# HANDE Algorithm Elements

Date: Fri, 30 Jun 1995 04:21:57 -0400

Rob Matson, the author of Skymap 5.9, was kind enough to send the
following message describing the individual elements included in HANDE
where interested persons may obtain a copy of "Spacetrack Report 6"
describing the model.

Mr. Matson's message follows:

QUOTE

Haven't forgotten about you, Jim -- just haven't had any spare time lately.
I've got the report in my lap right now. In the front, it says you can
write for a copy at the following address:

Department of Commerce
National Technical Information Service
5285 Port Royal Rd.
Springfield, VA 22161

It also says special inquiries can be addressed to:

Project SPACETRACK Reports
Directorate of Astrodynamics
HQ Air Force Space Command
HQ AFSPACECOM/DOA
Peterson AFB, CO 80914-5001
Stop: 7

The parameters for the 3-line elements in order are as follows:

Line1: Satellite #, Int'l designator, epoch time, 1st-derivative of mean
motion divided by 2, 2nd-derivative of mean motion divided by 6, B (in
meters**2-kg, I think), and the element #.
(This is identical to line 1 of the 2-line sets except B occupies the
position of B-Star).

Line2: Satellite # (again), inclination, right ascension, eccentricity,
argument of perigee, mean anomaly, mean motion, and epoch rev.
(This is the same as line 2 of the 2-line sets).

Line3: Satellite # (again), third-derivative of mean motion divided by 24,
4th-derivative of mean motion divided by 120, first derivative of
eccentricity, 2nd-derivative of eccentricity divided by 2, third derivative
of eccentricity over 6, first-derivative of inclination, first-derivative of
right ascension, first-derivative of argument of perigee, and
first-derivative of mean anomaly.

So, excluding the satellite #, int'l designator, epoch time, epoch rev and
element #, there are really a total of 18 parameters for the HANDE element
set -- 9 more than for the 2-line elements. Let me know if you need more
detailed information, but this at least is a start. --Rob

UNQUOTE.

___ Blue Wave/QWK v2.12
Received on Fri Jun 30 1995 - 10:25:54 UTC

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