Contents  on 19 June '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 19 June '17

Two objects reported inside ten LD

Today there are two known transient natural objects less than ten lunar distances (LD) from Earth. Within our planet's SOI (sphere of gravitational influence), newly announced 2017 MF comes its closest to Earth on this passage, reaching 1.02 LD at 2232 UTC. And, much further away, 2017 LV is outbound from 6.91 to 7.65 LD. On approach next, radar target 441987 2010 NY65 enters ten LD on June 22nd and NHATS target 2017 BS5 arrives on July 16th.

This report was generated at 1818 UTC with the discovery of 2017 MF announced late yesterday (MPEC, DOU), and with follow-up in today's DOU MPEC for 2017 LV and for departed objects 2017 MD, 2017 LX, and radar targets 2017 CS and 418094 2007 WV4, plus distant 484402 2007 XH16.



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. "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 19 June '17

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, eight were "one nighters."

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 19 June '17

Minor Planet Electronic Circulars

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


<< DOU on 19 June '17 >>  MPEC 2017-M27 - "12:00 UT" - Daily Orbit Update


MPEC 2017-M26 - "02:12 UT" - 2015 RY245


MPEC 2017-M25 - "02:09 UT" - 2015 RX245


MPEC 2017-M24 - "02:07 UT" - 2015 KH163


MPEC 2017-M23 - "02:04 UT" - 2015 KG163


MPEC 2017-M22 - "02:02 UT" - 2015 GT50


MPEC 2017-M21 - "01:59 UT" - 2013 UT15

Observers  on 19 June '17

A total of 28 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPEC 2017-M27 -- 2017 LA, 2017 KP4, 2017 HY50, 2017 HW48, 2017 HN3, 2017 DS35, 2017 CS, 2011 ED78, 2003 MT, 190166, 136923, 11398, 106589, 7888, 6063, 2102, 1980, 1917
B66Casasco Obs. in Italy, 3 in MPEC 2017-M27 -- 66391, 494706, 190166
160Castelmartini Obs. in Italy, 18 in MPEC 2017-M27 -- 2017 CS, 2011 ED78, 68950, 68348, 52750, 495331, 484402, 416584, 232368, 190166, 142040, 141056, 100926, 7888, 6063, 5660, 2102, 1917
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2017-M27 -- 2014 SZ303, 2007 ML6, 96631, 68348, 488494, 20460, 136923, 136818, 1980
K65Cesena Obs. in Italy, 1 in MPEC 2017-M27 -- 2017 ME
K87Dettelbach Vineyard Obs., 1 in MPEC 2017-M27 -- 2017 MC
157Frasso Sabino Obs. in Italy, 1 in MPEC 2017-M27 -- 142040
K88GINOP-KHK in Hungary, 2 in MPEC 2017-M27 -- 2007 ML6, 494706
J95Great Shefford Obs. in England, 2 in MPEC 2017-M27 -- 2017 LV, 2017 LO1
A17Guidestar Obs. in Germany, 1 in MPEC 2017-M27 -- 2017 MC
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2017-M27 -- 2017 ME
K38M57 Obs. in Italy, 1 in MPEC 2017-M27 -- 2017 ME
W92MASTER OAFA Obs., 1 in MPEC 2017-M27 -- 154589
K95MASTER-II Sutherland in South Africa, 1 in MPEC 2017-M27 -- 4954
568{JJ Kavelaars on Mauna Kea in Hawaii, 6 in MPECs 2017-M21, 2017-M22, 2017-M23, 2017-M24, 2017-M25 & 2017-M26 -- 2015 RY245, 2015 RX245, 2015 KH163, 2015 KG163, 2015 GT50, 2013 UT15
474Mt. John Obs. in New Zealand, 1 in MPEC 2017-M27 -- 2016 WZ1
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPEC 2017-M27 -- 2017 LC, 2010 VB1, 2007 ML6, 53430, 495222, 418094, 333908, 11398
K74Muensterschwarzach Obs. in Germany, 6 in MPEC 2017-M27 -- 2017 CS, 495331, 190166, 6063, 2102, 1980
A53Peschiera del Garda Obs. in Italy, 4 in MPEC 2017-M27 -- 2017 MA, 2017 HW48, 2017 CS, 494706
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2017-M27 -- 475665, 142781, 1980
W25RMS Obs., 3 in MPEC 2017-M27 -- 2017 LW, 142561, 142040
204Schiaparelli Obs. in Italy, 1 in MPEC 2017-M27 -- 2017 LX
Y00SONEAR in Brazil, 3 in MPEC 2017-M27 -- 2017 MF, 2008 NU, 138846
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2017-M27 -- 2017 MD, 2017 KL3, 2017 BG85, 2014 HR184, 2013 MR, 1995 LG, 437841
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2017-M27 -- 2017 JF3, 2017 HT2, 2017 AQ19, 2008 EL6, 2004 QD20, 2003 QW30, 2002 XU4, 2002 GP186, 162183
I52Steward Obs. Mt. Lemmon Station in Arizona, 12 in MPEC 2017-M27 -- 2017 LF1, 2017 LE1, 2017 KV31, 2017 KP4, 2017 KO4, 2017 KN4, 2017 BM31, 2017 BG85, 2016 VS5, 442559, 436771, 420210
926Tenagra II Obs. in Arizona, 1 in MPEC 2017-M27 -- 416584
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-M27 -- 2017 KJ5, 2016 HL3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 June '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 LO1JPL Sentry17062019-2116862.227521e-07-2.89-3.650JPL #2 for the day: Computed at 09:46 today Pacific time based on 35 observations spanning 4.6663 days (2017-Jun-14.3964 to 2017-Jun-19.06272). Diameter approximately 0.845 km. from weighted mean H=18.01.
NEODyS16072019-21171691.21e-06-2.30-3.060NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2017-06-14.397 to 2017-06-18.055."

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 19 June '17

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

1818Generated Traffic Report
1706Noted that JPL Sentry has updated its 2017 LO1 risk assessment - see above
1607Noted that JPL Sentry has updated its 2017 LO1 risk assessment - see above
Noted that NEODyS has posted 2017 LO1 as an impact risk - see above
1518Grabbed MPEC 2017-M27 - Daily Orbit Update - see above
0222Grabbed MPEC 2017-M21 - 2013 UT15 - see above
Grabbed MPEC 2017-M22 - 2015 GT50 - see above
Grabbed MPEC 2017-M23 - 2015 KG163 - see above
Grabbed MPEC 2017-M24 - 2015 KH163 - see above
Grabbed MPEC 2017-M25 - 2015 RX245 - see above
Grabbed MPEC 2017-M26 - 2015 RY245 - see above