| Identification Data |
| Common Name | Diadem |
| Constellation | Coma Berenices |
| Star Name | 42alp Com |
| Skymap Number | 13100007 |
| Henry Draper (HD) Number | 114378 |
| Harvard Revised (HR) Number | 4968 |
| SAO Number | 100443 |
| Durchmusterung (DM) Number | BD+18 2697 |
Washington Double Stars (WDS) Number
| 13100+1732
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 129630 |
| Right Ascension (RA) J2000 | 13h 9m 59.276s |
| Declination (Dec) J2000 | +17° 31' 45.953" |
| Position Uncertainty | 0.2633s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.03118 |
| Proper Motion in Dec (J2000) | +0.129766 |
| Radial Velocity | -018.2km s-1 |
| Trigonometric Parallax | +0.06981s |
| Trigonometric Parallax Uncertainty | 0.02758s |
| GCI Unit Vector in X (J2000) | -0.909444 |
| GCI Unit Vector in Y (J2000) | -0.286694 |
| GCI Unit Vector in Z (J2000) | 0.301196 |
| Galactic Longitude | 327.99° |
Galactic Latitude
| 79.49°
|
| Observational Data |
| Observed Visual Magnitude (V) | 4.329 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.050 |
| Observed B Magnitude | 4.785 |
| Observed B-V Colour | +0.456 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.050 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 5.6 |
| Observed Photographic Magnitude | 4.6 |
| Morgan Keenan (MK) Spectral Type | F5V+F5V |
| One-Dimensional Spectral Class | |
| Position Angle | |
| Year of Observation | 1993. AD |
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