Contents  on 2 January '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 2 January '18

Four objects reported inside ten LD

Four asteroidal objects are reported within ten lunar distances (LD) of our home world today. Nearest is 2017 YD7, which is inbound from 5.32 to 4.73 LD.

Earth passage I D ~Size Distance today  Inside ten LD Notes
0.58 LD Dec. 28 2017 YZ4 8 m  9.22 to 11.34 LD Dec. 23 - today intruder, NHATS target, exits ten LD
1.93 LD Dec. 24 2017 YS1 6 m  6.38 to 7.07 LD Dec. 11 - Jan. 7 NHATS target
4.73 LD tomorrow 2017 YD7 12 m  4.73 from 5.32 LD Dec. 30 - Jan. 6 NHATS target - DOU
7.74 LD Dec. 30 2017 YU1 20 m  9.00 to 9.98 LD Dec. 26 - tomorrow NHATS target
Approaching (sorted by 10-LD bubble entry date)
3.7   LD Feb. 24* 2017 DR109 10 m  107.3 from 110.1 LD Feb. 18 - March 1 EPU +/- 30 mins.*, NHATS target
3.76 LD March 7 2017 VR12 272 m  85.71 from 87.18 LD Feb. 28 - March 13 radar/NHATS target
* EPU = Earth passage uncertainty

This report was updated at 2222 UTC with the discovery of already departed 2017 YF8 (MPEC), which flew by Earth at 5.83 LD on December 22nd. Your first Busy Neighborhood traffic report was generated at 1810 UTC with first follow-up in today's DOU MPEC for 2017 YD7 and continuing follow-up for departed 2006 XY.

Reading:  The Wall Street Journal has brought attention to a recent outside report funded by NASA's Emerging Space Office (ESO) that argues, "Unless NASA finds a way to break a longstanding 'cycle of increasing costs ... human exploration, commercialization and colonization of space will likely remain unaffordable.'" The report's suggested way forward is to support and depend on a growing commercial space sector for lower-cost spacecraft development and operation, using services such as refueling in space from supplies mined from small near-Earth objects, specifically "optical mining" (see video and NIAC-submitted concept). The full report is online (133Mb PDF) and the executive summary has been published here. This report is also connected with the proposed Sutter Survey cubesat telescopes for NEO hunting, a proposal that has received some initial funding from the NASA Innovative Advanced Concepts (NIAC) office.

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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 2 January '18

The MPC's NEO Confirmation Page has 36 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 36 objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 58 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 2 January '18

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.

MPEC 2018-A11 - "20:18 UT" - 2017 YF8

MPEC 2018-A10 - "20:14 UT" - 2017 YE8

MPEC 2018-A09 - "20:10 UT" - 2017 YD8

MPEC 2018-A08 - "20:07 UT" - 2017 YC8

MPEC 2018-A07 - "20:04 UT" - 2017 YB8

MPEC 2018-A06 - "19:32 UT" - 2017 YA8

<< DOU on 2 Jan. '18 >>  MPEC 2018-A05 - "13:04 UT" - Daily Orbit Update

Observers  on 2 January '18

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 14 in MPEC 2018-A05 -- 2007 AG, 96590, 53110, 507366, 505667, 190208, 17182, 162011, 143992, 137805, 137052, 8567, 8037, 1980
T08ATLAS Mauna Loa in Hawaii, 1 in MPEC 2018-A09 -- 2017 YD8
C77Bernezzo Obs. in Italy, 1 in MPEC 2018-A09 -- 2017 YD8
160Castelmartini Obs. in Italy, 6 in MPEC 2018-A05 -- 85628, 294739, 152931, 136839, 3200, 1627
703Catalina Sky Survey in Arizona, 1 in MPEC 2018-A09 -- 2017 YD8
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2018-A05, 2018-A06, 2018-A07 & 2018-A11 -- 2017 YF8, 2017 YB8, 2017 YA8, 2017 YA2
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2018-A09 -- 2017 YD8
J95Great Shefford Obs. in England, 3 in MPECs 2018-A05 & 2018-A09 -- 2017 YP5, 2017 YD8, 2017 YD7
G48Harlingten Research Obs. in New Mexico, 1 in MPEC 2018-A09 -- 2017 YD8
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-A09 -- 2017 YD8
H06#M. Suzuki in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2018-A09 -- 2017 YD8
I89'Steven M. Tilley in Louisiana via iTelescope Obs. Nerpio in Spain, 1 in MPEC 2018-A09 -- 2017 YD8
695^Spacewatch via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2018-A11 -- 2017 YF8
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2018-A06 -- 2017 YA8
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2018-A08 & 2018-A10 -- 2017 YE8, 2017 YC8
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2018-A09 -- 2017 YD8
J69North Obs. in England, 1 in MPEC 2018-A09 -- 2017 YD8
Z80Northolt Branch Obs. in England, 1 in MPEC 2018-A09 -- 2017 YD8
G34Oberfrauendorf Obs. in Germany, 2 in MPECs 2018-A05 & 2018-A09 -- 2017 YD8, 1999 AF4
F51Pan-STARRS 1 (PS1) in Hawaii, 15 in MPECs 2018-A05, 2018-A06, 2018-A07, 2018-A08 & 2018-A11 -- 2017 YF8, 2017 YC8, 2017 YB8, 2017 YA8, 2006 XY, 53319, 495848, 422699, 403039, 163732, 141670, 137084, 112221, 111253, 8176
K63Pascoli Obs. in Italy, 1 in MPEC 2018-A09 -- 2017 YD8
B49Paus Obs. in Spain, 1 in MPEC 2018-A09 -- 2017 YD8
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2018-A05 -- 143992
L04ROASTERR-1 in Romania, 1 in MPEC 2018-A09 -- 2017 YD8
K61Rokycany Obs. in the Czech Republic, 1 in MPEC 2018-A09 -- 2017 YD8
H36Sandlot Obs. in Kansas, 2 in MPECs 2018-A08 & 2018-A09 -- 2017 YD8, 2017 YC8
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2018-A08 -- 2017 YC8
W34Squirrel Valley Obs. in North Carolina, 1 in MPEC 2018-A09 -- 2017 YD8
I52Steward Obs. Mt. Lemmon Station in Arizona, 3 in MPECs 2018-A08, 2018-A09 & 2018-A10 -- 2017 YE8, 2017 YD8, 2017 YC8
926Tenagra II Obs. in Arizona, 5 in MPECs 2018-A05, 2018-A08, 2018-A09, 2018-A10 & 2018-A11 -- 2017 YX4, 2017 YF8, 2017 YE8, 2017 YD8, 2017 YC8
718Wiggins Obs. in Utah, 1 in MPEC 2018-A09 -- 2017 YD8
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2018-A05 -- 2007 AG, 137805
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 January '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.





Notes for Today's Latest Risk Assessments
2017 YE8JPL Sentry22302113-211741.08338e-06-6.47-6.790JPL: Computed at 14:04 today Pacific time based on 20 observations spanning 2.1488 days (2017-Dec-29.28539 to 2017-Dec-31.43417). Diameter approximately 0.026 km. from weighted mean H=25.58.

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 2 January '18

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

2230Noted that JPL Sentry has posted 2017 YE8 as an impact risk - see above
2222Updated Traffic Report
2100Grabbed MPEC 2018-A07 - 2017 YB8 - see above
Grabbed MPEC 2018-A08 - 2017 YC8 - see above
Grabbed MPEC 2018-A09 - 2017 YD8 - see above
Grabbed MPEC 2018-A10 - 2017 YE8 - see above
Grabbed MPEC 2018-A11 - 2017 YF8 - see above
1934Grabbed MPEC 2018-A06 - 2017 YA8 - see above
1650Grabbed MPEC 2018-A05 - Daily Orbit Update - see above