Table 3
ICRS positions of HD 7977 from various catalogues and our own measurements based on several photographic surveys (see 3.3 for details).
| RA epoch | Dec epoch | Source | RA(s) 1h 20m | Dec (arcsec) +61° 52′ | RA error (s) | Dec error (arcsec) | Reference | Used |
|---|---|---|---|---|---|---|---|---|
| 1842.0 | 1842.0 | Argelander(a) | 31s.69 | 57″.7 | 0.01 | 0″.1 | 1 | * |
| 1875.0 | 1875.0 | Argelander(a) | 31s.69 | 57″.8 | 0.01 | 0″.1 | 2 | * |
| 1877.1 | 1877.1 | H+G Krueger(a) | 31s.95 | 56″.6 | 0.01 | 0″.1 | 3 | |
| 1903.94 | 1903.94 | VO (a) | 31s.676 | 57″.40 | 0.022 | 0″.195 | 4 | * |
| 1903.94 | 1903.94 | our VO (c) | 31s.627 | 57″.51 | 0.019 | 0″.17 | This paper | * |
| 1903.94 | 1903.94 | our VO (c) | 31s.675 | 57″.17 | 0.024 | 0″.15 | This paper | * |
| 1929.8 | 1929.9 | AGK2 (a) | 31s.56 | 57″.3 | 0.01 | 0″.1 | 5 | * |
| 1933.69 | 1932.62 | PPM (a) | 31s.617 | 57″.18 | 0.016 | 0″.11 | 6 | |
| 1943.816 | 1944.427 | ACRS (a) | 31s.597 | 57″.25 | 0.022 | 0″.195 | 7 | * |
| 1950.0 | 1950.0 | SAO (a) | 31s.482 | 57″.64 | 0.024 | 0″.360 | 8 | |
| 1951.81 | 1951.81 | AGK3U (a) | 31s.586 | 57″.35 | 0.015 | 0″.106 | 9 | * |
| 1954.8 | 1954.8 | our POSSI-E(b) | 31s.5684 | 56″.863 | 0.0097 | 0″.043 | This paper | * |
| 1954.8 | 1954.8 | our POSSI-O(b) | 31s.5530 | 56″.867 | 0.0051 | 0″.036 | This paper | * |
| 1983.123 | 1983.123 | FONAC(a) | 31s.6095 | 57″.075 | 0.0047 | 0″.057 | 10 | * |
| 1983.9 | 1983.9 | our Pal-QV(b) | 31s.6270 | 56″.798 | 0.0038 | 0″.030 | This paper | * |
| 1989.68 | 1989.02 | UCAC4(a) | 31s.6252 | 57″.061 | 0.0018 | 0″.027 | 11 | * |
| 1989.8 | 1989.8 | our POSSII-J(b) | 31s.5826 | 57″.169 | 0.0038 | 0″.016 | This paper | * |
| 1991.00 | 1991.01 | PPMX(a) | 31.6539 | 57″.045 | 0.0011 | 0″.008 | 12 | |
| 1991.10 | 1991.19 | Tycho-2 (a) | 31s.5956 | 57″.044 | 0.0011 | 0″.008 | 13 | * |
| 1991.8 | 1991.8 | our POSSII-F (b) | 31s.5805 | 57″.063 | 0.0027 | 0″.012 | This paper | * |
| 1993.8 | 1993.8 | our POSSII-N (b) | 31s.5877 | 57″.127 | 0.0022 | 0″.008 | This paper | * |
| 2000.0 | 2000.0 | ACT (a) | 31s.5929 | 57″.010 | 0.0009 | 0″.006 | 14 | |
| 2003.672 | 2003.672 | UCAC5 (a) | 31.61012 | 57″.0661 | 0.00003 | 0″.0003 | 15 | * |
| 2013.550 | 2013.550 | URAT1 (a) | 31s.5924 | 57″.189 | 0.0016 | 0″.011 | 16 | * |
| 2015.0 | 2015.0 | Gaia DR1 (a) | 31s.596488 | 57″.07803 | 0.000031 | 0″.00030 | 17 | |
| 2015.5 | 2015.5 | Gaia DR2 (a) | 31s.5965293 | 57″.0780133 | 0.0000032 | 0″.0000261 | 18 | |
| 2016.0 | 2016.0 | Gaia DR3 (a) | 31s.5965296 | 57″.0779238 | 0.0000028 | 0″.0000236 | 19 | * |
Notes. The first three columns present the Right Ascension and Declination epochs, and the data source; the next four columns contain positions and their uncertainties. The eighth column gives references, and in the last column, the values we used in the proper motion estimation are marked with an asterisk. (a)Star catalogue. (b)Scanned photographic plate astrometry. (c)Measured photographic plate astrometry.
References. (1) Oeltzen (1852); (2) Argelander (1903); (3) Krueger (1890); (4) Urban et al. (1996); (5) Astronomische Gesellschaft (1951); (6) Roeser & Bastian (1988); (7) Corbin et al. (1991); (8) Whipple (1966); (9) Heckmann (1975); (10) Andruk et al. (2016); (11) Zacharias et al. (2013); (12) Röser et al. (2008); (13) Høg et al. (2000); (14) Urban et al. (1998); (15) Zacharias et al. (2017); (16) Zacharias et al. (2015); (17) Gaia Collaboration (2016); (18) Gaia Collaboration (2018); (19) Gaia Collaboration (2023b).
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