---
name: "susa2"
section: "1"
platform: "linux"
package: "wcstools"
version: "3.9.7-1.1+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/susa2"
---

# susa2(1)

Find USNO-SA2.0 Catalog stars in a square on the sky

## Name

susa2 - Find USNO-SA2.0 Catalog stars in a square on the sky

## Synopsis

susac \[options\] \[-b or -j\] ra dec

## Description

*suac* finds all of the U.S. Naval Observatory SA2.0 Catalog objects in a specified region of the sky and lists their sky positions and magnitudes in order of brightness. Output is to standard out, unless the -w flag is set, in which case it goes to objectname.uac or search.uac. It is a link to scat.

## Options

**-a** list single closest catalog source **-b \<RA\> \<Dec\>** Output B1950 (FK4) coordinates around this center **-d** Sort by distance from center instead of flux **-h** Print heading, else do not  **-j \<RA\> \<Dec\>** Output J2000 (FK5) coordinates around this center **-m \[\<bright magnitude\>\] \<faint magnitude\>** Limiting catalog magnitude(s) (default none, bright -2 if only faint is given) **-n \<num\>** Number of brightest stars to print  **-o \<name\>** Object name used to name output file **-r \<radius\>** Search radius in arcsec (default 10) **-s** Sort by right ascension instead of flux  **-t** Tab table to standard output as well as file **-u \<num\>** Plate number for catalog sources (0=all) **-v** Verbose listing of processing intermediate results **-w** Write tab table output file imagename.uac

## See Also

[scat(1)](/scat/1.md), [sua2(1)](/sua2/1.md), [imusa2(1)](/imusa2/1.md), [sgsc(1)](/sgsc/1.md)

## Author

Jessica Mink, SAO (jmink@cfa.harvard.edu)