Johann Louis Emil Dreyer

Obituary: MNRAS 87, 251 (1927); Obs. 49, 293 (1926); PASP 38, 400 (1926); Pop. Astr. 35, 325 (1927)

Dreyer discovered 18 NGC-objects with Lord Rosse's 72" reflector at Birr Castle. They are published in Lawrence Parsons (4th Earl of Rosse) collection of all Birr observations; see: Observations of Nebulae and Clusters of Stars Made With the Six-foot and Three-foot Reflectors at Birr Castle From the Year 1848 up to the Year 1878, Scientific Transactions of the Royal Dublin Society Vol. II, 1878. The identifications in column "Other" refer to this work (G.C. are from Dreyer's supplement). 13 objects are non-stellar. Dreyer found most of the galaxies in the NGC 4005-group at the border of Leo and Come Berenices. NGC 3069 is identical to IC 580 (Javelle, Mar. 22, 1892). One object found by Dreyer, the galaxy NGC 3698 in UMA (G.C. 5565, found Mar. 18, 1876), is identical to NGC 3695 (G.C. 5564) discovered by Ball in 1867 with the same instrument.

NGC
Other
Con
Date
Type
372
G.C. 5146
PSC
Dec. 12, 1876
4 stars
373
G.C. 5147
PSC
Dec. 12, 1876
galaxy
709
G.C. 5195
AND
Nov. 18, 1877
galaxy
1195
G.C. 5297
ERI
Jan. 8, 1877
galaxy
1276
G.C. 5303
PER
Dec. 12, 1876
2 stars
1279
G.C. 5306
PER
Dec. 12, 1876
galaxy
1281
G.C. 5307
PER
Dec. 12, 1876
galaxy
1446
 
ERI
Jan. 8, 1877
star
2806
G.C. 5469
CNC
Mar. 22, 1876
star
3069
G.C. 5513
LEO
Mar. 15, 1876
galaxy
4009
i
LEO
Apr. 26, 1878
star
4011
e
LEO
Apr. 26, 1878
galaxy
4015
b
COM
Apr. 26, 1878
galaxy
4018
k
COM
Apr. 26, 1878
galaxy
4021
d
COM
Apr. 26, 1878
galaxy
4022
l
COM
Apr. 26, 1878
galaxy
4023
g
COM
Apr. 26, 1878
galaxy
5226
 
VIR
Apr. 5, 1877
galaxy

 

Birr Castle

 

72" Reflector

 

Dreyer at Armagh Observatory

10" Refractor