[Newleda-general] [ newleda-Feature Requests-2812649 ] V_LG

[SourceForge.net <no...@so...>]

Feature Requests item #2812649, was opened at 2009-06-26 11:25
Message generated for change (Tracker Item Submitted) made by dimakarov
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=800699&aid=2812649&group_id=156665

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
Status: Open
Priority: 5
Private: No
Submitted By: Dmitry Makarov (dimakarov)
Assigned to: prugniel (prugniel)
Summary: V_LG

Initial Comment:
We have to migrate to another apex when calculating correction for centroid of Local Group. We use old correction from Yahil et al. (1977). NED uses apex derived by Karachentsev&Makarov AJ 111, 794, 1996. So, it is a little bit strange that they use my apex but we not :-)

The apex from Heliocentric to Local Group are L_apex=93 deg, B_apex=-4 deg,	V_apex=316 km/sec.
The formula is
Vcorrected = V_heliocentric + V_apex * ( sin(B)*sin(B_apex) + cos(B)*cos(B_apex)*cos(L-L_apex) )
where L,B, L_apex,B_apex are in Galactic coordinates

also see
http://nedwww.ipac.caltech.edu/help/velc_help.html

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=800699&aid=2812649&group_id=156665