Mekbuda 소개
설명
Mekbuda, Zeta Geminorum, is a classical Cepheid variable — a yellow supergiant of spectral type G1 Ib that pulsates regularly between magnitudes 3.62 and 4.18 with a period of 10.15 days. It lies about 1,350 light-years away, and at maximum light it shines at roughly 3,000 solar luminosities. As a Cepheid, Mekbuda follows the period-luminosity relation that Henrietta Leavitt discovered in 1912 and that Edwin Hubble later used to measure galactic distances.
관측 팁
Mekbuda is an ideal naked-eye Cepheid project: compare its brightness to Lambda Gem (3.58) and Nu Gem (4.15) every clear night and you can construct its own light curve in a few weeks. The variation is a full half magnitude — easily detected by eye. Mekbuda marks the western knee of Pollux, the southern Gemini twin. Best observed December through May.
역사
The name comes from the Arabic "maqbūdah," meaning "the contracted" or "folded paw" — a pre-Islamic astronomical image of a lion's paw. The variability was discovered by Julius Schmidt in 1825. Mekbuda was one of the first Cepheid variables used to calibrate the period-luminosity relation: because it is close enough for accurate parallax measurement, it anchors the brightness scale that leads outward to other galaxies.
재미있는 사실
Mekbuda's radius physically changes by about 10 percent during each 10-day cycle — the star actually swells and contracts as it pulsates. The Hubble Space Telescope's fine-guidance sensors directly measured its parallax in 2002, providing an independent check on the cosmic distance ladder. Mekbuda is one of only a handful of Cepheids bright enough for naked-eye monitoring; amateur observers have contributed meaningful data on tiny period changes over decades.
관측
1물리적 특성
3변광 추적 난이도
| 장비 | 보틀 3 | 보틀 4 | 보틀 5 |
|---|---|---|---|
| 맨눈 맨눈 | 어려움+ | 어려움+ | 어려움 |
| 50mm 파인더 50mm 파인더 | 보통 | 보통 | 보통 |
| 150mm 망원경 150mm 망원경 | 보통 | 보통 | 보통 |
보틀 3 = 시골 · 4 = 외곽 · 5 = 교외
5서베이 이미지
서베이 이미지 로드 중…
6광도 곡선
탐구
9
크기 비교
10
별 비교
11
분광 분류
13
항성의 진화
14
흑체 복사 스펙트럼
15
항성 흡수 스펙트럼
스펙트럼 유형을 기반으로 한 시뮬레이션 흡수 스펙트럼. 선 위에 마우스를 올려 원소를 식별하세요.
16
항성 핵융합
발견
17항성 참고사항
18
빛의 여행 타임머신
19
상대론적 여행
하늘에서 가까운 천체
몇 도 이내의 다른 대상 — 망원경을 조금 움직여 계속 탐험해 보세요.
가시성 점수는 150 mm 뉴턴, 보틀 4 기준입니다.
Nightbase 살펴보기
관련된 지식, 도구, 이야기 — 관측 계획은 필요 없습니다.
