BM ORIONIS

BM Orionis DATA

BM Orionis = HR1894 = HD37021
Name: ?

R.A. (2000) 05h 35m 16.11s
DEC. (2000) -05d 23' 06.9"

COMP	A	B
SPECT.	BOV	?
DIAM	5.0
MASS	5.4	?
LUM.	?	?
ABS.	?	?
MAG	?	?
TEMP.	?	?

I	?		V - I	?
R	?		R - I	?
V	7.96		B - V	+0.24
B	8.20		U - B	?
U	?

Distance: ? light years

Epoch: JD 2,440,265.343

Period: 6.470525 days

Secondary Eclipse at Phase: ?

Ingress/Egress: ~ 4.66 hrs
Totality: ~17 hours

Next Eclipse:

Secondary Eclipse - ?

Maximum Separation Date - ?

Recommended
Comparison Star:
theta 1 Orionis D, HR1893
R.A. (2000) 05h 35m17.20s
DEC. (2000)-05d 23m 15.7s
I = 6.22
R = 6.41
V = 6.70
B = 6.78
U = 5.96

BM Orionis (Ori)

BM Orionis is one of the stars of the Trapezium located in the great Orion Nebula. Single channel photometry is very difficult of the system due tot he closeness of the stars. CCD photometry on the other had is very easy.

BM Orionis is of interest because the star system produces an eclipse very similar to that of epsilon Aurigae, but much shorter (period of only 6.5 days versus 27 years for epsilon Aurigae). Like the eclipse of epsilon Aurigae the BM Orionis eclipse is flat-bottomed and even has a mid-eclipse brightening. Like the secondary of the epsilon Aurigae system the BM Orionis secondary appears to be a brick with a hole in it.