Sao Ngưu Lang vs sao Chức Nữ
| Property |
Sao Ngưu Lang |
sao Chức Nữ |
| Ký Hiệu |
53Alp Aql |
3Alp Lyr |
| Chòm Sao |
Aquila |
Lyra |
| Phân Loại Quang Phổ |
Class A — A-type (White) |
Class A — A-type (White) |
| Cấp Sao Biểu Kiến |
+0.76 |
+0.03 |
| Cấp Sao Tuyệt Đối |
2.21 |
0.60 |
| Khoảng Cách |
16.7 ly |
25.0 ly |
| Khối Lượng |
N/A |
N/A |
| Bán Kính |
N/A |
N/A |
| Nhiệt Độ |
N/A |
N/A |
| Độ Sáng |
N/A |
N/A |
Key Differences
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Both are A-type stars forming part of the Summer Triangle asterism along with Deneb.
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Vega is at 25 light-years; Altair is even closer at 16.7 light-years.
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Altair rotates extremely rapidly (once every 10.4 hours), making it noticeably oblate; Vega also rotates fast but less extremely.
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Vega is about four times more luminous than Altair.
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Vega has a prominent debris disk suggesting possible planetary formation; Altair's disk is less prominent.