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GREAT NEBULA IN ORION OBSERVED BY THE D. O. MILLS EXPEDITION

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V +17.7

N.G.C. 2029. a = 5h 3^6; 8 = —67° 39'; A = 332° 18'; y3 = —87° 23' Extended nebula with 11.5 mag. star near center. Nebulosity brightest as indicated in drawing, figure 23. May possibly be very large ring nebula. Nearly as large as N.G.C. 2070, but much fainter, about 11 mag. Diameter 4'. The N, line alone, and that very faintly, was recorded on each of the three spectrograms and the three observed velocities are discordant. It is in the Greater Magellanic Cloud.

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N.G.C. 2070. 30 Doradus; extended, diagonal finder; composed is loop-shaped, while two brightness with the loop

Gr. M. T. Exp. Dispersion

1914 Dec. 21.74 5.3" 2-pr. 8-in.

1915 Jan. 3.71 5.8 2-pr. 8-in. Jan. 4.69 6.0 2-pr. 8-in. Dec. 20.21 13.3 2-pr. 8-in.

a = 5h 39*4 ; 8 = —69° 9'; A = 304° 22'; /3 = —86° 45' over 5' in diameter, covering considerably more than the field of the of stars and nebulosity; mag. 6th. The brighter part of the nebula other portions surrounding 8th-9th mag. stars are comparable in It is located in the Greater Magellanic Cloud.

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N.G.C. 2079. a = 5* 40m6; 8 = —69° 49'; A = 296° 38'; / 3 = —86° 16' Round, planetary, diameter 12". Field quite flat, although there is a trace of a nucleus on the following edge. One of the nebulae of the Greater Magellanic Cloud.

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Neb. . . . o = 5h41'?0; 8 = 69° 43'; A = 296° 59'; / 3 = — 86° 22' Small round planetary, about 7" in diameter and uniformly brighter towards center; has 10.5 mag. star 12" south following. It is situated in the Greater Magellanic Cloud.

V Wt. Remarks

+ 264'

V+264

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V+271

N.G.C.2 2149. a = 5h 48m9; 8 = +46° 6'; A = 87° 55'; /3 = +22° 40' Hydrogen radiations are strong in this object.; H/3 and N2 have essentially equal intensities on the spectrograms. Hy is strong on the first plate, but its comparison line is poor.

v
—30i*

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Wt. Slit Remarks

. med. Lines fully exposed

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90°

med.

90°

med.

90°

med.

90°

long Excellent plate

255°

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The last exposure was made in search of rotation effects, with the slit upon the major axis of figure, but the spectrum lines seem not to be inclined.

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