Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Camelopardalis |
Right ascension | 03h 59m 18.2863s [2] |
Declination | +57° 14′ 13.673″ [2] |
Apparent magnitude (V) | 9.80 - 10.15 [3] |
Characteristics | |
Spectral type | O6nn [4] (O6V((f)) + O6V((f)) [5]) |
U−B color index | −0.66 [4] |
B−V color index | +0.28 [4] |
Variable type | Ellipsoidal [3] |
Astrometry | |
Radial velocity (Rv) | −47 [1] km/s |
Proper motion (μ) |
RA: −2.3
[6]
mas/
yr Dec.: −0.3 [6] mas/ yr |
Parallax (π) | 0.1333 ± 0.0789 mas [7] |
Distance | ~4,000 [1] pc |
Absolute magnitude (MV) | −4.1 [4] |
Orbit [1] | |
Period (P) | 1.175 days |
Semi-major axis (a) | 19.24 R☉ |
Eccentricity (e) | 0 |
Inclination (i) | 62.59° |
Argument of periastron (ω) (secondary) | 90° |
Argument of periastron (ω) (primary) | 270° |
Semi-amplitude (K1) (primary) | 335 km/s |
Semi-amplitude (K2) (secondary) | 400 km/s |
Details [1] | |
A | |
Mass | 37.7 M☉ |
Radius | 7.60 R☉ |
Surface gravity (log g) | 4.251 cgs |
Temperature | 42,000 ± 1,500 K |
Rotational velocity (v sin i) | 290 km/s |
B | |
Mass | 31.6 M☉ |
Radius | 7.01 R☉ |
Surface gravity (log g) | 4.245 cgs |
Temperature | 39,000 ± 1,500 K |
Rotational velocity (v sin i) | 268 km/s |
Other designations | |
MY Camelopardalis,
BD+56°864,
Alicante 1 NM 693,
2MASS J03591829+5714137, Gaia DR2 469715181320008960 | |
Database references | |
SIMBAD | data |
MY Camelopardalis (MY Cam) is a binary star system located in the Alicante 1 open cluster, some 13 kly (4.0 kpc) away in the constellation Camelopardalis. It is one of the most massive known binary star systems and a leading candidate for a massive star merger. MY Cam is the brightest star in Alicante 1. [1]
The system consists of two hot blue O-type stars with one component having a mass of 32 solar masses and the other 38 solar masses. MY Cam is a contact binary and eclipsing binary, with an orbital period of 1.2 days, and an orbital velocity of 1,000,000 km/h (280 km/s; 620,000 mph). [1] Both stars share a common envelope. [1]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Camelopardalis |
Right ascension | 03h 59m 18.2863s [2] |
Declination | +57° 14′ 13.673″ [2] |
Apparent magnitude (V) | 9.80 - 10.15 [3] |
Characteristics | |
Spectral type | O6nn [4] (O6V((f)) + O6V((f)) [5]) |
U−B color index | −0.66 [4] |
B−V color index | +0.28 [4] |
Variable type | Ellipsoidal [3] |
Astrometry | |
Radial velocity (Rv) | −47 [1] km/s |
Proper motion (μ) |
RA: −2.3
[6]
mas/
yr Dec.: −0.3 [6] mas/ yr |
Parallax (π) | 0.1333 ± 0.0789 mas [7] |
Distance | ~4,000 [1] pc |
Absolute magnitude (MV) | −4.1 [4] |
Orbit [1] | |
Period (P) | 1.175 days |
Semi-major axis (a) | 19.24 R☉ |
Eccentricity (e) | 0 |
Inclination (i) | 62.59° |
Argument of periastron (ω) (secondary) | 90° |
Argument of periastron (ω) (primary) | 270° |
Semi-amplitude (K1) (primary) | 335 km/s |
Semi-amplitude (K2) (secondary) | 400 km/s |
Details [1] | |
A | |
Mass | 37.7 M☉ |
Radius | 7.60 R☉ |
Surface gravity (log g) | 4.251 cgs |
Temperature | 42,000 ± 1,500 K |
Rotational velocity (v sin i) | 290 km/s |
B | |
Mass | 31.6 M☉ |
Radius | 7.01 R☉ |
Surface gravity (log g) | 4.245 cgs |
Temperature | 39,000 ± 1,500 K |
Rotational velocity (v sin i) | 268 km/s |
Other designations | |
MY Camelopardalis,
BD+56°864,
Alicante 1 NM 693,
2MASS J03591829+5714137, Gaia DR2 469715181320008960 | |
Database references | |
SIMBAD | data |
MY Camelopardalis (MY Cam) is a binary star system located in the Alicante 1 open cluster, some 13 kly (4.0 kpc) away in the constellation Camelopardalis. It is one of the most massive known binary star systems and a leading candidate for a massive star merger. MY Cam is the brightest star in Alicante 1. [1]
The system consists of two hot blue O-type stars with one component having a mass of 32 solar masses and the other 38 solar masses. MY Cam is a contact binary and eclipsing binary, with an orbital period of 1.2 days, and an orbital velocity of 1,000,000 km/h (280 km/s; 620,000 mph). [1] Both stars share a common envelope. [1]