Tulip Nebula (Cederblad 173, Sh 2-101)

Sharpless 2-101 (Cederblad 173)
Sharpless 2-101 (Cederblad 173): Section of STScI/NASA Digitized Sky Survey 2 (DSS2) [147]


In 1946 the Swedish astronomer Sven Cederblad published a study of bright diffuse galactic nebulae where he listed this nebula as Cederblad 173. He noted: «BD +34°3828 nebulous. Source: (93 Pl 43). WP 154. (715). R. The star responsible for the nebular light is stated to be BD +34°3828 (93). Then, BD +34°3830 = HD 189688 (spectrum K5) would only be aligned with the nebula.» [130]

In 1953 the American astronomer Stewart Sharpless published his first survey for H II regions on the 48 inch Schmidt telescope photo plates of the «Palomar Observatory Sky Survey». This nebula was listed as Sh 1-75. [309] In 1959 he published a revised and extended version of his survey and listed this nebula as Sh 2-101. [310]

In 1955 the Russian astronomers Grigory Abramovich Shajn and Vera Fedorovna Gaze at the Simeis Observatory on the Crimean Peninsula published their Gaze-Shajn catalogue of emission nebula. Cederblad 173 was there listed as Gaze-Shajn 175. [402]

In Beverly Lynds «Catalogue of Bright Nebulae», which was published in 1965, this nebula is listed as LBN 71.58+02.86. Because it was the 168th entry in the list, the nebula is also referred to as LBN 168. [270]

As the nebula appears in photographs like the bloom of a tulip, it earned the nickname «Tulip Nebula.»

Physical Properties

Data from Simbad [145]
Designations Sh 2-101, Ced 173, LBN 168, LBN 71.58+02.86
Right Ascension (J2000.0) 19 59 55.0
Declination (J2000.0) +35 16 36

Finder Chart

The nebula Sh 2-101 is located in the constellation Cygnus. The best time for observation is from March to December.

Finder Chart Tulip Nebula (Cederblad 173, Sh 2-101)
Tulip Nebula (Cederblad 173, Sh 2-101) in constellation Cygnus. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

Objects Within a Radius of 15°