From: <jim.gorges_at_oubbs.telecom.uoknor.edu>

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

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

algorithm element sets. Additionally, the message contains an address

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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