阿貝爾7
| 發射星雲 | |
|---|---|
| 行星状星云 | |
 | |
| 觀測資料: J2000 epoch | |
| 赤经 | 05h 03m 07.53s[1][2] |
| 赤纬 | -15° 36′ 22.7″[1][2] |
| 距離 | 1.8 kly (0.55 kpc) 光年 |
| 视星等 (V) | Integrated: 12.2–14.3;[3] Central star: 15.4[2] |
| 視尺度(V) | 12.733′ × 12.733′[1][2] |
| 星座 | 天兔座 |
| 物理性質 | |
| 半径 | 8 ly (2.5 pc) ly |
| 值得注意的特徵 | Simple spherical shape |
| 名稱 | PK 215-30.1, PN G 215.5-30.8 |
阿貝爾7（Abell 7）是一個暗淡的行星狀星雲，位於天兔座，距離地球1800光年。
阿貝爾7大致呈球形，直徑約8光年。球體內部有複雜的細節，可以透過窄帶濾波器呈現。根據天文學家估計，阿貝爾7只有2萬年歷史，但其中心恆星：一顆黯淡的白矮星的年齡估計約為100億年[3][4][5]。
參考資料
[编辑]- ^ 1.0 1.1 1.2 SIMBAD, Results for PN A66 07, SIMBAD, Centre de Données Astronomiques de Strasbourg, 4 August 2014
- ^ 2.0 2.1 2.2 2.3 The Complete Abell Catalog of Planetary Nebulae. Astronomy Mall. [2014-08-04].
MAG1 = Integrated VMag of PN / MAG2 = Mag of Central Star / SIZE = Diameter in arcminutes — ABELL:07 CON: LEP PNG# / OTHER: 215.5-30.8 MAG1: 13.2 MAG2: 15.4 SIZE: 12.7 RA: 05 03 07.5 DEC: -15 36 23 URA2: 137
- ^ 3.0 3.1 Abell, George O., Properties of Some Old Planetary Nebulae, Astrophysical Journal, April 1966, 144: 259, Bibcode:1966ApJ...144..259A, doi:10.1086/148602
- ^ APOD, Robert J. Nemiroff (MTU); Jerry Bonnell (USRA) , 编, Abell 7, NASA, 5 December 2013,
Very faint planetary nebula Abell 7 is some 1,800 light-years distant, just south of Orion in planet Earth's skies in the constellation Lepus, The Hare. Surrounded by Milky Way stars and near the line-of-sight to distant background galaxies, its generally simple spherical shape, about 8 light-years in diameter, is outlined in this deep telescopic image. ... Abell 7 itself is estimated to be 20,000 years old. Its central star is seen here as a fading white dwarf some 10 billion years old.
- ^ Abell, George O., Globular Clusters and Planetary Nebulae Discovered on the National Geographic Society-Palomar Observatory Sky Survey, Publications of the Astronomical Society of the Pacific, 1955, 67 (397): 258, Bibcode:1955PASP...67..258A, doi:10.1086/126815
