| Identification Data |
| Common Name | Marfak |
| Constellation | Cassiopeia |
| Star Name | 30mu Cas |
| Skymap Number | 1070126 |
| Henry Draper (HD) Number | 6582 |
| Harvard Revised (HR) Number | 321 |
| SAO Number | 22024 |
| Durchmusterung (DM) Number | BD+54 223 |
Washington Double Stars (WDS) Number
| 01083+5455
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 26046 |
| Right Ascension (RA) J2000 | 1h 8m 16.394s |
| Declination (Dec) J2000 | +54° 55' 13.221" |
| Position Uncertainty | 0.0052s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.39694 |
| Proper Motion in Dec (J2000) | -1.600466 |
| Radial Velocity | -098.1km s-1 |
| Trigonometric Parallax | +0.13242s |
| Trigonometric Parallax Uncertainty | 0.00060s |
| GCI Unit Vector in X (J2000) | 0.549402 |
| GCI Unit Vector in Y (J2000) | 0.168685 |
| GCI Unit Vector in Z (J2000) | 0.818354 |
| Galactic Longitude | 125.33° |
Galactic Latitude
| -7.85°
|
| Observational Data |
| Observed Visual Magnitude (V) | 5.17 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | |
| Observed B Magnitude | 5.87 |
| Observed B-V Colour | +0.704 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.004 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 5.3 |
| Observed Photographic Magnitude | 5.2 |
| Morgan Keenan (MK) Spectral Type | G5Vb |
| One-Dimensional Spectral Class | G5 |
| Position Angle | 334 |
| Year of Observation | 1974. AD |
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