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.
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[edit] τ1 Serpentis
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | 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 | |
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
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | 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 | |
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
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | 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 | |
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
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | 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 | |
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17 Serpentis, HIP 76423
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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
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | 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 | |
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
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | 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 | |
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
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | 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 | |
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
| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | 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 | |
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.
