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Article: <5d0ek4$2bs@dfw-ixnews9.ix.netcom.com>
From: saquo@ix.netcom.com(Nancy )
Subject: Re: HALE-BOPP vs 12TH PLANET
Date: 1 Feb 1997 22:03:48 GMT
In article <5cpaol$l4u@news.Hawaii.Edu> David Tholen
demands:
>>>> I ran these orbital elements into my Skymap
program and see that
>>>> NASA has indeed moved the perihelion placement
AWAY from occulting
>>>> Gamma Andromedae. I note with amusement that
this only occurred
>>>> AFTER the Zetas called them on this occultation
maneuver.
>>>
>>> Balderdash. Please reproduce any set of orbital
elements from
>>> the past year that shows any occultation with this
star. Be sure
>>> to provide the source.
>>
>> The source is NASA, JPL, and the IAU.
>
> I don't want your web site as a source of orbital elements
that
> show an occultation. I want the alleged NASA or JPL or IAU
> source.
> tholen@galileo.ifa.hawaii.edu
Well that's what my web site on Hale-Bopp SHOWS, but as I guess you're lazy as well unable to do anything but nit-pick, I've plopped a partial copy below.
........
COMET COMMENTS by Don Marchholz, 12 Sept 1995 00:13:21 GMT
Two new comets have been discovered recently, one should be visible in our morning sky soon. Meanwhile, Comet Hale-Bopp continues to lookpromising.
THE POSITION OF HALE-BOPP THROUGH 1997
Below is a table giving information about Comet Hale-Bopp through 1997. The date is followed by Right Ascension and Declination in 2000 coordinates. ...
..........
Sky & Telescope, SKY Online - Comet Hale-Bopp, Comet Hale-Bopp Is Coming!, By Edwin L. Aguirre, Adapted from Sky & Telescope, November 1995
Comet Hale-Bopp's Path
The following orbital elements (equinox 2000.0), calculated by Brian Marsden, are adapted from Minor Planet Circular 25,623:
| Perihelion date | T 1997 Mar. 31.96 UT |
| Perihelion distance | q 0.9143 a.u. |
| Eccentricity | e 0.9953 |
| Argument of perihelion | 130.57 |
| Longitude of ascending node | 282.47 |
| Inclination | i 89.43 |
........
NASA, Minor Planet Center Orbital Elements for Comet Hale-Bopp (1995-01), 22 February, 1996
Corrected Elements (J2000): Solution 22
| Epoch: | 2450520.50000 = 1997 Mar 13.00000 |
| EC | .995028866 |
| QR | .914124471 |
| TP | 2450539.66868 1997 Apr 1.16868 |
| OM | 282.47106 |
| W | 130.59479 |
| IN | 89.42762 |
The following (J2000) osculating orbital elements can be used to generate ephemeris data using two body programs. However, care must be taken to select an orbital element set with an epoch close to the desired ephemeris output times. ...
.......
Orbit and Ephemeris Information for Comet 1995 O1 Hale-Bopp, Don Yeomans - JPL, May 28, 1996
Additional observations through May 25, 1996, provided by the Minor Planet Center, have been used to update the orbit, ephemeris, and error analysis.
| Object: | Comet C/1995 O1 (Hale-Bopp) |
| Ref. Solution: | 32 |
| Planetary Ephemeris: | DE403 |
| No. Observations: | 936 |
| Observation Arc: | 1993 Apr 27 - 1996 May 25 |
Residual Summary RA Dec Total
| Mean | .005 | .003 | .005 |
| RMS, unweighted | .667 | .845 | .761 |
| Corrected Elements (J2000): Solution 32 | ||
| Epoch | 2450520.50000 = 1997 Mar 13.00000 | Post-Fit Std.Dev. |
| e | 0.995038361 | .000005177 |
| q | 0.914119479 | .000009551 |
| Tp | 2450539.6668732 | .0031738483 1997 Apr 1.16687 |
| Node | 282.4709323 | .0000289 |
| w | 130.5943673 | .0003987 |
| i | 89.4283468 | .0002580 |
ORBITAL ELEMENTS FOR COMET HALE-BOPP (1995 O1)
The following (J2000) osculating orbital elements can be used to generate ephemeris data using two body programs. However, care must be taken to select an orbital element set with an epoch close to the desired ephemeris output times.
Elements at other epochs:
| Epoch (TDB) | |||||
| e | q | Node | w | i | |
| Tp 1996 May 8.5 | |||||
| .99643474 | .916590274 | 282.471540 | 130.433689 | 89.409049 | |
| 1997 Mar 31.946736 | |||||
| 1996 Jun 01.0 | |||||
| .99599928 | .915777977 | 282.473417 | 130.484426 | 89.431978 | |
| 1997 Apr 01.034170 | |||||
| 1996 Jul 16.0 | |||||
| .99550897 | .914887986 | 282.473920 | 130.540972 | 89.436722 | |
| 1997 Apr 01.116403 | |||||
| 1996 Oct 04.0 | |||||
| .99516562 | .914311382 | 282.472611 | 130.579416 | 89.431303 | |
| 1997 Apr 01.156988 | |||||
| 1997 Mar 13.0 | |||||
| .99503836 | .914119479 | 282.470932 | 130.594367 | 89.428347 | |
| 1997 Apr 01.166873 | |||||
| 1997 Sep 09.0 | |||||
| .99502984 | .914060475 | 282.470095 | 130.590516 | 89.427269 | |
| 1997 Apr 01.166023 | |||||
| e: | Eccentricity |
| q: | Perihelion passage distance (AU) |
| Node: | Longitude of the ascending node (deg.) |
| w: | Argument of perihelion (deg.) |
| i: | Inclination (deg.) |
| Tp: | Perihelion passage time (TDB) |
Ephemeris data at 1 day and 5 day steps (O hours UTC) D.K. Yeomans (JPL) - May 28, 1996. Ephemeris computed using orbital solution No. 32 dated May 28, 1996. Magnitude predictions are only crude estimates.
Absolute (inertial) plane-of-sky ephemeris uncertainties (1-sigma) over this interval are as follows:
1996 Apr. - Sep. 03"
1997 Jan. - Feb. 10"
1997 Mar. 30"
1997 Apr. 20"
Ephemeris (with perturbations) for Comet C/1995 O1 (Hale-Bopp)
.........
NASA
From: DAN DUBRICK
Number: 587
Status: PUBLIC
To: ALL
Date/Time: 06-05-96 at 23:43
Subject: 5\28 Latest Comet Hale-Bo
Conference: 472...FN_SB-NASA_News
Latest Comet Hale-Bopp Ephemeris - May 28, 1996
The latest Comet Hale-Bopp Ephemeris is available for freqing from SpaceBase(tm) line 2 at (604)473-9358. File name to be requested is HBOP9606.TXT
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