NML Cygni
red hypergiant star in the constellation of Cygnus, possibly the largest star known by radius
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Summary
NML Cygni is an OH/IR star[1]. It draws 1,426 Wikipedia views per month (oh ir star category, ranking #1 of 2).[2]
Key Facts
- Instance of: red hypergiant[3], semiregular variable star[4], infrared source[5], near-infrared source[6]
- Constellation: Cygnus[7]
- Spectral class: M7-8[8], M6III:[9], M6III[10]
- Part of: Cygnus OB2[11]
- Commons category: NML Cygni[12]
- Catalog code: 2MASS J20462554+4006594[13], IRC +40448[14], JP11 5547[15], RAFGL 2650[16], V1489 Cyg[17], [LFO93] 2044+39[18], Gaia DR2 2065235853217670656[19], [TVH89] 432[20], Gaia DR3 2065235853217670656[21], TIC 66995250[22], AAVSO 2042+39[23]
- Type of variable star: semiregular variable star[24]
- Apparent magnitude: 16.60[25], 11.147657[26], 4.877[27], 2.389[28], 0.791[29]
- Luminosity: 229,000 solar luminosity[30]
- Mass: 50 solar mass[31]
- Radius: 1935 solar radius[32]
- Parallax: 0.62 milliarcsecond[33], 1.5259 milliarcsecond[34], 0.5279 milliarcsecond[35]
- Diameter: 2,700,000,000 km[36]
- Distance from Earth: 1610 parsec[37]
- Right ascension: 311.60641367462 degree[38]
- Declination: 40.11651785812 degree[39]
- Epoch: J2000.0[40]
- Effective temperature: 3300 K[41]
- Age estimated by a dating method: 8 megaannum[42]
- Declination component of proper motion: -4.59 milliarcsecond per year[43], -0.863 milliarcsecond per year[44], -5.595 milliarcsecond per year[45]
- Right ascension component of proper motion: -1.55 milliarcsecond per year[46], -0.268 milliarcsecond per year[47], -1.224 milliarcsecond per year[48]
Why It Matters
NML Cygni has Wikipedia articles in 25 language editions, a strong signal of global cultural recognition.[49] It is known by 14 alternative names across languages and contexts.[50]