| Object : | Beta Cephei or Alfirk |
| Coordinates/Direction : | RA: 21h28m, DEC: +70o33' |
| Object size : | Double star and variable |
| Object magnitude : | 3.16 - 3.27 |
| More to know : |
Double Star, Wikipedia:
https://en.wikipedia.org/ wiki/ Double star
Variable Star, Wikipedia:
https://en.wikipedia.org/ wiki/ Variable_star
Beta Cephei:
https://en.wikipedia.org/ wiki/ Beta_Cephei
https://en.wikipedia.org/ wiki/ Beta_Cephei_variable
|
| Exp. time : | 102x60 seconds, iso1600, dithering mode |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | synthetic bias, flat, photometric color calibration |
| Weather : | some clouds, full Moon, temperature +9 C |
| Comment : |
Not so many objects in the field I have a clear sky to this night.
I concentrated me on a star. The beta Cephei, part of the constellation Cepheus.
The star is bright, magnitude 3, this cause oversaturation of it, that's why it get these strange colors.
What's a bit special is that it's a triple star and a variable.
The two main stars has the name Beta Cephei Aa and the third Ab.
The two main stars has the name Alfirk too.
It has a very short variable time, only hours.
If I had taken photos of the star I maybe could see or measure this variation.
At least at times when the variations is big, 0.3 magnitudes.
They are at a distance of 690 ly and could not be separated.
The area around the star is relative empty, partly because it looks like that with my heavy light polluted sky.
Here is a plate solve of the surroundings:
Beta Cephei, by Astrometry.net.
Next day I took down the telescope, the season is sadly over now. |
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