## Explanation of fisheye outputs

RA is right ascension (in J2000)

DEC is declination (J2000 system, we need to talk about that aspect)

HA is hour angle

xcalc is computed expectation of x coord for that cataloged object

ycalc is computed expectation of y coord for that cataloged object

BT is Hipparcos catalog photometry in their BT band

VT is Hipparcos catalog photometry in their VT band

V is computed expectation of V band magnitude

(B-V) is computed expectation of V-R color, in conventional bands

(V-I) is computed expectation of V-I color, in conventional bands

m is Tonry's computed expectation of Canon camera monochromatic magnitude, includes a color term

x is x coord of object centroid in image

y is y coord of object centroid in image

HAcalc is computed expected HA using actual x,y

Deccalc is computed expected DEC using actual x,y

alt is altitude above the horizon, presumably computed from actual x,y

rad is radius, in pixels, from center of the image

minst is instrumental magnitude, i.e. -2.5*log_10(integrated ADU within the aperture used by tphot, after sky subtraction and vignetting correction)

dm is flux uncertainty, expressed in magnitudes

sky is computed background level around the source in question

dvig is the vignetting correction that was applied in obtaining minst, in magnitudes, so we can back out the actual flux value if desired.

## Mch file columns

MJD RA Dec HA xcalc ycalc BT VT V (B-V) (V-I) m x y HAcalc Decalc alt rad minst dm sky dvig