Division F Commission 15 WG - TG On Asteroid Magnitudes


Karri Muinonen

University of Helsinki
Department of Physics
Gustaf Hällströmin katu 2a
PO Box 64
00014 Helsinki

Phone: +358 +358 9 191 22941
Fax: +358 +358 9 191 50610
Organization website: http://www.physics.helsinki.fi/

Last updated:
February 11, 2015


The fundamental role played by the absolute magnitude in numerous areas of research is well known. An accurate asteroid magnitude phase function is needed to reduce asteroid observations. The Working Group is worrying about the very poor state of the H values listed in the major databases, by the potential consequences on the results of a number of recent investigations concerning the size-frequency distribution of the asteroid population, and inferences on the most likely values of asteroid collisional impact strengths. The past Task Group of C15 have created alternate formulations of the H, G1, G2 magnitude phase function to replace the current (H, G) phase function which, if used on properly transformed and calibrated data will eventually result in a catalog of accurate H values. A 2010 paper published on Icarus has suggested that the new proposed photometric system is significantly better than the (H,G) system. The working group will address further the issue.

Group Members (10)


Division F Commission 15 Physical Study of Comets & Minor Planets

Search Scientific Bodies

IAU General Assembly
Honolulu, 3-14 August 2015

IAU General Assembly 2015

IAU e-Newsletter
Volume 2015 n° 13

Latest e-Newsletter

Subscribe to the e-Newsletter


Discuss the IAU Commission reform (Members only)


CAPjournal issue 16 now available

CAPjournal issue 16

NameExoWorlds Contest


IAU Directory for World Astronomy


IAU Office of Astronomy for Development

Office for Astronomy Development

IAU Office for Astronomy Outreach

Office for Astronomy Outreach

Astronomy Outreach Newsletters and Events

Outreach Newsletters

Peer-reviewed Astronomy Education Activities

Astro EDU

Astronomy for Development 
Strategic Plan 2010–2020

Strategic Plan

Portal to the Universe

Portal to the Universe