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Methuselah is not in SpaceEngine, why not?

Posted: 12 Jan 2020 08:45
by longname
Title says it all

Methuselah is not in SpaceEngine, why not?

Posted: 12 Jan 2020 10:21
by JackDole
I don't know whether a thread like this is required for such a simple question. (Please read the forum rules.)
For example, you could have asked in this thread: COMMUNITY ADDON - Catalog Fixes for SE

Besides, it is not true. The star is in SpaceEngine, just not under the name 'Methuselah', but under its catalog names 'HIP 76976' or 'HD 140283'. (As far as I know, the name is also not official.)
The data of the star may not be completely correct, this is because the data in the Hipparchos catalog are a bit short.

(For some reason the names are not shown in the list in the search window, but SpaceEngine still finds the star.)


The planet 'Methuselah', which is a planet of the pulsar 'PSR B1620-26', is by the way also in SE.

Methuselah is not in SpaceEngine, why not?

Posted: 12 Jan 2020 10:54
by JackDole
Okay, I made a script to replace the catalog star.
(Put the script in the 'addons\catalogs\stars' folder.)
// -*- coding: utf-8 -*-
// Filename: Methuselah.sc
// JackDole (Gerhard H. Quast) 2020.01.12 19:24:09

// https://en.wikipedia.org/wiki/HD_140283
// http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+140283
//------------------------------------------------------------------------------

LogLevel 1

Star "Methuselah/HIP 76976/HD 140283/GJ 1195/Gaia DR2 6268770373590148224"
{
    RA      15 43 03.0967798658
    Dec     -10 56 00.595803430
    Dist    62.057838
    
    Class   "F9 V"
    MassSol 0.780       // or 0.805
    RadSol  2.04
    
    AppMagn 7.205
    Lum     4.82
    Teff    5787
    FeH     -2.40
    
    Age     14.46       // +- 0.8
}

//------------------------------------------------------------------------------

Methuselah.sc
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Methuselah is not in SpaceEngine, why not?

Posted: 13 Jan 2020 08:33
by longname
Hmm, Methuselah (the one already in SE) shows up as being 700 million years old instead of ~14 billion years old.

Methuselah is not in SpaceEngine, why not?

Posted: 13 Jan 2020 12:10
by JackDole
As I said here:
JackDole wrote:
Source of the post The data of the star may not be completely correct, this is because the data in the Hipparchos catalog are a bit short.

Many stars in the Hipparcos catalog have no age data (if any), so SpaceEngine randomly generates some age.
But if you use my script, you get 14 billion years.