Contents  on 1 April '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 1 April '17

Thirteen objects reported inside ten LD

Today there are thirteen asteroids known to be within ten lunar distances (LD) of our home world. Nearest of these are three objects inside or entering Earth's SOI (sphere of gravitational influence). Risk-listed NHATS target 2017 FT102 is inbound from 1.74 to 1.37 LD and NHATS target 2017 FU102 from 3.11 to 1.51 LD (on its way into the Earth-Moon system tomorrow), and risk-listed 2017 FX90 comes its closest to us on this passage, reaching 2.37 LD at 1950 UTC. Bill Gray, by the way, has told the Minor Planet Mailing List that 2017 FT102 is traveling slow enough relative to Earth to warrant special astrometric and photometric attention as possibly a natural co-orbital object, perhaps lunar ejecta, or it may be artificial.

Earth passage I D ~Size Distance Today  Notes
0.57 LD tomorrow2017 FU102 6 m  1.51 from 3.11 LD enters Earth SOI, intruder, NHATS target - DOU
0.85 LD March 302017 FJ101 7 m  4.31 to 6.80 LD intruder - DOU
1.05 LD April 32017 FT102 4 m  1.37 from 1.74 LD NHATS target, inside Earth SOI, risk - DOU
1.35 LD March 292017 FY101 12 m  5.89 to 8.34 LD NHATS target
2.05 LD April 32017 FQ127 21 m  5.70 from 8.77 LD risk - DOU
2.37 LD today2017 FX90 18 m  2.37 LD Earth closest at 1950 UTC, risk - DOU
2.57 LD March 222017 FJ3 4 m  5.06 to 5.47 LD NHATS target
3.52 LD March 222017 FW90 8 m  9.63 to 10.55 LD exits ten LD, NHATS target, risk - DOU
3.54 LD March 292017 FR91 14 m  5.79 to 7.58 LD NHATS target
5.75 LD March 272017 FF3 15 m  6.52 to 6.84 LD NHATS target
7.03 LD April 42017 FM101 16 m  9.00 from 10.38 LD enters ten LD, NHATS target - DOU
7.63 LD March 262015 TC25 4 m  8.64 to 9.03 LD radar/NHATS target, risk - MPEC
8.99 LD tomorrow2017 FV 47 m  9.00 from 9.70 LD radar target, risk - DOU

This report was generated at 1912 UTC with the recovery of risk-listed radar/NHATS target 2015 TC25 (MPEC), which passed our planet at 7.63 LD on March 26th but in October 2015 came far closer when it lingered 2.20 days inside the Earth-Moon system. Today's DOU MPEC has follow-up for twelve objects active in the traffic tables here as well as for four departed NHATS targets: 2017 FS91, 2017 FQ63, 2017 FM2, and 2017 DX34, plus distant NHATS target 2017 FB3.

Approaching (sorted by 10-LD bubble entry date)
7.67 LD April 72017 FS102 14 m  < 10 LD April 3, risk - DOU
3.74 LD April 62017 FU64 59 m  < 10 LD April 4 - DOU
9.92 LD April 52017 FX101 30 m  < 10 LD April 4, NHATS target - DOU
4.57 LD April 192014 JO25 812 m  < 10 LD April 18, radar target
7.92 LD May 292017 CS 446 m  < 10 LD May 26, radar target - DOU



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 presently 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 1 April '17

The MPC's NEO Confirmation Page has 85 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 85 objects listed. Of these, 41 were "one nighters." So far The Tracking News has counted a total of 97 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 1 April '17

Minor Planet Electronic Circulars

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


MPEC 2017-G02 - "13:46 UT" - 2015 TC25


<< DOU on 1 Apr. '17 >>  MPEC 2017-G01 - "12:12 UT" - Daily Orbit Update

Observers  on 1 April '17

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
705"Kristie Nault via Apache Point Obs. in New Mexico, 7 in MPEC 2017-G01 -- 2017 FX90, 2017 FW101, 2017 FS91, 2017 FS2, 2017 FR2, 2017 FM2, 2017 FB3
T05ATLAS Haleakala in Hawaii, 3 in MPEC 2017-G01 -- 2017 CS, 2017 CR32, 22771
T08ATLAS Mauna Loa in Hawaii, 4 in MPEC 2017-G01 -- 89830, 40267, 138359, 10636
I47Auger Obs. in Argentina, 2 in MPEC 2017-G01 -- 2017 FR90, 2016 VT2
160Castelmartini Obs. in Italy, 1 in MPEC 2017-G01 -- 2017 FQ127
107Cavezzo Obs. in Italy, 3 in MPEC 2017-G01 -- 370307, 252091, 143404
006Fabra Obs. in Spain, 4 in MPEC 2017-G01 -- 90075, 143404, 11398, 10636
K73Gravina Obs. in Italy, 2 in MPEC 2017-G01 -- 143404, 5604
J95Great Shefford Obs. in England, 2 in MPEC 2017-G01 -- 2017 FV, 2017 FT102
H15ISON New Mexico Obs. in New Mexico, 1 in MPEC 2017-G01 -- 3352
Q60ISON Siding Spring Obs. in New South Wales, 2 in MPEC 2017-G01 -- 136897, 11066
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2017-G01 -- 2016 GB241
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2017-G01 -- 1864
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-G01 -- 138155
118Modra Obs. in Slovakia, 1 in MPEC 2017-G01 -- 143404
474Mt. John Obs. in New Zealand, 4 in MPEC 2017-G01 -- 2017 FW90, 2017 FT102, 2017 FQ91, 2017 FL102
G96Mt. Lemmon Survey (MLS) in Arizona, 20 in MPEC 2017-G01 -- 2017 FX101, 2017 FW64, 2017 FQ63, 2017 FQ, 2017 FH90, 2017 FH3, 2017 EN, 2017 EA3, 2017 BG85, 2011 ED78, 2004 SW55, 484795, 483662, 483560, 409256, 38086, 159560, 138359, 137158, 7335
J69North Obs. in England, 1 in MPEC 2017-G01 -- 2017 FX90
Z80Northolt Branch Obs. in England, 1 in MPEC 2017-G01 -- 474231
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2017-G01 -- 2017 FH63, 2016 LE9, 483662, 381906, 11398
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 22 in MPEC 2017-G01 -- 2017 FU64, 2017 EN, 2017 DT37, 2017 DS35, 2017 CS, 2017 AP20, 2017 AC5, 2013 RM43, 2010 UD, 2006 UM, 2006 EC1, 1998 HK1, 90075, 89830, 370702, 370307, 317255, 252091, 250620, 143404, 11398, 5604
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2017-G01 -- 317255
C95SATINO-1 in France, 1 in MPEC 2017-G01 -- 474179
W885M. Kumrucu-Lohmiller in Massachusetts via Slooh.com Chile Obs. in Chile, 1 in MPEC 2017-G01 -- 2017 FR90
Y00SONEAR in Brazil, 2 in MPEC 2017-G01 -- 2017 FR90, 138404
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2017-G01 -- 2017 FX64, 2017 FQ63, 2017 FP64, 2017 FN, 2017 FE101, 2017 DC109
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2017-G01 -- 2017 FG3, 2017 DX34, 2014 TY33, 2012 TZ79, 2012 DJ4
V78Spirit Marsh Obs. in Minnesota, 1 in MPEC 2017-G01 -- 143404
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPEC 2017-G01 -- 2017 FW90, 2017 FQ, 2017 FG101
926Tenagra II Obs. in Arizona, 7 in MPEC 2017-G01 -- 2017 FX90, 2017 FX64, 2017 FU102, 2017 FT102, 2017 FM101, 2017 FJ101, 2017 DC38
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 6 in MPECs 2017-G01 & 2017-G02 -- 2017 FW90, 2017 FT102, 2017 FS102, 2017 FO63, 2017 FE101, 2015 TC25
C51WISE in Earth polar orbit, 2 in MPEC 2017-G01 -- 2016 WO1, 427643
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 April '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL 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 JPL NEO Program 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 FQ127NEODyS15002072-208925.09e-10-9.87-9.90NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2017-03-29.424 to 2017-03-31.251."
2017 FT102JPL Sentry1730R E M O V E DJPL: Risk listing removed at 1706 UTC.
NEODyS15002095-2117143.23e-05-7.11-7.130NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2017-03-29.276 to 2017-03-31.334."
2017 FS102JPL Sentry1630205111.7e-07-7.65-7.650JPL: "Analysis based on 14 observations spanning 2.9817 days (2017-Mar-28.30176 to 2017-Mar-31.283422)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
2017 FB102NEODyS15002054-211361.87e-06-6.61-6.880NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2017-03-27.552 to 2017-03-30.576."
2017 FE101JPL Sentry1630R E M O V E DJPL: Risk listing removed at 1605 UTC.
NEODyS15002054-210475.43e-09-4.95-5.240NEODyS: "Based on 68 optical observations (of which 0 are rejected as outliers) from 2017-03-25.286 to 2017-03-31.349."
2017 FX90NEODyS1500209511.26e-11-11.75-11.750NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2017-03-25.347 to 2017-03-31.393."
2017 FW90JPL Sentry16302101-210452.8e-05-6.50-6.810JPL: "Analysis based on 65 observations spanning 5.1302 days (2017-Mar-25.34512 to 2017-Mar-30.475271)." Diameter approximately 0.008 km. from mean, weighted H=28.1.
NEODyS15002101-211782.03e-05-6.59-7.170NEODyS: "Based on 57 optical observations (of which 6 are rejected as outliers) from 2017-03-25.346 to 2017-03-30.240."
2017 FO63JPL Sentry1630209712.7e-06-4.56-4.560JPL: "Analysis based on 58 observations spanning 9.8597 days (2017-Mar-21.38988 to 2017-Mar-31.249601)." Diameter approximately 0.070 km. from mean, weighted H=23.4.
2017 FC1NEODyS1500206411.02e-06-6.61-6.610NEODyS: "Based on 84 optical observations (of which 2 are rejected as outliers) from 2017-03-14.416 to 2017-03-30.579."
2017 FVJPL Sentry1530R E M O V E DJPL: Risk listing removed at 1509 UTC.
NEODyS15002113-211761.57e-07-6.72-7.00NEODyS: "Based on 82 optical observations (of which 0 are rejected as outliers) from 2017-03-17.266 to 2017-03-31.309."
2015 TC25JPL Sentry1630R E M O V E DJPL: Risk listing removed at 1618 UTC.

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 1 April '17

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

1912Generated Traffic Report
1730Noted that JPL Sentry has removed 2017 FT102 as an impact risk - see above
1630Noted that JPL Sentry has removed 2015 TC25 as an impact risk - see above
Noted that JPL Sentry has removed 2017 FE101 as an impact risk - see above
Noted that JPL Sentry has updated its 2017 FO63 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FS102 risk assessment - see above
Noted that JPL Sentry has updated its 2017 FW90 risk assessment - see above
1530Noted that JPL Sentry has removed 2017 FV as an impact risk - see above
1500Noted that NEODyS has updated its 2017 FB102 risk assessment - see above
Noted that NEODyS has updated its 2017 FC1 risk assessment - see above
Noted that NEODyS has updated its 2017 FE101 risk assessment - see above
Noted that NEODyS has posted 2017 FQ127 as an impact risk - see above
Noted that NEODyS has updated its 2017 FT102 risk assessment - see above
Noted that NEODyS has updated its 2017 FV risk assessment - see above
Noted that NEODyS has updated its 2017 FW90 risk assessment - see above
Noted that NEODyS has updated its 2017 FX90 risk assessment - see above
Grabbed MPEC 2017-G01 - Daily Orbit Update - see above
Grabbed MPEC 2017-G02 - 2015 TC25 - see above