Elias 2-27

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Coordinates: Sky map 16h 26m 45.025s, -2423° 07.75′ 430″

Elias 2-27
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ophiuchus
Right ascension  16h 26m 45.025s[1]
Declination −24° 23′ 07.75″[1]
Apparent magnitude (V) 13.32[1]
Spectral type M0[1]
Distance450 ly
(140[2] pc)
Other designations
2MASS J16264502-2423077[1]
Database references

Elias 2-27 (2MASS J16264502-2423077)[1] is a YSO star[1] with a protoplanetary disc around it, located in the Ophiuchus Molecular Cloud (ρ Oph Cld, 5 Oph Cld, Ophiuchus Dark Cloud), a star-forming region in the Ophiuchus constellation, some 450 light-years (140 parsecs) away. This star system became the first ever observed with density waves in the disc, giving it a spiral structure. Elias 2-27 is located near the double star Rho Ophiuchi (5 Ophiuchi).[3][2]


Protoplanetary disk surrounding the young star Elias 2-27, located some 450 light years away.[4]

In 2016, it was discovered that disc perturbations from density waves organized the disc debris into a pinwheel strcuture, with sweeping spiral arms; using observations from the Atacama Large Millimeter Array (ALMA) radio telescope. This marks the first instance of such an observation in a protoplanetary disc, though they have been previously predicted. The spiral arms start at 100 AU (9.3×109 mi; 1.5×1010 km) and extend out to 300 AU (2.8×1010 mi; 4.5×1010 km).[5][3]

Further reading[edit]

  • Laura M. Pérez; et al. (30 September 2016). "Spiral density waves in a young protoplanetary disk". Science. 353 (6307): 1519–1521. arXiv:1610.05139. Bibcode:2016Sci...353.1519P. doi:10.1126/science.aaf8296.