| Identification Data |
| Common Name | |
| Constellation | Ophiuchus |
| Star Name | 42the Oph |
| Skymap Number | 17220004 |
| Henry Draper (HD) Number | 157056 |
| Harvard Revised (HR) Number | 6453 |
| SAO Number | 185320 |
| Durchmusterung (DM) Number | CD-2413292 |
Washington Double Stars (WDS) Number
|
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 266753 |
| Right Ascension (RA) J2000 | 17h 22m 0.578s |
| Declination (Dec) J2000 | -24° 59' 58.364" |
| Position Uncertainty | 0.0075s |
| Proper Motion in RA (J2000)/cos(Dec) | -0.00065 |
| Proper Motion in Dec (J2000) | -0.023666 |
| Radial Velocity | -002.0km s-1 |
| Trigonometric Parallax | +0.00579s |
| Trigonometric Parallax Uncertainty | 0.00069s |
| GCI Unit Vector in X (J2000) | -0.149547 |
| GCI Unit Vector in Y (J2000) | -0.893888 |
| GCI Unit Vector in Z (J2000) | -0.422611 |
| Galactic Longitude | 0.47° |
Galactic Latitude
| 6.55°
|
| Observational Data |
| Observed Visual Magnitude (V) | 3.26 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.002 |
| Observed B Magnitude | 3.07 |
| Observed B-V Colour | -0.187 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.002 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 3.4 |
| Observed Photographic Magnitude | 3.2 |
| Morgan Keenan (MK) Spectral Type | B2IV |
| One-Dimensional Spectral Class | B3 |
| Position Angle | 234 |
| Year of Observation | 1992. AD |
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