Contents  on 24 January '19

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 24 January '19

Six objects reported inside ten LD

Six asteroids are reported to be less than ten lunar distances (LD) from Earth today. None are closer than six 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
5.7   LD Jan. 26* 2019 AA10 26 m  6.3 from 7.6 LD Jan. 22 - 29 EPU +/- 6 mins.*
6.95 LD yesterday 2019 AS11 15 m  7.02 to 7.21 LD Jan. 15 - 30 NHATS target
7.45 LD Jan. 19 2019 AB5 27 m  9.58 to 10.57 LD Jan. 15 - 24 exits ten LD
7.6   LD tomorrow* 2019 AJ13 8 m  7.6 from 7.7 LD Jan. 20 - 29 EPU +/- 5 mins.*, NHATS target
8.59 LD tomorrow 2019 AG11 19 m  8.63 from 8.96 LD Jan. 22 - 28
9.1   LD tomorrow* 2019 AN12 28 m  9.2 from 10.4 LD today - tomorrow EPU +/- 18 mins.*, enters ten LD
* EPU = Earth passage uncertainty

This report was generated at 1805 UTC with the addition of returning 2017 PV25, which isn't yet visible to ground-based telescopes. The Minor Planet Center is reporting major computer problems overnight and, at last check, no MPECs have been issued today.

7.3   LD Feb. 12* 2017 PV25 41 m  27.3 from 28.8 LD Feb. 7 - 17 NEW, EPU +/- 1.07 hours*, NHATS target

<< Reading:  Bad Astronomy has a nice collection of reports, images, and links for an impact on the moon seen during the solar eclipse of January 20th. See also

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 24 January '19

The MPC's NEO Confirmation Page has 78 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 78 objects listed. Of these, 38 were "one nighters." So far The Tracking News has counted a total of 81 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 24 January '19

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been no MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

When no Daily Orbit Update (DOU) MPEC has been posted by this time of day, visit the MPC Status Page for possible explanation.

Observers  on 24 January '19

Without MPECs with observations to report, we have no observers to list yet today. For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 January '19

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 and NEODyS listings is 100 years, and both post impact solutions beyond that for some 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
2019 AK12NEODyS16452101-211841.67e-07-8.13-8.23-NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2019-01-14.443 to 2019-01-21.247."

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 24 January '19

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

1805Generated Traffic Report
1645Noted that NEODyS has updated its 2019 AK12 risk assessment - see above