Alpha Lacertae
| Data pengamatan Epos J2000.0 Ekuinoks J2000.0 (ICRS) | |
|---|---|
| Rasi bintang | Lacerta |
| Asensio rekta | 22j 31m 17.5010d[1] |
| Deklinasi | +50° 16′ 56.969″[1] |
| Magnitudo tampak (V) | 3.777[1] |
| Ciri-ciri | |
| Kelas spektrum | A1V[1] |
| Indeks warna U−B | 0.00[2] |
| Indeks warna B−V | +0.01[2] |
| Indeks warna R−I | −0.03[2] |
| Astrometri | |
| Kecepatan radial (Rv) | −4.0 ± 2[1] km/s |
| Gerak diri (μ) | RA: 137.22[1] mdb/thn Dek.: 17.15[1] mdb/thn |
| Paralaks (π) | 31,86±0,54[1] mdb |
| Jarak | 102 ± 2 tc (31,4 ± 0,5 pc) |
| Magnitudo mutlak (MV) | 1.29[3] |
| Detail | |
| Massa | ~2[4] M☉ |
| Radius | 1.9[5] R☉ |
| Luminositas (bolometrik) | 27[4] L☉ |
| Suhu | 9200[4] K |
| Kecepatan rotasi (v sin i) | 146[2] km/s |
| Penamaan lain | |
| Referensi basis data | |
| SIMBAD | data |
Alpha Lacertae (Alpha Lac / α Lacertae / α Lac) adalah bintang tipe A di rasi Lacerta.[1] Bintang ini merupakan bintang yang paling cerah di rasi ini (bermagnitudo) 3.76.[1][4] Jarak dari Bumi ke bintang ini adalah 102 tahun cahaya dari Bumi.
Etimologi
Nama lainnya untuk bintang ini adalah:
| nama lain | asal bahasa | arti |
|---|---|---|
| 螣蛇一 / Téngshéyī | China | bintang pertama pada rasi Ular Terbang[7] |
Selain rasi Lacerta, bintang ini juga merupakan anggota dari berbagai rasi atau asterisma berikut:
| nama rasi / asterisma | asal | arti | anggota lainnya |
|---|---|---|---|
| 螣蛇 / Téngshé | China | Ular Terbang | 4 Lac, π2 Cyg, π1 Cyg, HD 206267, ε Cep, β Lac, σ Cas, ρ Cas, τ Cas, AR Cas, 9 Lac, 3 And, 7 And, 8 And, λ And, ψ And, κ And, ι And |
| Little Cassiopeia | 5 Lac, β Lac, 2 Lac, 4 Lac |
Komponen visual
| Data pengamatan Epos J2000.0 Ekuinoks J2000.0 (ICRS) | |
|---|---|
| Rasi bintang | Lacerta |
| Asensio rekta | 22j 31m 13.2d[8] |
| Deklinasi | +50° 17′ 09″[8] |
| Magnitudo tampak (V) | 11.8[8] |
| Ciri-ciri | |
| Kelas spektrum | A5[8] |
| Indeks warna B−V | 0.0[8] |
| Posisi (relatif ke α Lacertae) | |
| Epoch pengamatan | 1925 |
| Jarak sudut | 36.3″ [6] |
| Sudut posisi | 294° [6] |
| Penamaan lain | |
| Referensi basis data | |
| SIMBAD | data |
Bintang ini memiliki komponen visual, CCDM J22313+5017B, bertipe A dan bermagnitudo 11.8, berada pada jarak 36 arcsecond dari komponen utamanya.[6][8]
Referensi
- ^ a b c d e f g h i j k l * alf Lac -- Star in double system, database entry, SIMBAD. Accessed on line September 3, 2008.
- ^ a b c d HR 8585, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 3, 2008.
- ^ From apparent magnitude and parallax.
- ^ a b c d Alpha Lac, Jim Kaler, Stars. Accessed on line September 3, 2008.
- ^ HD 213558, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line September 3, 2008.
- ^ a b c d e Entry 22313+5017, discoverer code BU 703, The Washington Double Star Catalog Diarsipkan 2008-09-08 di Wayback Machine., United States Naval Observatory. Accessed on line September 3, 2008.
- ^ salah satu rasi bintang menurut bangsa Cina
- ^ a b c d e f BD+49 3875B -- Star in double system, database entry, SIMBAD. Accessed on line September 3, 2008.
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