Coord 2000 | 00491+5749 |
Discov num | STF 60 |
Comp | AB |
Coord arcsec 2000 | 00 49 06.29 +57 48 54.7 |
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Date first | 1779 |
Date last | 2020 |
Obs | 1084 |
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Pa first | 62 |
Pa last | 326 |
P.A. Now (θ) | 326.7° |
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Sep first | 11.3 |
Sep last | 13.6 |
Sep. Now (ρ) | 13.43" |
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Mag pri | 3.52 |
Mag sec | 7.36 |
delta mag (ΔM) | 3.84 |
Spectral class | G1V+M (yellow/red) |
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Pri motion ra | +114 |
Sec motion ra | +111 |
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Pri motion dec | -057 |
Sec motion dec | -049 |
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Notes |
Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current |
Show | Achird | 21732 | 00 49 06 +57 48 55 | STF 60 AB | 2020 | 1084 | 327 | 13.4 | 3.52 | 7.36 | 3.84 | Y | <=== |
Show | 21732 | 00 49 06 +57 48 55 | STF 60 AC | 2000 | 4 | 260 | 225.0 | 3.52 | 11.40 | 7.88 | |||
Show | 21732 | 00 49 06 +57 48 55 | STF 60 AD | 2011 | 7 | 354 | 189.4 | 3.52 | 12.80 | 9.28 | |||
Show | 21732 | 00 49 06 +57 48 55 | STF 60 AE | 2015 | 24 | 126 | 75.6 | 3.52 | 10.15 | 6.63 | |||
Show | 21732 | 00 49 06 +57 48 55 | STF 60 AF | 2000 | 3 | 276 | 378.3 | 3.52 | 11.53 | 8.01 | |||
Show | 21732 | 00 49 06 +57 48 55 | STF 60 AG | 2012 | 19 | 259 | 419.7 | 3.52 | 9.53 | 6.01 | |||
Show | 21732 | 00 49 06 +57 48 55 | STF 60 AH | 2012 | 4 | 355 | 701.1 | 3.52 | 8.41 | 4.89 | |||
Show | 21732 | 00 49 06 +57 48 55 | SMR 2 AI | 2012 | 7 | 73 | 90.3 | 3.52 | 11.60 | 8.08 | |||
Show | 21732 | 00 49 06 +57 48 55 | SMR 2 AJ | 2012 | 5 | 262 | 237.1 | 3.52 | 12.30 | 8.78 | |||
Show | 21732 | 00 49 05 +57 49 04 | STF 60 BC | 2000 | 4 | 257 | 218.7 | 7.36 | 11.40 | 4.04 | |||
Show | 21732 | 00 49 05 +57 49 04 | STF 60 BD | 2000 | 1 | 1 | 172.2 | 7.36 | 12.80 | 5.44 | |||
Show | 21732 | 00 49 05 +57 49 04 | STF 60 BE | 2020 | 4 | 126 | 105.5 | 7.36 | 10.15 | 2.79 | |||
Show | 21732 | 00 49 05 +57 49 04 | STF 60 BF | 2000 | 2 | 275 | 369.1 | 7.36 | 11.53 | 4.17 | |||
Show | 21732 | 00 49 05 +57 49 04 | STF 60 BG | 2000 | 2 | 254 | 404.0 | 7.36 | 9.53 | 2.17 | |||
Show | 21732 | 00 49 05 +57 49 04 | STF 60 BH | 2020 | 5 | 355 | 688.4 | 7.36 | 8.41 | 1.05 | |||
Show | 00 48 19 +57 49 34 | STF 60 FG | 2015 | 10 | 188 | 142.2 | 11.53 | 9.53 | 2.00 |
Precise pa | 326.3 |
Precise sep | 13.57 |
Common name | Achird |
Other names | MARFAK |
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Constellation | Cassiopeia |
SAO | 21732 |
HIP | 3821 |
Tycho2 | 3663-02669-1 |
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HD | 4614 |
HR | 219 |
GC | 962 |
ADS | 671 |
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GL | Gl 34A |
BD | BD+57 150 |
Bayer | Eta Cassiopeiae |
Bayer name | Eta Cas |
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Flamsteed | 24 Cassiopeiae |
Flamsteed name | 24 Cas |
Distance | 5.95 |
Distance ly | 19.41 |
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last precise pa | 326.3 |
last precise sep | 13.57 |
Period (P) | 479.27y | Periastron (T) | 1889.93y | Semi-major axis (a) | 12.04a | |||
Eccentricity (e) | 0.497 | Inclination (i) | 35.6° | Longitude of periastron (ω) | 269.8° | |||
Node (Ω) | 278° | Note | Grade | 3 | (1=Definitive, 9=Indet.) | |||
Equinox | 2000 | Last observation | 2014 |
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st. |
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![]() Measures: green=micrometric, blue=interferometric, purple=photographic |
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coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | notes | coord_arcsec_2000 |
00491+5749 | STF 60 | AB | 2007 | 1033 | 320 | 13.0 | 3.52 | 7.36 | G0V dM0 | NODP | 004905.10+574859.6 |
00491+5749 | STF 60 | AB | 2008 | 1036 | 323 | 13.0 | 3.52 | 7.36 | G0V dM0 | NODP | 004905.10+574859.6 |
00491+5749 | STF 60 | AB | 2009 | 1043 | 322 | 13.1 | 3.52 | 7.36 | G0V dM0 | NODP | 004905.10+574859.6 |
00491+5749 | STF 60 | AB | 2010 | 1044 | 322 | 13.2 | 3.52 | 7.36 | G0V dM0 | NODP | 004905.10+574859.6 |
00491+5749 | STF 60 | AB | 2011 | 1045 | 321 | 13.2 | 3.52 | 7.36 | G0V dM0 | NODP | 004905.10+574859.6 |
00491+5749 | STF 60 | AB | 2013 | 1056 | 324 | 13.3 | 3.52 | 7.36 | G0V dM0 | NODP | 004905.14+574859.4 |
00491+5749 | STF 60 | AB | 2014 | 1061 | 324 | 12.8 | 3.52 | 7.36 | G1V+M | NODP | 004905.14+574859.4 |
00491+5749 | STF 60 | AB | 2015 | 1063 | 325 | 13.7 | 3.52 | 7.36 | G1V+M | NO P | 004905.14+574859.4 |
00491+5749 | STF 60 | AB | 2016 | 1069 | 324 | 12.9 | 3.52 | 7.36 | G1V+M | NO P | 004906.29+574854.7 |
00491+5749 | STF 60 | AB | 2018 | 1079 | 327 | 13.5 | 3.52 | 7.36 | G1V+M | NO P | 004906.29+574854.7 |
00491+5749 | STF 60 | AB | 2019 | 1081 | 326 | 13.4 | 3.52 | 7.36 | G1V+M | NO P | 004906.29+574854.7 |