About HD 28233
HD 28233 is a common variable star. It sits in the constellation Cae, shines at apparent magnitude 9.95 and has spectral type F2V.
Its spectrum reads F2V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Common variable star 17 EP
HD 28233
RA 66.4113° · Dec -38.0595° · star
Score breakdown
· 5 badgesCommon 22 pts → Uncommon
- Variable star +5
- Gently variable +4
- Yellow-white F-type star +3
- A named variable star +3
- Main-sequence star +2
Total score 17
5 more points to reach Uncommon.
Badges
- Variable star · +5
- Yellow-white F-type star · +3
- Main-sequence star · +2
- Gently variable · +4
- A named variable star · +3
Trivia
Hard to believe
- True brightness. It pours out about 895.4 thousand times as much light as the Sun. It only looks ordinary because it is so far away.
What it actually is
- Spectral class. Its spectrum reads F2V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
- Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.
- It changes. This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.
Find it in the sky
- How to spot it. At magnitude 9.9 you'll want a small backyard telescope, over in Caelum.
- Southern sky. It rides the southern half of the sky — an easier target the further south you are.
- Best time of year. It stands highest in the middle of the night around November — that's when to go looking.
Its true colour
- Its true colour. Measured through blue and visual filters it comes out yellow-white (B−V 0.5) — a shade brighter and crisper than our own Sun.
Properties
- absmag
- -10.05
- bv
- 0.474
- constellation
- Cae
- luminosity
- 912010.8394
- mag
- 9.95
- name
- HD 28233
- spect
- F2V
- var amplitude
- 0.25
- var designation
- RT
- var max
- 9.846
- var min
- 10.096
How to see it
Look for HD 28233 in the constellation Cae. At apparent magnitude 9.95, a small backyard telescope will bring it into view.
Like any astronomical target, HD 28233 is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.
Why HD 28233 is a common variable star
HD 28233 scores 17 points on Spacedle's rarity scale, which places it in the common tier. Another 5 points would lift it into a rarer tier.
That score comes from 5 science badges — Variable star, Yellow-white F-type star, Main-sequence star, Gently variable and A named variable star — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.