If you are on Debian (no PPA repos) you can download the packages gsc and gsc-data
from here
launchpad.net/~mutlaqja/+archive/ubuntu/ppa/+packages
and install them "by hand": sudo dpkg --install gsc*.deb
$ lsb_release -a && apt info gsc gsc-data
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 10 (buster)
Release: 10
Codename: buster
Package: gsc
Version: 1.3~ubuntu18.04.1
Status: install ok installed
Priority: extra
Section: science
Maintainer: Jasem Mutlaq <
This email address is being protected from spambots. You need JavaScript enabled to view it.>
Installed-Size: 68.6 kB
Depends: libc6 (>= 2.7), gsc-data (>= 1.3~ubuntu18.04.1)
Download-Size: unknown
APT-Manual-Installed: yes
APT-Sources: /var/lib/dpkg/status
Description: Global Star Catalog.
.
The GSC-ACT is a recalibration of the Hubble Guide Star Catalog (GSC), version 1.1, using the ACT (Astrographic Catalog/Tycho) from the US Naval Observatory.
.
The ACT offers better positions and more stars than the reference catalogs originally used to reduce the Guide Star Catalog, so the astrometric fit can include more terms... and this is a very good thing, because the plates include distortions that the simple third-order GSC 1.1 fit cannot accommodate. In GSC-ACT, terms up to order 5 are included.
Package: gsc-data
Version: 1.3~ubuntu18.04.1
Status: install ok installed
Priority: extra
Section: science
Source: gsc
Maintainer: Jasem Mutlaq <
This email address is being protected from spambots. You need JavaScript enabled to view it.>
Installed-Size: 309 MB
Download-Size: unknown
APT-Manual-Installed: yes
APT-Sources: /var/lib/dpkg/status
Description: Global Star Catalog.
.
The GSC-ACT is a recalibration of the Hubble Guide Star Catalog (GSC), version 1.1, using the ACT (Astrographic Catalog/Tycho) from the US Naval Observatory.
.
This package install the data files.