Coord 2000 | 09096-0847 | Discov num | BRT 426 | Comp | Coord arcsec 2000 | 09 09 35.57 -08 47 15.5 | |||||
Date first | 1896 | Date last | 1896 | Obs | 1 | ||||||
Pa first | 182 | Pa last | 182.2 | P.A. Now (θ) | 182.2° | ||||||
Sep first | 7.8 | Sep last | 7.8 | Sep. Now (ρ) | 7.8" | ||||||
Mag pri | 5.57 | Mag sec | 9.20 | delta mag (ΔM) | 3.63 | Spectral class | K0II/III (yellow-orange) | ||||
Pri motion ra | -018 | Sec motion ra | |||||||||
Pri motion dec | -006 | Sec motion dec | |||||||||
Notes | X (Dubious double) |
Name | 20 Hya | Constellation | Hydra | SAO | 136622 | HIP | 44961 | ||||
Tycho2 | 5445-01781-1 | Gaia DR2 | 5743881423909041536 | HD | 78732 | HR | 3641 | ||||
GC | 12649 | BD | BD-08 2593 | Flamsteed | 20 Hydrae | Flamsteed name | 20 Hya | ||||
Distance | 147.71 | Distance ly | 481.83 |
refcode | metd | author | reference |
Brt1926a | Pa - | Barton, S.G. | 1926AJ.....36..155B |
Brt1926a | AJ 36, 155, 1926 (BRT 1 - BRT 62) | ||
Brt1926b | Pa j | Barton, S.G. | 1926AJ.....37...57B |
Brt1926b | AJ 37, 57, 1926 (BRT 63 - BRT 116) | ||
Brt1928 | Pa - | Barton, S.G. | 1928AJ.....38..168B |
Brt1928 | AJ 38, 168, 1928 (BRT 117 - BRT 230) | ||
Brt1929a | Pa - | Barton, S.G. | 1929AN....235..425B |
Brt1929a | AN 235, 425, 1929 (BRT 294 - BRT 322) | ||
Brt1929b | Pa - | Barton, S.G. | 1929AJ.....39...93B |
Brt1929b | AJ 39, 93, 1929 (BRT 231 - BRT 293) | ||
Brt1929c | Ma j | Barton, S.G. | 1929AJ.....39..120B |
Brt1929c | AJ 39, 120, 1929 | ||
Brt1930 | Pa - | Barton, S.G. | 1930AJ.....40..181B |
Brt1930 | AJ 40, 181, 1930 (BRT 323 - BRT 348) | ||
Brt1931 | Pa - | Barton, S.G. (BRT 349 - BRT 562) | 1931AJ.....41...35B |
Brt1931 | AJ 41, 35, 1931 (no measures for BRT 529 - BRT 562) | ||
Brt1932a | Pa - | Barton, S.G. | 1932AJ.....42...93B |
Brt1932a | AJ 42, 93, 1932 (BRT 604 - BRT 636) | ||
Brt1932b | Ma - | Barton, S.G. | 1932PFAO....5a...1B |
Brt1932b | +Pa | Pub. Univ. Penn. 5, Pt.1, Sec.2, 1932 (BRT 563 - BRT 603, BRT1928, etc.) | |
Brt1932C | Ma - | Barton, S.G. | 1932QB821.A43...... |
Brt1932C | cited in ADS (Aitken Double Star Cat.), 1932 | ||
Brt1933 | Pa - | Barton, S.G. | 1933AN....250...49B |
Brt1933 | AN 250, 49, 1933 | ||
Brt1933 | (BRT 637 - BRT1134; very approximate dates added for pairs listed with only | ||
Brt1933 | secondary magnitudes and no astrometry) | ||
Brt1934 | Pa - | Barton, S.G. | 1934AJ.....43..119B |
Brt1934 | +Ma | AJ 43, 119, 1934 | |
Brt1935a | Pa - | Barton, S.G. | 1935AJ.....44..105B |
Brt1935a | +Ma | AJ 44, 105, 1935 | |
Brt1935b | Pa - | Barton, S.G. | 1935AN....256..357B |
Brt1935b | AN 256, 357, 1935 | ||
Brt1936a | Ma - | Barton, S.G. | 1936AJ.....45...33B |
Brt1936a | +Pa | AJ 45, 33, 1936 | |
Brt1936b | Pa - | Barton, S.G. | 1936AJ.....45...99B |
Brt1936b | +Ma | AJ 45, 99, 1936 | |
Brt1937a | Pa - | Barton, S.G. | 1937AN....263..347B |
Brt1937a | AN 263, 347, 1937 | ||
Brt1937b | Pa - | Barton, S.G. | 1937AN....263..383B |
Brt1937b | AN 263, 383, 1937 | ||
Brt1938 | Ma - | Barton, S.G. | 1938AJ.....47..133B |
Brt1938 | +Pa | AJ 47, 133, 1938 | |
Brt1939a | Ma - | Barton, S.G. | 1939PFAO....5b...1B |
Brt1939a | +Pa | Pub. Univ. Penn. 5, Pt.2, Sec.2, 1939 | |
Brt1939b | Pa - | Barton, S.G. | 1939AJ.....48..145B |
Brt1939b | +Ma | AJ 48, 145, 1939 | |
Brt1941 | Pa - | Barton, S.G. | 1941PASP...55..339B |
Brt1941 | PASP 55, 339, 1941 | ||
Brt1942 | Pa - | Barton, S.G. | 1942AJ.....50...11B |
Brt1942 | AJ 50, 11, 1942 | ||
Brt1947 | Ma - | Barton, S.G. | 1947AJ.....52..178B |
Brt1947 | +Pa | AJ 52, 178, 1947 | |
Brt1949 | Ma - | Barton, S.G. | 1949PFAO....7a...1B |
Brt1949 | Pub. Univ. Penn. 7, Pt.1, Sec.1, 1949 | ||
Brt1951 | Pa - | Barton, S.G. | 1951AJ.....55..218B |
Brt1951 | AJ 55, 218, 1951 | ||
Brt1957 | Ma - | Barton, S.G. | 1957QB4.P5v7ps3.... |
Brt1957 | Pub. Univ. Penn. 7, Pt.3, 15, 1957 | ||
Brt9999 | Ma - | Barton, S.G. | ................... |
Brt9999 | +Pa | Unpublished, manuscript or reference not found. | |
Brt2002A | Ma - | Barton, S.G. | 2002yCat.1275....0D |
Brt2002A | +Pa | cited in CCDM |
coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
09096-0847 | BRT 426 | 1896 | 1 | 182 | 7.8 | 5.57 | 9.20 | 090935.57-084715.5 |
Click on the map to see the double of your interest. Pass over with the mouse cursor to display the catalog designation. |
Click on the map to see the double of your interest. Pass over with the mouse cursor to display the catalog designation. |
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A | |
B | pa=182.2° sep=7.80" |
Componente originario normalizzato | AB | Name | 20 Hya | Coord arcsec 2000 | 090935.57-084715.5 | Mag | 5.57 | ||||
Spectral class | K0II/III (yellow-orange) | PmRA | -18.00 | PmDE | -6.0 | SAO | 136622 | ||||
HIP | 44961 | Tycho2 | 5445-01781-1 | HD | 78732 | HR | 3641 | ||||
GC | 12649 | BD | BD-08 2593 | Flamsteed | 20 Hydrae | Flamsteed name | 20 Hya |
Tycho2 | 5445-01781-1 | Pflag | RAmdeg | 137.39820783 | DEmdeg | -8.78764856 | |||||
PmRA | -17.0 | PmDE | -7.1 | E RAmdeg | 4 | E DEmdeg | 4 | ||||
E pmRA | 1.0 | E pmDE | 1.0 | EpRAm | 1991.29 | EpDEm | 1991.47 | ||||
Num | 13 | Q RAmdeg | 1.0 | Q DEmdeg | 0.5 | Q pmRA | 0.9 | ||||
Q pmDE | 0.4 | BTmag | 6.712 | E BTmag | 0.015 | VTmag | 5.566 | ||||
E VTmag | 0.009 | Prox | 999 | TYC | T | HIP | 44961 | ||||
CCDM | RAdeg | 137.39824750 | DEdeg | -8.78763250 | EpRA 1990 | 1.75 | |||||
EpDE 1990 | 1.89 | E RAdeg | 3.7 | E DEdeg | 4.1 | Posflg | |||||
Corr | 0.0 |
SAO | 136622 | DelFlag | RA1950 | PmRA1950 | -0.0016 | ||||||
DE1950 | PmDE1950 | -0.015 | Vmag | 5.7 | SpType | G5 | |||||
Double code | Source | 70 | CatNum | 12649 | DM | BD-08 2593 | |||||
DMcomp | BDsup | HD | 78732 | M HD | 0 | ||||||
GC | 12649 | RA1950rad | 2.38737845 | DE1950rad | -0.14981407 | PmRA2000 | -0.0013 | ||||
PmDE2000 | -0.01 |
Catalog | H | HIP | 44961 | Proxy | RAhms | 09 09 35.58 | |||||
DEdms | -08 47 15.5 | Vmag | 5.47 | VarFlag | R Vmag | H | |||||
RAdeg | 137.398 | DEdeg | -8.78763 | AstroRef | Plx | 5.08 | |||||
CCDM | N CCDM | Nsys | Ncomp | 1 | |||||||
MultFlag | Source | Qual | M HIP | ||||||||
Theta | Rho | HD | 78732 | BD | BD-08 2593 | ||||||
CD | CP | Dm number | -08 2593 | VIred | 0.88 | ||||||
SpType | G8II | R SpType | Coord arcsec 2000 | 090935.58-084715.5 |
HIP | 44961 | Sn | 5 | So | 0 | Nc | 1 | ||||
RArad | 2.3980518402 | DErad | -0.1533730922 | Plx | 6.77 | PmRA | -17.5 | ||||
PmDE | -6.03 | E RArad | 0.27 | E DErad | 0.3 | E Plx | 0.32 | ||||
E pmRA | 0.32 | E pmDE | 0.27 | Hpmag | 5.6305 | E Hpmag | 0.0009 | ||||
SHp | 0.006 | VA | 0 | BV | 1.002 | E BV | 0.001 | ||||
VI | 0.98 |
Componente originario normalizzato | AB | Coord arcsec 2000 | 090935.55-084723.3 | Mag | 9.2 | Calc delta mag | 3.63 | ||||
Calc coord | yes |