About HD 19510
HD 19510 is an uncommon variable star. It sits in the constellation Ari, shines at apparent magnitude 9.81 and has spectral type F0.5.
Its spectrum reads F0.5 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Uncommon variable star 24 EP
HD 19510
RA 47.1287° · Dec 10.4459° · star
Score breakdown
· 5 badgesUncommon 34 pts → Rare
- Strongly variable +10
- Variable star +5
- On the zodiac +3
- Yellow-white F-type star +3
- A named variable star +3
Total score 24
10 more points to reach Rare.
Badges
- Variable star · +5
- On the zodiac · +3
- Yellow-white F-type star · +3
- Strongly variable · +10
- A named variable star · +3
Trivia
Hard to believe
- True brightness. It pours out about 1 million 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 F0.5 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
- 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 9.8 you'll want a small backyard telescope, over in Aries.
- Northern sky. It rides the northern half of the sky — an easier target the further north 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.
- Why no green stars. No star ever looks green: a surface hot enough to peak in green also floods out plenty of red and blue, and your eye blends the mixture back to white.
Properties
- absmag
- -10.19
- bv
- 0.473
- constellation
- Ari
- luminosity
- 1037528.4158
- mag
- 9.81
- name
- HD 19510
- spect
- F0.5
- var amplitude
- 0.93
- var designation
- X
- var max
- 8.987
- var min
- 9.917
How to see it
Look for HD 19510 in the constellation Ari. At apparent magnitude 9.81, a small backyard telescope will bring it into view.
Like any astronomical target, HD 19510 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 19510 is an uncommon variable star
HD 19510 scores 24 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 10 points would lift it into a rarer tier.
That score comes from 5 science badges — Variable star, On the zodiac, Yellow-white F-type star, Strongly 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.