The ICQ has not updated its keys since 2010, however new observers are submitting observations, new detectors are in use and new catalogues are available. In the interim the following are suggested for use (Updated 2020 October 3):
Magnitude Sources
AQ AAVSO APASS V magnitudes (recommended)
MD Carlsberg Meridian Catalogue 14 (2005). Note this is not the
same version of the catalogue as ICQ key MC which is the 1989 release.
U3 UCAC3 photometry, which lies between V and R and should not normally
be used
U4 UCAC4 photometry, which lies between V and R. Note that the
catalogue also has APASS V magnitudes, which are preferred.
Observers : The designations used by ICQ follow the form of XYZnn. COBS are already using the form XYZaa, ab etc and so we will follow this practice.
ADA04 Gianluigi Adamoli, Italy
AGUaa Salvador Aguirre, Mexico
AMO02 Margarete J Amorim, Brazil
BRYaa Eric Bryssinck, Belgium
BUCaa Denis Buczynski, Tarbatness,
Scotland
CARah Peter Carson, Leigh-on-Sea, Essex
CLAaa Chris Clayton, England
COL03 Emilio Colombo, Italy
DUB01 Yurij Dubrovsky, Ukraine
DYMaa Roger Dymock, Waterlooville, Hampshire
GET Stephen Getliffe, Longstanton, Cambridgeshire
GON06 Virgilio and Mario Gonano, Italy
GUIaa Ernesto Guido, Italy
HILaa Kevin Hills, Cheshire, England
JAMaa Nick James, Chelmsford, Essex
LEHaa Thomas Lehmann
Lorra Alan Lorrain,
Basingstoke, England
Metta Paul Mettam, Long Eaton, Derbyshire
MORad Peter Morris, Upminster, Essex
NAV02 J P Navarro Pina, Spain
PAUaa Nirmal Paul, India
QVA Jan Qvam, Norway
SPOab David Spooner, Steyning, West Sussex
TEE Teerasak Thaluang, Thailand
WATaa Colin Watling, Kessingland, Suffolk
Computer software used for photometric reduction of CCD images:
A48 Astrometrica 4.8 and sub-releases
KPH Kphot http://kometen.fg-vds.de/kphotsoftware.zip
JAM Nick James VEM technique