Tau Serpentis

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The Bayer designation Tau Serpentis (τ Ser / τ Serpentis) is shared by a collection of eight stars, τ1 Serpentis through τ8 Serpentis, in the head of the constellation Serpens. They are distributed within a box of size 40 minutes in right ascension by 3.5° in declination. They are numbered by increasing right ascension.


Contents

[edit] τ1 Serpentis

τ1 Serpentis
Observation data
Epoch J2000.0
Constellation
(pronunciation)
Serpens
Right ascension 15h 25m 47.4s
Declination +15° 25' 41"
Apparent magnitude (V) +5.16
Distance 920 ± 200 ly
(280 ± 60 pc)
Spectral type M1III
Other designations
9 Serpentis, HR 5739,
HD 137471, SAO 101545,
HIP 75530

Tau-1 Serpentis is a red M-type giant with an apparent magnitude of +5.16. It is approximately 920 light years from Earth.


[edit] τ2 Serpentis

τ2 Serpentis
Observation data
Epoch J2000.0
Constellation
(pronunciation)
Serpens
Right ascension 15h 32m 09.7s
Declination +16° 03' 22"
Apparent magnitude (V) +6.22
Distance 431 ± 46 ly
(132 ± 14 pc)
Spectral type B9V
Other designations
12 Serpentis, HR 5770,
HD 138527, SAO 101600,
HIP 76069

Tau-2 Serpentis is a blue-white B-type main sequence dwarf with an apparent magnitude of +6.22. It is approximately 431 light years from Earth.


[edit] τ3 Serpentis

τ3 Serpentis
Observation data
Epoch J2000.0
Constellation
(pronunciation)
Serpens
Right ascension 15h 35m 33.2s
Declination +17° 39' 20"
Apparent magnitude (V) +6.10
Distance 414 ± 46 ly
(127 ± 14 pc)
Spectral type G8III:
Other designations
15 Serpentis, HR 5795,
HD 139074, SAO 101631,
HIP 76337

Tau-3 Serpentis is a yellow G-type giant with an apparent magnitude of +6.10. It is approximately 414 light years from Earth.


[edit] τ4 Serpentis

τ4 Serpentis
Observation data
Epoch J2000.0
Constellation
(pronunciation)
Serpens
Right ascension 15h 36m 28.3s
Declination +15° 06' 05"
Apparent magnitude (V) +6.51
Distance 520 ± 83 ly
(159 ± 25 pc)
Spectral type M5II-III
Other designations
17 Serpentis, HIP 76423

Tau-4 Serpentis is a red M-type bright giant with a mean apparent magnitude of +6.51. It is approximately 520 light years from Earth. It is classified as a semiregular late-type variable star, and its magnitude varies between +5.89 and +7.07 with a period of approximately 100 days.


[edit] τ5 Serpentis

τ5 Serpentis
Observation data
Epoch J2000.0
Constellation
(pronunciation)
Serpens
Right ascension 15h 36m 29.3s
Declination +16° 07' 08"
Apparent magnitude (V) +5.93
Distance 160 ± 6 ly
(49 ± 2 pc)
Spectral type F3V
Other designations
18 Serpentis, HR 5804,
HD 139225, SAO 101642,
HIP 76424

Tau-5 Serpentis is a yellow-white F-type main sequence dwarf with an apparent magnitude of +5.93. It is approximately 160 light years from Earth.


[edit] τ6 Serpentis

τ6 Serpentis
Observation data
Epoch J2000.0
Constellation
(pronunciation)
Serpens
Right ascension 15h 40m 59.2s
Declination +16° 01' 29"
Apparent magnitude (V) +6.00
Distance 451 ± 49 ly
(138 ± 15 pc)
Spectral type G8III
Other designations
19 Serpentis, HR 5840,
HD 140027, SAO 101678,
HIP 76810

Tau-6 Serpentis is a yellow G-type giant with an apparent magnitude of +6.00. It is approximately 451 light years from Earth. It is a member of the Ursa Major Stream.


[edit] τ7 Serpentis

τ7 Serpentis
Observation data
Epoch J2000.0
Constellation
(pronunciation)
Serpens
Right ascension 15h 41m 54.7s
Declination +18° 27' 50"
Apparent magnitude (V) +5.80
Distance 174 ± 8 ly
(53 ± 2 pc)
Spectral type A2m
Other designations
22 Serpentis, HR 5845,
HD 140232, SAO 101686,
HIP 76878

Tau-7 Serpentis is a white A-type star with an apparent magnitude of +5.80. It is approximately 174 light years from Earth.


[edit] τ8 Serpentis

τ8 Serpentis
Observation data
Epoch J2000.0
Constellation
(pronunciation)
Serpens
Right ascension 15h 44m 42.1s
Declination +17° 15' 51"
Apparent magnitude (V) +6.15
Distance 321 ± 25 ly
(98 ± 8 pc)
Spectral type A0V
Other designations
26 Serpentis, HR 5858,
HD 140729, SAO 101712,
HIP 77111

Tau-8 Serpentis is a white A-type main sequence dwarf with an apparent magnitude of +6.15. It is approximately 321 light years from Earth.