Tarfについて
説明
Tarf, Beta Cancri, is a K-type giant of spectral class K4 III with a weak s-process (barium) chemical anomaly, located 303 light-years away. It is the brightest star in the faint zodiac constellation Cancer, shining at magnitude 3.52. Tarf hosts a confirmed exoplanet, Beta Cancri b, a super-Jupiter in a 605-day orbit discovered in 2014.
観測のコツ
Tarf is the brightest star in Cancer — but that is no high bar, since Cancer's other stars are all fainter than magnitude 3.9. Tarf lies in the southwestern corner of the constellation, southeast of Castor and Pollux. Its warm orange-red color is obvious in binoculars. Best observed January through May.
歴史
The name Tarf comes from the Arabic "al-ṭaraf," meaning "the edge" or "end" — referring to the tip of one of the crab's legs. The IAU adopted the name in 2014. The exoplanet was announced the same year.
豆知識
Tarf's barium enrichment is the signature of past mass transfer from a companion that has since evolved into a white dwarf. Tarf b at 1.7 AU orbits beyond the zone that would have been engulfed during the star's giant-branch evolution, suggesting it formed at its current location or migrated outward during the giant phase.
観測
1物理的性質
3見つけやすさ
| 機材 | ボートル3 | ボートル4 | ボートル5 |
|---|---|---|---|
| 肉眼 肉眼 | 容易 | 容易 | 普通+ |
| 50mmファインダー 50mmファインダー | 容易 | 容易 | 容易 |
| 150mm望遠鏡 150mm望遠鏡 | 容易 | 容易 | 容易 |
ボートル3＝田舎 · 4＝郊外 · 5＝住宅地
5サーベイ画像
サーベイ画像を読み込み中…
探究
7
サイズ比較
8
恒星を比較
9
スペクトル分類
11
恒星の進化
12
黒体放射スペクトル
13
恒星吸収スペクトル
スペクトル型に基づくシミュレーション吸収スペクトル。線にマウスを合わせると元素を識別できます。
14
恒星核融合
15
Exoplanets
1 known planet
View in 3D
| Planet | Radius | Mass | Period | Distance |
|---|---|---|---|---|
| bet Cnc b | 12.60R⊕ | 7.80M♃ | 1.7yr | 290ly |
Habitable Zone
Size & Mass Comparison
About exoplanets — how we find them and which host stars you can observe
発見
16恒星メモ
17
光の旅タイムマシン
18
相対論的旅行
近くの天体
数度以内にある他の対象 — 望遠鏡を少し動かして探索を続けましょう。
可視性スコアは150 mmニュートン・ボートル4を前提としています。
Nightbase を探す
関連する知識・ツール・物語 — 観測計画は不要です。
