Contents  on 26 February '18

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 26 February '18

Seven objects reported inside ten LD

Seven minor planets are reported within ten lunar distances (LD) of Earth today. Closest is intruder 2018 DU, which finishes leaving the Earth-Moon system, moving out from 0.78 to 1.43 LD.

Neighborhood Traffic - sorted by Earth passage distance, grouped by 1.0, 2.41, 5.0 & 10.0 LD boundaries
Earth passage I D ~Size Distance today  Inside ten LD Notes
0.74 LD yesterday 2018 DU 8 m  0.78 to 1.43 LD Feb. 15 - March 7 intruder today, NHATS target,
inside Earth SOI - DOU
2.29 LD yesterday 2018 DR 11 m  2.69 to 3.76 LD Feb. 18 - March 3 NHATS target
3.7   LD Feb. 24* 2017 DR109 10 m  4.7 to 5.9 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
4.18 LD tomorrow 2018 DT 13 m  4.18 from 4.24 LD Feb. 11 - March 15 NHATS target - DOU
5.18 LD Feb. 24 2018 CE14 26 m  6.02 to 7.45 LD Feb. 20 - 28 NHATS target
5.44 LD tomorrow 2018 CU14 10 m  5.46 from 5.63 LD Feb. 19 - March 8 NHATS target
6.66 LD Jan. 15 2018 AV2 6 m  9.34 to 9.47 LD Nov. 10 - March 2 NHATS target, natural?

This report was generated at 1920 UTC with first follow-up in today's DOU MPEC for approaching 2018 DH1 along with continuing follow-up for approaching 2017 VR12, inbound 2018 DT, outbound intruder 2018 DU, and departed 2018 BQ, plus astrometry from late January for 2018 BA3, 2018 AL12, and 2018 AJ.

Approaching Traffic - sorted by 10-LD bubble entry date
Earth passage I D ~Size Distance today  Inside ten LD Notes
3.76 LD March 7 2017 VR12 273 m  12.32 from 13.65 LD Feb. 28 - March 13 radar/NHATS target - DOU
9.27 LD March 3 2018 DC 38 m  12.69 from 14.02 LD March 1 - 5 NHATS target
6.9   LD March 10* 2015 DK200 26 m  21.4 from 23.2 LD March 6 - 14 EPU +/- 23.45 hours*, NHATS target
9.1   LD March 27* 2018 DH1 208 m  102.3 from 98.5 LD March 26 - 28 EPU +/- 8.45 hours* - DOU
* EPU = Earth passage uncertainty


Reading:  The SETI Institute has a news item about using the new Unistellar eVscope to participate in an occultation campaign. This easily transported and aimed 11.4-cm. telescope uses light amplification for eyepiece viewing and now has software modified to properly record a stellar occultation by an asteroid. In this case it was a magnitude-11.3 star by Main Belter 175 Andromache on January 27th. In advocating citizen science, the news item notes that "Every year, an average of three to five occultations can be observed from any one location on Earth, and that number becomes much higher if people are willing to travel no more than 100 km from home."
        A new science paper from EURONEAR reports on approaching "the astronomy teaching process for the students in computer sciences through the controlled investigation method on real astronomical data, using data reduction and quality control of the astrometry of near-Earth asteroids."



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 temporal distances are derived by A/CC from JPL Horizons data. "LD*" indicates some uncertainty in object passage time and distance. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 26 February '18

The MPC's NEO Confirmation Page has 58 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 58 objects listed. Of these, 30 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 26 February '18

Minor Planet Electronic Circulars

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


<< DOU on 26 Feb. '18 >>  MPEC 2018-D70 - "13:05 UT" - Daily Orbit Update

Observers  on 26 February '18

A total of 20 observers appear in today's MPEC.

CodeObserver / observatory
Z36Cancelada Obs., 1 in MPEC 2018-D70 -- 3752
160Castelmartini Obs. in Italy, 11 in MPEC 2018-D70 -- 2017 XB2, 2017 SL33, 2016 CL32, 2004 CK39, 509935, 505667, 322763, 265196, 163691, 137925, 1627
703Catalina Sky Survey (CSS) in Arizona, 21 in MPEC 2018-D70 -- 2018 DT, 2018 DG1, 2018 CP14, 2018 CO2, 2017 SR32, 2015 RL82, 2012 DG61, 2007 LU19, 2000 YG29, 505657, 27346, 259802, 185853, 163691, 152931, 137925, 137799, 6455, 1981, 1866, 1864
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 15 in MPEC 2018-D70 -- 2018 DL, 2018 CZ13, 2018 CY1, 2018 CR2, 2018 CH14, 2018 CD1, 2018 CC14, 2018 BP5, 2018 BL6, 2018 BK3, 2018 AL18, 2018 AF4, 2017 YP5, 2017 YA6, 2017 UK2
K87Dettelbach Vineyard Obs. in Germany, 1 in MPEC 2018-D70 -- 2018 DT
238Grorudalen Obs. in Norway, 1 in MPEC 2018-D70 -- 2017 VR12
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-D70 -- 1866
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-D70 -- 2018 CA15
G96Mt. Lemmon Survey (MLS) in Arizona, 27 in MPEC 2018-D70 -- 2018 DT, 2018 DM, 2018 DJ, 2018 DG1, 2018 BV, 2018 BO3, 2018 AV18, 85628, 53435, 38091, 363024, 337557, 325395, 322763, 242708, 220839, 212546, 192563, 177049, 162168, 152964, 142348, 136923, 136849, 6050, 3271, 2212
566NEAT's GEODSS Haleakala telescope in Hawaii, 2 in MPEC 2018-D70 -- 2329, 1627
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2018-D70 -- 1627
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2018-D70 -- 1627
Z80Northolt Branch Obs. in England, 3 in MPEC 2018-D70 -- 2018 CU1, 2004 CK39, 311554
G34Oberfrauendorf Obs. in Germany, 1 in MPEC 2018-D70 -- 2018 DU
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2018-D70 -- 2018 CA15
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2018-D70 -- 2018 DH1, 152952, 12923
204Schiaparelli Obs. in Italy, 17 in MPEC 2018-D70 -- 2018 BT1, 2018 BG3, 2018 BG1, 2018 BC3, 2018 BA3, 2018 AY, 2018 AQ2, 2018 AL12, 2018 AJ, 2017 YU3, 2017 YR1, 2017 YN6, 2017 YN3, 2017 YD8, 2017 YA6, 2017 UR7, 2003 UO12
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2018-D70 -- 2018 CV1, 2018 BS1, 2018 BQ, 2018 AF4, 2017 SW14, 2014 MQ18, 2011 WS2, 2008 CH116, 2003 FU3
I52Steward Obs. Mt. Lemmon Station in Arizona, 8 in MPEC 2018-D70 -- 2018 DT, 2018 DS, 2018 DM, 2018 DL, 2018 DG, 2018 CU1, 2018 CP3, 2018 CP14
Z52The Studios Obs., 3 in MPEC 2018-D70 -- 311554, 162882, 3122
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 February '18

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
2018 CA15JPL Sentry16552028-2115234.748424e-07-6.43-6.860JPL: Computed at 08:36 today Pacific time based on 10 observations spanning .94480 days (2018-Feb-12.40326 to 2018-Feb-13.348059). Diameter approximately 0.022 km. from weighted mean H=25.96.
2008 EL68JPL Sentry16552018-21136113.27877089e-05-5.30-6.010JPL: Computed at 11:57 April 9th of 2017 Pacific time based on 8 observations spanning .07124 days (2008-Mar-06.40768 to 2008-Mar-06.47892). Diameter approximately 0.009 km. from weighted mean H=27.91.

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 26 February '18

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

1920Generated Traffic Report
1655Noted that JPL Sentry has updated its 2008 EL68 risk assessment - see above
Noted that JPL Sentry has posted 2018 CA15 as an impact risk - see above
Grabbed MPEC 2018-D70 - Daily Orbit Update - see above