Calendar – Lyra

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Gamma Lyrae (γ Lyr)

Traditional Name Sulafat
Spectral Classification B9III (blue-white giant)
Right ascension 18^h 58^m 56.62241^s
Declination +32° 41' 22.4003"
Apparent magnitude 3.261 V
Mass 5 M
Radius 15 R
Luminosity 2,100 L
Temperature 10,080 K

Beta Lyrae (β Lyr)

Traditional Name Sheliak
Spectral Classification B6-8II (blue-white bright giant)
Right ascension 18^h 50^m 04.79525^s
Declination +33° 21' 45.6100"
Apparent magnitude 3.52 V
β Lyr A / β Lyr B
- Mass 13.16 ± 0.3 M / 2.97 ± 0.2 M
- Radius 6.0 ± 0.2 R / 15.2 ± 0.2 R
- Luminosity 26,300 L / 6,500 L
- Temperature 30,000 ± 2,000 K / 13,300 K

Delta² Lyrae (δ² Lyr)

Spectral Classification M4II (red bright giant)
Right ascension 18^h 54^m 30.2838^s
Declination 36° 53' 55.007"
Apparent magnitude 4.30 V
Mass 7.3 M
Radius 338 ± 43 R
Luminosity 18,000 ± 5,100 L
Temperature 3,600 ± 50 K

Zeta¹ Lyrae (ζ¹ Lyr)

Spectral Classification B9III (blue-white giant)
Right ascension 18^h 44^m 46.35735^s
Declination +37° 36' 18.4171"
Apparent magnitude 4.36 V
Mass 2.2 M
Radius 2.8 R
Luminosity 3,100 L
Temperature 8,000 K

Alpha Lyrae (α Lyr)

Traditional Name Vega
Spectral Classification A0V (blue-white dwarf)
Right ascension 18^h 36^m 56.33635^s
Declination +38° 47' 01.2802"
Apparent magnitude 0.03 V
Mass 2.135 ± 0.074 M
Radius 2.362 x 2.818 R
Luminosity 40.12 ± 0.45 L
Temperature 9,602 ± 180 K

Epsilon Lyrae (ε Lyr) [binary "double double"]

Epsilon¹ Lyrae / Epsilon² Lyrae
- Spectral Classification F1V (yellow-white dwarf) / A8V (white dwarf)
- Right ascension 18^h 44^m 20.3453^s / 18^h 44^m 22.7803^s
- Declination +39° 40' 12.444" / +39° 36' 45.798"
- Apparent magnitude 4.7 V / 5.1 V
- Mass 1.9 M / 1.9 M
- Radius 2 R / 2 R
- Luminosity 18,000 L / 17,000 L
- Temperature 7,800 K / 8,000 K

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