[AZ-Observing] McNeil Nebula BVRI field photometry

[Brian Skiff <Brian.Skiff@xxxxxxxxxx>]

Folks,
     Arne Henden at USNO-Flagstaff was nice enough to get a first stab at
a BVRI photometric sequence in the field of McNeil's Nebula and its
associated erupting star.  This was done with the Navy 1-m telescope + CCD
probably tonight (13 Feb UT), which is a stable photometric one but with
poor seeing.  Arne's source file is:

ftp://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/mcneil.dat

Arne has piles of similar stuff for other variables in the same directory.
     I have taken this and trimmed out a few faint stars with large errors
in the photometry and rearranged the column headers.  The uncertainties are
strictly from the fit to the standards from a single night, so have a likely
zero-point error of ~0.02 just from this.  The uncertainties are listed with
a minus sign to indicate they are single-night errors.  Note that the fainter
stars are pretty rough.  Arne's coordinates are in decimal degrees in both
RA and Dec, and were probably done against UCAC2 (or USNO-B1.0 if there
weren't enough stars).
     I have flagged the two brighter stars northeast of the nebula by name.
The previously estimated magnitude of the first wasn't too bad, but the
fainter star is quite a bit fainter than guessed (the visual magnitude will
be about mv=16.7).

\Brian



#  Name     RA  (J2000)  Dec     n   V      B-V    V-R    R-I   Vunc   BVunc  
VRunc  RIunc  remarks
MCNEIL    86.458215  -0.097210   1 14.193  1.362  0.867  0.785 -0.001 -0.002 
-0.001 -0.001
MCNEIL    86.532825  -0.199143   1 14.359  1.943  1.269  1.248 -0.002 -0.005 
-0.003 -0.002
MCNEIL    86.581120  -0.088877   1 14.853  1.577  1.081  1.081 -0.002 -0.004 
-0.003 -0.002  LkHA 301
MCNEIL    86.485580  -0.182250   1 14.971  1.137  0.713  0.609 -0.002 -0.004 
-0.003 -0.003
MCNEIL    86.593520  -0.147952   1 15.111  1.566  1.032  0.965 -0.002 -0.006 
-0.003 -0.002
MCNEIL    86.593310  -0.060632   1 15.663  1.259  0.794  0.658 -0.003 -0.008 
-0.004 -0.004
MCNEIL    86.578727  -0.093920   1 16.290  1.847  1.279  1.345 -0.005 -0.019 
-0.006 -0.004  GSC 4768-0696
MCNEIL    86.456525  -0.120680   1 16.292  1.624  1.015  1.004 -0.005 -0.016 
-0.006 -0.005
MCNEIL    86.501020  -0.140590   1 16.915  1.836  1.475  1.610 -0.008 -0.031 
-0.009 -0.004
MCNEIL    86.553945  -0.098670   1 17.172  1.028               -0.021 -0.036    
          
MCNEIL    86.487893  -0.034145   1 17.345  1.525  0.982  1.031 -0.011 -0.037 
-0.014 -0.009
MCNEIL    86.558340  -0.092250   1 17.674  0.788               -0.035 -0.050    
          
MCNEIL    86.537402  -0.037613   1 17.791  2.435  1.756  1.796 -0.025 -0.194 
-0.027 -0.009
MCNEIL    86.523967  -0.044360   1 17.973  2.184  1.554  1.573 -0.020 -0.154 
-0.022 -0.009
MCNEIL    86.494852  -0.026298   1 18.263  1.755  1.349  1.288 -0.025 -0.132 
-0.028 -0.015
MCNEIL    86.538687  -0.173867   1 18.500  0.671  1.393        -0.038 -0.060 
-0.043       
MCNEIL    86.532458  -0.163337   1 18.964  0.770  0.966  0.374 -0.046 -0.087 
-0.058 -0.059
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