RCW 105

RCW 105 is an emission nebula (H II region) in Norma

RCW 105 is an emission nebula (H II region) in the constellation Norma. spans 45′. It is a telescope object, 6 inches or larger, and it is highest in the evening sky in July.

Nebula: a cloud of gas and dust. Emission nebulae glow on their own, lit by ultraviolet light from hot young stars; reflection nebulae shine by starlight scattered from dust; dark nebulae block the light behind them.

RCW 105 is RCW 105 in the RCW catalog of southern H-alpha regions

A. W. Rodgers, C. T. Campbell and J. B. Whiteoak listed it in their catalog of H-alpha emission regions in the southern Milky Way (1960), from photographs taken at Mount Stromlo Observatory.

Finding RCW 105 from γ Lup

RCW 105 lies 10.0° southeast of γ Lup, the magnitude 2.8 star. A fist held at arm's length covers about 10°.

RCW 105 is highest in the evening in July

The chart gives its height above the horizon at 9 pm through the year, from 60°N to 40°S. It can be seen from the whole southern hemisphere and north to about 41°N, and never sets south of 41°S.

The distance to RCW 105 is not well measured

Objects within 6° of RCW 105

• RCW 103, supernova remnant, 2.2°
• RCW 106, emission nebula (H II region), 2.5°
• RCW 102, emission nebula (H II region), 3.1°
• RCW 104, emission nebula (H II region), 3.3°
• RCW 107, emission nebula (H II region), 4.1°
• RCW 99, emission nebula (H II region), 4.9°
• C82, open cluster, 5.2°
• RCW 98 Coffee Bean Nebula, emission nebula (H II region), 6.0°

RCW 105 catalog data