Contents  on 16 March '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 16 March '17

Five objects reported inside ten LD

Five known transient natural objects are within ten lunar distances (LD) of our home world today. Closest is NHATS target 2017 EG3, moving in from 5.15 to 4.46 LD.

Earth passage I D ~Size Distance Today  Notes
4.04 LD March 102017 DA36 32 m  9.15 to 10.63 LD exits ten LD, NHATS target
4.38 LD tomorrow2017 EG3 18 m  4.46 from 5.15 LD NHATS target
4.95 LD March 132017 EK 49 m  7.58 to 9.90 LD DOU
7.04 LD today2017 EE4 36 m  7.04 LD Earth closest at 0630 UTC - DOU
8.34 LD today1998 SL36 309 m  8.34 LD radar target, Earth closest at 1329 UTC
4.57 LD April 192014 JO25 812 m  < 10 LD April 18, radar target
7.63 LD March 262015 TC25 4 m  < 10 LD tomorrow, radar/NHATS target, risk
7.93 LD May 292017 CS 437 m  < 10 LD May 26, radar target - DOU

This report was generated at 1917 UTC with follow-up in today's DOU MPEC for three objects in the traffic table here plus astrometry from early March for 2017 DA38 and NHATS target 2017 DC36, and from February for 2017 BN92.

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 16 March '17

The MPC's NEO Confirmation Page has 41 listings

When last checked at 2326 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 41 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 45 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 16 March '17

Minor Planet Electronic Circulars

As of last check at 2326 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 16 Mar. '17 >>  MPEC 2017-F04 - "12:02 UT" - Daily Orbit Update

MPEC 2017-F03 - "00:57 UT" - 2017 ER13

MPEC 2017-F02 - "00:54 UT" - 2017 EQ13

MPEC 2017-F01 - "00:51 UT" - 2017 EP13

Observers  on 16 March '17

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 21 in MPEC 2017-F04 -- 2017 DS35, 2017 DC36, 2017 DA38, 2017 CO32, 2017 CO, 2017 CN32, 2017 BU31, 2017 BP91, 2017 BO31, 2017 BN92, 2017 BN3, 2017 BL6, 2017 BA30, 2017 AP20, 2016 XD1, 2016 NV, 2015 UM67, 2015 BY310, 311321, 155334, 10636
T05ATLAS Haleakala in Hawaii, 7 in MPEC 2017-F04 -- 484795, 443103, 40267, 250620, 141018, 138846, 1036
T08ATLAS Mauna Loa in Hawaii, 3 in MPEC 2017-F04 -- 485652, 40267, 11398
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2017-F02, 2017-F03 & 2017-F04 -- 2017 EU, 2017 ER13, 2017 EQ13, 2017 EL, 2017 DO34, 2017 DE38, 2017 DC109, 2017 CG1
006Fabra Obs. in Spain, 3 in MPEC 2017-F04 -- 11398, 10636, 5604
K73Gravina Obs. in Italy, 1 in MPEC 2017-F04 -- 5604
695^Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2017-F04 -- 2017 DB36, 2017 CO32
W85LCOGT Cerro Tololo A in Chile, 4 in MPECs 2017-F02, 2017-F03 & 2017-F04 -- 2017 ER13, 2017 EQ13, 2017 CS, 3122
K92LCOGT Sutherland B in South Africa, 1 in MPEC 2017-F03 -- 2017 ER13
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2017-F01 & 2017-F03 -- 2017 ER13, 2017 EP13
C94MASTER-II Tunka in Russia, 1 in MPEC 2017-F04 -- 1627
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2017-F01, 2017-F02, 2017-F03 & 2017-F04 -- 2017 ER13, 2017 EQ13, 2017 EP13, 2016 YF11, 2016 UU80, 2016 UE101, 2016 DP, 89959, 486692, 484517, 192559
W25RMS Obs., 6 in MPEC 2017-F04 -- 2017 EK, 2017 EE4, 2017 AC5, 345646, 138155, 106589
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2017-F04 -- 2017 ES2, 2017 DC38
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2017-F01 & 2017-F04 -- 2017 EP13, 2017 EB3
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPEC 2017-F04 -- 2017 EY2, 2017 EH1, 2017 EA3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2017-F04 -- 2016 WJ1, 2016 SH45
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 March '17

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2326 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.





Notes for Today's Latest Risk Assessments
2017 EQ13NEODyS17322096-211134.02e-09-5.92-6.160NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2017-03-07.536 to 2017-03-14.161."
JPL Sentry0400211611.1e-08-5.52-5.520JPL: "Analysis based on 20 observations spanning 6.6241 days (2017-Mar-07.53556 to 2017-Mar-14.1597)." Diameter approximately 0.360 km. from mean, weighted H=19.9.
2017 BL30NEODyS17322098-211532.98e-08-7.10-7.440NEODyS: "Based on 319 optical observations (of which 0 are rejected as outliers) from 2017-01-28.379 to 2017-03-08.205."
2016 WJ1NEODyS18382104-211567.12e-07-4.58-4.980NEODyS: "Based on 380 optical observations (of which 3 are rejected as outliers) from 2003-07-04.606 to 2016-12-22.212."

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 16 March '17

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

1917Generated Traffic Report
1838Noted that NEODyS has updated its 2016 WJ1 risk assessment - see above
1732Noted that NEODyS has updated its 2017 BL30 risk assessment - see above
Noted that NEODyS has posted 2017 EQ13 as an impact risk - see above
1555Grabbed MPEC 2017-F04 - Daily Orbit Update - see above
0400Noted that JPL Sentry has posted 2017 EQ13 as an impact risk - see above
0118Grabbed MPEC 2017-F02 - 2017 EQ13 - see above
Grabbed MPEC 2017-F03 - 2017 ER13 - see above
0055Grabbed MPEC 2017-F01 - 2017 EP13 - see above