| Number of entries |
118,218 |
| Entries with associated astrometry |
117,955 |
| Entries with associated photometry |
118,204 |
| Mean sky density |
~3 per square degree |
| Limiting magnitude |
V ~ 12.4 mag |
| Completeness |
Up to V = 7.3 - 9.0 mag (depending on sky position) |
| |
|
| Median precision of positions, J1991.25 (Hp < 9 mag) |
0.77/0.64 mas (RA/dec) |
| Median Precision of parallaxes (Hp < 9 mag) |
0.97 mas |
| Median precision of proper motion (Hp < 9 mag) |
0.88/0.74 mas/yr (RA/dec) |
| 10 per cent (each of the five parameters) better than |
0.47-0.66 mas |
| Distance determined to better than 10 per cent (σπ/π < 0.1 ) |
20853 |
| Distance determined to better than 20 per cent (σπ /π < 0.2 ) |
49399 |
| Inferred ratio of external errors to standard errors |
~1.0-1.2 |
| Estimated systematic errors in astrometry |
<0.1 mas |
| Total number of independent astrometric abscissae |
~3.6 x 106 |
| Median photometric precision (Hp, for Hp < 9 mag) |
0.0015 mag |
| Mean number of photometric observations per star |
110 |
| Total number of Hp photometric measurements |
~13 x 106 |
| Number of entries variable or possibly variable |
11597 (8237 new) |
| Periodic variables |
2712 (970 new) |
| Cepheid type |
273 (2 new) |
| RR Lyrae type |
186 (9 new) |
| δ scuti and SX phoenicis type |
108 (35 new) |
| Eclipsing binaries (e.g., EA, EB, EW, ...) |
917 (343 new) |
| Other types (e.g., M, SR, RV Tau, ..) |
1238 (576 new) |
| Non-periodic and unsolved (e.g., RCrB, γ Cas, Z And) |
5542 (4145 new) |
| Not investigated (including micro-variables) |
3343 (3122 new) |
| Number of solved or suspected double/multiple systems |
23882 |
| Systems with component data (annex part C) |
12195 (2996 new) |
| Orbital systems (annex part O) |
235 |
| Astrometric binaries (annex parts G and V) |
2910 |
| Suspected non-single (including annex part X) |
8542 |
Sign in
Science & Technology