and below active traffic tables (2017 WH2, 2017 WW1, and 2017 WV1), plus already departed 2017 WO2 (MPEC), which went by us at about 2.6 LD on November 11th. Today's DOU MPEC has follow-up for three objects active in the above table and five departed objects: 2017 WB, 2017 VL1, 2017 VD, 171576 1999 VP11, and 496817 1989 VB.

Approaching (sorted by 10-LD bubble entry date)
3.8   LD Dec. 32008 WM61 15 m  < 10 LD Nov. 24, uncertainty +/- 2.985 days, NHATS target
7.76 LD Nov. 282017 WK1 14 m  < 10 LD Nov. 24
6.4   LD Nov. 302017 WH2 44 m  < 10 LD Nov. 28, NEW, uncertainty +/- 17 mins. - MPEC
9.71 LD Dec. 142015 XX169 11 m  < 10 LD Dec. 12, NHATS target
3.8   LD Dec. 172017 VT14 98 m  < 10 LD Dec. 13, uncertainty +/- 2.5667 hours, risk, comet nucleus?
6.5   LD Dec. 202006 XY 54 m  < 10 LD Dec. 13, uncertainty +/- 2.430 days, NHATS target
3.7   LD Feb. 242017 DR109 10 m  < 10 LD Feb. 18, uncertainty +/- 30 mins., NHATS target
3.8   LD March 72017 VR12 276 m  < 10 LD Feb. 28, uncertainty +/- 5.8333 hours

Reading:  Today NASA/JPL has posted a news item about 1I/`Oumuamua (A/2017 U1) commenting about how it appears to be "up to one-quarter mile (400 meters) long and highly-elongated-perhaps 10 times as long as it is wide [while the] most elongated objects [asteroid or comet from our solar system] we have seen to date are no more than three times longer than they are wide." The item says the Hubble and Spitzer space telescopes are tracking the object this week and "Observations from large ground-based telescopes will continue until the object becomes too faint to be detected, sometime after mid-December." JPL also has put up an Interstellar Asteroid FAQs page.
        On a much different topic, NASA/JPL reports "that NASA is making progress with regard to detection of objects that pose the greatest risk if they were to collide with Earth, but there are still many more to be found."



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.

Radar Astrometry  on 21 November '17

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2358 UTC when the database was dated 21 Nov.

NEOCP Activity  on 21 November '17

The MPC's NEO Confirmation Page has 89 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 89 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 110 listings on the NEOCP today.

New MPECs  on 21 November '17

Minor Planet Electronic Circulars

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


MPEC 2017-W105 - "15:28 UT" - 2017 WF2


MPEC 2017-W104 - "15:24 UT" - 2017 WO2


MPEC 2017-W103 - "15:20 UT" - 2017 WN2


MPEC 2017-W102 - "15:15 UT" - 2017 WM2


MPEC 2017-W101 - "15:09 UT" - 2017 WL2


MPEC 2017-W100 - "15:04 UT" - 2017 WK2


MPEC 2017-W99 - "14:58 UT" - 2017 WJ2


MPEC 2017-W98 - "14:52 UT" - 2017 WH2


MPEC 2017-W97 - "14:45 UT" - 2017 WG2


MPEC 2017-W96 - "14:38 UT" - 2017 WE2


<< DOU on 21 Nov. '17 >>  MPEC 2017-W95 - "13:06 UT" - Daily Orbit Update


MPEC 2017-W94 - "11:35 UT" - 2017 WW1


MPEC 2017-W93 - "11:21 UT" - 2017 WV1

Observers  on 21 November '17

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2017-W93, 2017-W97, 2017-W99, 2017-W100, 2017-W102 & 2017-W105 -- 2017 WV1, 2017 WM2, 2017 WK2, 2017 WJ2, 2017 WG2, 2017 WF2
T08ATLAS Mauna Loa in Hawaii, 21 in MPEC 2017-W95 -- 2017 VZ14, 2017 VX14, 2017 VM2, 2006 VW2, 1998 WP7, 85839, 505178, 500749, 496817, 495858, 415029, 22753, 21374, 19764, 162273, 140158, 136849, 9950, 8037, 2368, 1980
069Baldone Obs. in Latvia, 1 in MPEC 2017-W95 -- 2017 SO17
160Castelmartini Obs. in Italy, 11 in MPEC 2017-W95 -- 2017 VZ14, 2017 VM2, 2014 YC15, 1998 WP7, 505178, 504680, 500749, 497176, 496005, 333888, 21374
703Catalina Sky Survey (CSS) in Arizona, 32 in MPEC 2017-W95 -- 2017 WB, 2017 VD2, 2017 VC2, 2017 PS30, 2010 SA12, 2005 XB1, 53319, 53110, 505169, 496818, 495959, 483560, 448628, 438430, 403039, 374038, 338292, 333908, 25330, 192563, 190166, 171576, 16657, 159399, 154988, 154589, 141670, 138852, 137199, 11405, 7336, 1865
K51Celado Obs. in Italy, 2 in MPECs 2017-W93 & 2017-W95 -- 2017 WV1, 2017 WL1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPECs 2017-W95, 2017-W101 & 2017-W102 -- 2017 WM2, 2017 WL2, 2017 VV1, 2017 VC13, 2017 UQ4, 2017 UP44, 2017 UM43, 2017 SW20, 2017 SD14, 2017 RP2, 2017 RK1, 2017 QV34
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-W95 -- 2017 VM2
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2017-W96 -- 2017 WE2
006Fabra Obs. in Spain, 1 in MPEC 2017-W95 -- 99907
734Farpoint Obs. in Kansas, 3 in MPECs 2017-W96, 2017-W99 & 2017-W105 -- 2017 WJ2, 2017 WF2, 2017 WE2
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2017 WC
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2017-W95 -- 2017 VZ14
511Haute Provence Obs. in Germany, 1 in MPEC 2017-W95 -- 2017 VT12
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-W95 -- 85628
P93JAXA Space Tracking & Communications Center in Japan, 1 in MPEC 2017-W95 -- 2017 SO17
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2017-W93, 2017-W94, 2017-W100 & 2017-W101 -- 2017 WW1, 2017 WV1, 2017 WL2, 2017 WK2
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2017-W103, 2017-W104 & 2017-W105 -- 2017 WO2, 2017 WN2, 2017 WF2
474Mt. John Obs. in New Zealand, 1 in MPECs 2017-W94 & 2017-W95 -- 2017 WW1
G96Mt. Lemmon Survey (MLS) in Arizona, 39 in MPECs 2017-W93, 2017-W94, 2017-W95, 2017-W100 & 2017-W101 -- 2017 WW1, 2017 WV1, 2017 WL2, 2017 WK2, 2017 WB, 2017 UR7, 2017 QL33, 2017 PS30, 2017 PC27, 2017 OH68, 2017 OD1, 2017 MV2, 2015 SA17, 2000 DQ110, 96536, 85709, 65679, 456651, 439898, 438430, 416584, 408792, 407653, 378124, 374038, 333908, 242211, 225416, 16657, 162215, 154589, 141670, 138852, 10115, 7977, 7336, 5143, 3288, 1865
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2017-W95 -- 2368
F51Pan-STARRS 1 (PS1) in Hawaii, 29 in MPECs 2017-W95, 2017-W96, 2017-W97, 2017-W98, 2017-W99, 2017-W102, 2017-W103, 2017-W104 & 2017-W105 -- 2017 WO2, 2017 WN2, 2017 WM2, 2017 WJ2, 2017 WH2, 2017 WG2, 2017 WF2, 2017 WE2, 2017 VZ14, 2017 VN15, 2017 VD, 2017 UO, 2017 QT35, 1998 WP7, 96590, 68278, 67367, 504711, 480922, 438430, 363505, 329669, 30825, 219527, 159399, 155341, 154268, 153814, 136839
K63Pascoli Obs. in Italy, 1 in MPEC 2017-W93 -- 2017 WV1
Z38Picoto Obs., 1 in MPEC 2017-W95 -- 88188
L04ROASTERR-1 in Romania, 1 in MPEC 2017-W95 -- 2017 WU1
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2017-W95 -- 194268
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-W95 -- 2017 VT13
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2017-W97, 2017-W98, 2017-W103 & 2017-W104 -- 2017 WO2, 2017 WN2, 2017 WH2, 2017 WG2
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2017-W94, 2017-W95, 2017-W102 & 2017-W103 -- 2017 WW1, 2017 WN2, 2017 WM2, 2017 VS13, 2017 VL1
V78Spirit Marsh Obs. in Minnesota, 2 in MPEC 2017-W95 -- 3200, 3122
I52Steward Obs. Mt. Lemmon Station in Arizona, 10 in MPECs 2017-W93, 2017-W94, 2017-W95, 2017-W96, 2017-W97, 2017-W99, 2017-W100, 2017-W101 & 2017-W104 -- 2017 WW1, 2017 WV1, 2017 WP, 2017 WO2, 2017 WL2, 2017 WK2, 2017 WJ2, 2017 WG2, 2017 WE2, 2017 WB
926Tenagra II Obs. in Arizona, 8 in MPECs 2017-W95, 2017-W96, 2017-W97, 2017-W98, 2017-W100, 2017-W101, 2017-W102 & 2017-W104 -- 2017 WO2, 2017 WM2, 2017 WL2, 2017 WK2, 2017 WH2, 2017 WG2, 2017 WE2, 2017 WB1
C51WISE in Earth polar orbit, 9 in MPEC 2017-W95 -- 2017 VH2, 2017 UZ42, 2017 QV34, 2002 RN38, 96590, 505169, 162011, 154988, 11500
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 November '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 WW1JPL Sentry17002055-205513.082e-08-9.64-9.640JPL: Computed at 08:01 today Pacific time based on 25 observations spanning 1.1444 days (2017-Nov-20.31298 to 2017-Nov-21.457332). Diameter approximately 0.004 km. from weighted mean H=29.72.
2017 VC14NEODyS1700211211.95e-08-9.65-9.650NEODyS: "Based on 44 optical observations (of which 8 are rejected as outliers) from 2017-11-15.247 to 2017-11-18.396."
2017 VL2NEODyS17002087-2115312.34e-05-5.50-5.710NEODyS: "Based on 48 optical observations (of which 1 are rejected as outliers) from 2017-11-10.476 to 2017-11-19.646."
2017 VJNEODyS17002094-2117237.15e-07-6.21-6.940NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2017-11-05.412 to 2017-11-20.332."

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 21 November '17

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

2358Noted Radar Astrometry database update - see above
1917Generated Traffic Report
1700Noted that NEODyS has updated its 2017 VC14 risk assessment - see above
Noted that NEODyS has updated its 2017 VJ risk assessment - see above
Noted that NEODyS has updated its 2017 VL2 risk assessment - see above
Noted that JPL Sentry has posted 2017 WW1 as an impact risk - see above
Grabbed MPEC 2017-W93 - 2017 WV1 - see above
Grabbed MPEC 2017-W94 - 2017 WW1 - see above
Grabbed MPEC 2017-W95 - Daily Orbit Update - see above
Grabbed MPEC 2017-W96 - 2017 WE2 - see above
Grabbed MPEC 2017-W97 - 2017 WG2 - see above
Grabbed MPEC 2017-W98 - 2017 WH2 - see above
Grabbed MPEC 2017-W99 - 2017 WJ2 - see above
Grabbed MPEC 2017-W100 - 2017 WK2 - see above
Grabbed MPEC 2017-W101 - 2017 WL2 - see above
Grabbed MPEC 2017-W102 - 2017 WM2 - see above
Grabbed MPEC 2017-W103 - 2017 WN2 - see above
Grabbed MPEC 2017-W104 - 2017 WO2 - see above
Grabbed MPEC 2017-W105 - 2017 WF2 - see above