Contents  on 28 May '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 28 May '17

Five objects reported inside ten LD

Today five asteroids are reported flying within ten lunar distances (LD) of Earth. The two closest are actually leaving our reporting "bubble": risk-listed 2017 KH5 travels out from 7.83 to 11.13 LD and 2017 KW4 from 7.89 to 10.53 LD. And, at similar distances, radar target 2017 CS moves in from 8.62 to 8.04 LD, 2017 HU49 is outbound from 8.38 to 8.66 LD, and new discovery 2017 KJ27 enters the bubble, sliding in from 11.38 to 8.52 LD.

Coming around the Sun next, radar target 418094 2007 WV4 arrives inside the bubble on May 31st, followed by two newly announced objects: risk-listed 2017 KQ27 on June 2nd and 2017 KR27 on the 3rd.

This report was generated at 1940 UTC with new discoveries 2017 KR27 (MPEC), 2017 KJ27 (MPEC), departed 2017 KN27 (MPEC, DOU), which flew past us at 5.22 LD on May 23rd, and, announced late yesterday, 2017 KQ27 (MPEC) and departed 2017 KP27 (MPEC), which went by at 8.03 LD on May 4th. Today's DOU MPEC has follow-up for 2017 HU49, 2017 CS, and departed 2017 KY4.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical importance but is a useful boundary for reporting on transient natural objects that approach the actually significant 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 28 May '17

The MPC's NEO Confirmation Page has 56 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 56 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 64 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 28 May '17

Minor Planet Electronic Circulars

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


MPEC 2017-K74 - "13:38 UT" - 2015 TN178


<< DOU on 28 May '17 >>  MPEC 2017-K73 - "12:02 UT" - Daily Orbit Update


MPEC 2017-K72 - "04:03 UT" - Comet P/2016 WM48 (Lemmon)


MPEC 2017-K71 - "00:33 UT" - 2017 KJ27


MPEC 2017-K70 - "00:00 UT" - 2017 KR27

Observers  on 28 May '17

A total of 59 observers appear in today's MPECs.

CodeObserver / observatory
K40Altdorf Obs. in Germany, 1 in MPEC 2017-K73 -- 2017 CS
J57Alto Turia Obs. in Spain, 1 in MPEC 2017-K72 -- P/2016 WM48
E23Arcadia Obs. in New South Wales, 1 in MPEC 2017-K70 -- 2017 KR27
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2017-K73 -- 2005 GL9, 190166, 12538, 100926, 5653, 5604, 1917
T08ATLAS Mauna Loa in Hawaii, 6 in MPEC 2017-K73 -- 2013 CL118, 222073, 163696, 11398, 7888, 2329
C77Bernezzo Obs. in Italy, 1 in MPEC 2017-K72 -- P/2016 WM48
V03Big Water Obs. in Utah, 1 in MPEC 2017-K73 -- 161999
300Bisei Spaceguard Center in Japan, 1 in MPEC 2017-K72 -- P/2016 WM48
160Castelmartini Obs. in Italy, 4 in MPECs 2017-K71 & 2017-K73 -- 2017 KJ27, 252091, 3352, 2329
703Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2017-K71 & 2017-K73 -- 2017 KJ27, 2017 JL3, 2014 KF91, 96631, 68063, 20460, 136923, 5660, 1980
107Cavezzo Obs. in Italy, 1 in MPEC 2017-K70 -- 2017 KR27
K51Celado Obs. in Italy, 1 in MPEC 2017-K72 -- P/2016 WM48
807>Marco Micheli via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2017-K73 -- 2016 NL56
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2017-K73 -- 2017 KN4, 2017 KJ3, 2017 KD3, 2017 JW1, 2017 HU49, 2017 HH49
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2017-K72 -- P/2016 WM48
958Dax Obs. in France, 1 in MPEC 2017-K72 -- P/2016 WM48
K87Dettelbach Vineyard Obs., 1 in MPEC 2017-K73 -- 222073
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2017-K71 & 2017-K73 -- 2017 KJ27, 2017 KB3
F65(program code "(" (17) via Faulkes Telescope North in Hawaii, 1 in MPEC 2017-K72 -- P/2016 WM48
157Frasso Sabino Obs. in Italy, 1 in MPEC 2017-K73 -- 2017 GQ6
203GiaGa Obs. in Italy, 2 in MPECs 2017-K71 & 2017-K72 -- 2017 KJ27, P/2016 WM48
K88GINOP-KHK in Hungary, 1 in MPEC 2017-K71 -- 2017 KJ27
K73Gravina Obs. in Italy, 1 in MPEC 2017-K73 -- 6063
J95Great Shefford Obs. in England, 4 in MPECs 2017-K70, 2017-K71, 2017-K72 & 2017-K73 -- 2017 KR27, 2017 KN27, 2017 KJ27, P/2016 WM48
I67Hartley Wintney Obs. in England, 1 in MPEC 2017-K72 -- P/2016 WM48
511Haute Provence Obs. in Germany, 2 in MPECs 2017-K72 & 2017-K73 -- P/2016 WM48, 100926
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2017-K72 -- P/2016 WM48
U695Hidetaka Sato in Japan via iTelescope Obs. Auberry in northern California, 1 in MPEC 2017-K72 -- P/2016 WM48
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2017-K72 -- P/2016 WM48
Q62|Sergio Foglia in Italy via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2017-K72 -- P/2016 WM48
K38M57 Obs. in Italy, 3 in MPECs 2017-K72 & 2017-K73 -- P/2016 WM48, 90075, 6063
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2017-K70 & 2017-K71 -- 2017 KR27, 2017 KJ27
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2017-K74 -- 2015 TN178
118Modra Obs. in Slovakia, 2 in MPECs 2017-K71 & 2017-K73 -- 2017 KJ27, 2329
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2017-K71, 2017-K72 & 2017-K73 -- 2017 KJ27, 2017 FQ64, P/2016 WM48, 434188, 374038, 5653
C47Nonndorf Obs. in Austria, 1 in MPEC 2017-K73 -- 2017 CS
J69North Obs. in England, 1 in MPEC 2017-K72 -- P/2016 WM48
Z80Northolt Branch Obs. in England, 5 in MPEC 2017-K73 -- 2017 CS, 66391, 475665, 163696, 11398
C23Olmen Obs. in Belgium, 1 in MPEC 2017-K73 -- 66391
F51Pan-STARRS 1 (PS1) in Hawaii, 27 in MPECs 2017-K72, 2017-K73 & 2017-K74 -- 2017 KP4, 2017 KK3, 2017 GW6, 2017 DB109, P/2016 WM48, 2016 NL56, 2016 LJ49, 2015 TN178, 2015 GG1, 2014 VN6, 2013 JM7, 2013 BR45, 2012 VO76, 2011 OC18, 2006 KA40, 484795, 477519, 475665, 361518, 276891, 265962, 243298, 243025, 153951, 152964, 4503, 1980
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2017-K72 -- P/2016 WM48
122Pises Obs. in France, 4 in MPEC 2017-K73 -- 2015 ME54, 456651, 39796, 222073
D29Purple Mtn. Obs. Xuyi Station in China, 13 in MPECs 2017-K70 & 2017-K73 -- 2017 KR27, 2017 DS35, 2016 LJ49, 2014 SO143, 2014 KF91, 2013 BR45, 475665, 190166, 136923, 100926, 7888, 5626, 4581
W25RMS Obs., 1 in MPEC 2017-K71 -- 2017 KJ27
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2017-K72 -- P/2016 WM48
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2017-K70, 2017-K71 & 2017-K73 -- 2017 KR27, 2017 KN27, 2017 KJ27
H36Sandlot Obs. in Kansas, 2 in MPECs 2017-K70 & 2017-K72 -- 2017 KR27, P/2016 WM48
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2017-K72 -- P/2016 WM48
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-K72 -- P/2016 WM48
587Sormano Obs. in Italy, 1 in MPEC 2017-K72 -- P/2016 WM48
G45Space Surveillance Telescope Atom Site in New Mexico, 1 in MPEC 2017-K72 -- P/2016 WM48
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2017-K73 -- 2017 HK1, 2017 FQ64, 2017 FP64, 2013 RD32, 2009 WO106, 164202, 2329
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2017-K73 -- 2017 AP20
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2017-K71 & 2017-K72 -- 2017 KJ27, P/2016 WM48
I52Steward Obs. Mt. Lemmon Station in Arizona, 10 in MPECs 2017-K70, 2017-K71, 2017-K72 & 2017-K73 -- 2017 KY4, 2017 KX4, 2017 KS4, 2017 KR27, 2017 KP4, 2017 KN4, 2017 KJ27, 2017 KA5, 2017 JF3, P/2016 WM48
926Tenagra II Obs. in Arizona, 5 in MPECs 2017-K71, 2017-K72 & 2017-K73 -- 2017 KX4, 2017 KS4, 2017 KJ27, 2017 KD3, P/2016 WM48
W33Transit Dreams Obs., 4 in MPEC 2017-K73 -- 2017 CS, 90075, 190166, 6063
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-K73 -- 2017 CH1, 469219
K17Valentines Obs., 3 in MPEC 2017-K73 -- 416584, 100926, 1917
C51WISE in Earth polar orbit, 4 in MPECs 2017-K72 & 2017-K73 -- 2017 FJ90, P/2016 WM48, 474179, 2329
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 May '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 KQ27NEODyS21012048-211774.0e-06-5.69-5.780NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2017-05-25.305 to 2017-05-27.193."
JPL Sentry02152048-210853.58688e-06-5.75-5.890JPL: Computed at 18:51 May 27th Pacific time based on 12 observations spanning 1.8876 days (2017-May-25.30459 to 2017-May-27.192222). Diameter approximately 0.025 km. from weighted mean H=25.68.
2017 KB3NEODyS21012084-2117234.93e-07-6.52-6.950NEODyS #2 for the day: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2017-05-17.219 to 2017-05-27.980."
JPL Sentry15452080-2115235.2089957e-06-5.49-6.000JPL: Computed at 08:04 today Pacific time based on 35 observations spanning 10.761 days (2017-May-17.21791 to 2017-May-27.979163). Diameter approximately 0.036 km. from weighted mean H=24.88.
2017 HZ4NEODyS01012068-2115281.06e-04-4.75-4.760NEODyS: "Based on 47 optical observations (of which 1 are rejected as outliers) from 2017-04-26.445 to 2017-05-25.380."
2016 NL56JPL Sentry19052019-21173161.6894451e-06-3.78-4.670JPL: Computed at 10:06 today Pacific time based on 12 observations spanning 2.7820 days (2016-Jul-12.443828 to 2016-Jul-15.225848). Diameter approximately 0.168 km. from weighted mean H=21.62.

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 28 May '17

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

2101Noted that NEODyS has updated its 2017 KB3 risk assessment - see above
Noted that NEODyS has posted 2017 KQ27 as an impact risk - see above
1940Generated Traffic Report
1905Noted that JPL Sentry has updated its 2016 NL56 risk assessment - see above
1545Noted that JPL Sentry has updated its 2017 KB3 risk assessment - see above
Grabbed MPEC 2017-K73 - Daily Orbit Update - see above
Grabbed MPEC 2017-K74 - 2015 TN178 - see above
0431Grabbed MPEC 2017-K72 - Comet P/2016 WM48 (Lemmon) - see above
0215Noted that JPL Sentry has posted 2017 KQ27 as an impact risk - see above
0101Noted that NEODyS has updated its 2017 HZ4 risk assessment - see above
Noted that NEODyS has updated its 2017 KB3 risk assessment - see above
Grabbed MPEC 2017-K71 - 2017 KJ27 - see above
0022Grabbed MPEC 2017-K70 - 2017 KR27 - see above