Color composite thumbnail image of Var 15Var 15 (J004419.43+412247.0 )


Target Notes

Color composite thumbnail image of Var_15

Classification: LBV

No blend concerns

Find In Simbad Query LGGS Massey (2016) at VizieR Query CAT WISE (Eisenhardt et al., 2020) at VizieR Query Gaia DR3 (2022) at VizieR LBT Spectra @UMN
Query Kaluzny et al. (1998) M31 Survey at VizieR
Query POINT-AGAPE An et al. (2004) M31 Survey at VizieR

Photometry Table

Download table (txt) Key to Flags in Table Key For Images Plot/Graph Variability
MJDV*ImageB*ImageR*ImagesI*Images
56142.33 17.98± 0.09TVar_15 in filter V on MJD 56142.330
------------
56267.14-------- 17.68± 0.06TVar_15 in filter R on MJD 56267.140
----
56490.38 18.28± 0.04TVar_15 in filter V on MJD 56490.380
------------
56536.26 18.24± 0.06-Var_15 in filter V on MJD 56536.260
---- 17.77± 0.06-Var_15 in filter R on MJD 56536.260
----
56537.20 18.26± 0.06-Var_15 in filter V on MJD 56537.200
 18.58± 0.08-Var_15 in filter B on MJD 56537.200
--------
56915.14 17.75± 0.04AVar_15 in filter V on MJD 56915.140
Var_15 in filter V on MJD 56915.140
 18.17± 0.06AVar_15 in filter B on MJD 56915.140
Var_15 in filter B on MJD 56915.140
 17.14± 0.04AVar_15 in filter R on MJD 56915.140
Var_15 in filter R on MJD 56915.140
----
57227.33 17.63± 0.04AVar_15 in filter V on MJD 57227.330
Var_15 in filter V on MJD 57227.330
 18.06± 0.05AVar_15 in filter B on MJD 57227.330
Var_15 in filter B on MJD 57227.330
 17.04± 0.04AVar_15 in filter R on MJD 57227.330
Var_15 in filter R on MJD 57227.330
----
57310.09 17.57± 0.04AVar_15 in filter V on MJD 57310.090
Var_15 in filter V on MJD 57310.090
-------- 16.57± 0.06AVar_15 in filter I on MJD 57310.090
Var_15 in filter I on MJD 57310.090
57633.30 17.74± 0.05AVar_15 in filter V on MJD 57633.300
Var_15 in filter V on MJD 57633.300
 18.18± 0.06AVar_15 in filter B on MJD 57633.300
Var_15 in filter B on MJD 57633.300
 17.15± 0.05AVar_15 in filter R on MJD 57633.300
Var_15 in filter R on MJD 57633.300
----
57635.35 17.72± 0.05-Var_15 in filter V on MJD 57635.350
-------- 16.77± 0.06-Var_15 in filter I on MJD 57635.350
57638.27 17.78± 0.05-Var_15 in filter V on MJD 57638.270
-------- 16.92± 0.05-Var_15 in filter I on MJD 57638.270
57928.34 17.81± 0.05AVar_15 in filter V on MJD 57928.340
Var_15 in filter V on MJD 57928.340
 18.22± 0.06AVar_15 in filter B on MJD 57928.340
Var_15 in filter B on MJD 57928.340
 17.27± 0.05AVar_15 in filter R on MJD 57928.340
Var_15 in filter R on MJD 57928.340
 16.91± 0.08AVar_15 in filter I on MJD 57928.340
Var_15 in filter I on MJD 57928.340
57958.26 17.87± 0.06-Var_15 in filter V on MJD 57958.260
 18.31± 0.09-Var_15 in filter B on MJD 57958.260
---- 16.88± 0.06-Var_15 in filter I on MJD 57958.260
57963.26 17.85± 0.06-Var_15 in filter V on MJD 57963.260
 18.25± 0.07-Var_15 in filter B on MJD 57963.260
--------
57988.22 17.77± 0.07-Var_15 in filter V on MJD 57988.220
 18.23± 0.08-Var_15 in filter B on MJD 57988.220
---- 16.77± 0.06-Var_15 in filter I on MJD 57988.220
58035.03 17.64± 0.04-Var_15 in filter V on MJD 58035.030
---- 17.05± 0.04-Var_15 in filter R on MJD 58035.030
----
58043.05 17.64± 0.05-Var_15 in filter V on MJD 58043.050
 18.12± 0.06-Var_15 in filter B on MJD 58043.050
 17.06± 0.04-Var_15 in filter R on MJD 58043.050
----
58045.05 17.62± 0.05-Var_15 in filter V on MJD 58045.050
-------- 16.68± 0.07-Var_15 in filter I on MJD 58045.050
58067.10 17.51± 0.05-Var_15 in filter V on MJD 58067.100
-------- 16.55± 0.06-Var_15 in filter I on MJD 58067.100
58073.09 17.53± 0.06-Var_15 in filter V on MJD 58073.090
 17.94± 0.08-Var_15 in filter B on MJD 58073.090
--------
58077.08 17.49± 0.08-Var_15 in filter V on MJD 58077.080
-------- 16.57± 0.07-Var_15 in filter I on MJD 58077.080
58098.07 17.48± 0.06-Var_15 in filter V on MJD 58098.070
 17.94± 0.08-Var_15 in filter B on MJD 58098.070
--------
58103.08 17.51± 0.05-Var_15 in filter V on MJD 58103.080
-------- 16.63± 0.07-Var_15 in filter I on MJD 58103.080
58312.26 17.40± 0.06-Var_15 in filter V on MJD 58312.260
 17.89± 0.07-Var_15 in filter B on MJD 58312.260
 16.81± 0.06-Var_15 in filter R on MJD 58312.260
----
58316.24 17.40± 0.06-Var_15 in filter V on MJD 58316.240
-------- 16.56± 0.06-Var_15 in filter I on MJD 58316.240
58339.26 17.30± 0.07-Var_15 in filter V on MJD 58339.260
-------- 16.40± 0.07-Var_15 in filter I on MJD 58339.260
58342.26 17.40± 0.04-Var_15 in filter V on MJD 58342.260
 17.85± 0.07-Var_15 in filter B on MJD 58342.260
--------
58366.11 17.30± 0.04-Var_15 in filter V on MJD 58366.110
 17.74± 0.07-Var_15 in filter B on MJD 58366.110
--------
58375.09 17.33± 0.05-Var_15 in filter V on MJD 58375.090
---- 16.75± 0.04-Var_15 in filter R on MJD 58375.090
----
58403.06 17.29± 0.04-Var_15 in filter V on MJD 58403.060
-------- 16.33± 0.05-Var_15 in filter I on MJD 58403.060
58420.01 17.24± 0.06-Var_15 in filter V on MJD 58420.010
 17.63± 0.08-Var_15 in filter B on MJD 58420.010
--------
58433.09 17.26± 0.06-Var_15 in filter V on MJD 58433.090
 17.74± 0.06-Var_15 in filter B on MJD 58433.090
 16.71± 0.06-Var_15 in filter R on MJD 58433.090
----
58436.04 17.26± 0.04-Var_15 in filter V on MJD 58436.040
 17.73± 0.06-Var_15 in filter B on MJD 58436.040
 16.71± 0.04-Var_15 in filter R on MJD 58436.040
----
58671.29 17.32± 0.07-Var_15 in filter V on MJD 58671.290
 17.87± 0.07-Var_15 in filter B on MJD 58671.290
--------
58673.29 17.38± 0.08-Var_15 in filter V on MJD 58673.290
---- 16.80± 0.07-Var_15 in filter R on MJD 58673.290
 16.43± 0.08-Var_15 in filter I on MJD 58673.290
58696.30 17.39± 0.07-Var_15 in filter V on MJD 58696.300
 17.80± 0.07-Var_15 in filter B on MJD 58696.300
 16.77± 0.08-Var_15 in filter R on MJD 58696.300
----
58750.07 17.32± 0.07-Var_15 in filter V on MJD 58750.070
 17.75± 0.06-Var_15 in filter B on MJD 58750.070
--------
58779.05 17.30± 0.06-Var_15 in filter V on MJD 58779.050
---- 16.78± 0.03-Var_15 in filter R on MJD 58779.050
----
58812.07 17.18± 0.08-Var_15 in filter V on MJD 58812.070
---- 16.67± 0.08-Var_15 in filter R on MJD 58812.070
----
59000.39 17.31± 0.07-Var_15 in filter V on MJD 59000.390
---- 16.74± 0.11-Var_15 in filter R on MJD 59000.390
----
59055.31 17.29± 0.07-Var_15 in filter V on MJD 59055.310
---- 16.75± 0.08-Var_15 in filter R on MJD 59055.310
----
59077.20 17.24± 0.07-Var_15 in filter V on MJD 59077.200
 17.77± 0.07-Var_15 in filter B on MJD 59077.200
 16.69± 0.07-Var_15 in filter R on MJD 59077.200
 16.34± 0.10-Var_15 in filter I on MJD 59077.200
59131.09 17.23± 0.07-Var_15 in filter V on MJD 59131.090
---- 16.68± 0.07-Var_15 in filter R on MJD 59131.090
----
59166.12 17.30± 0.07-Var_15 in filter V on MJD 59166.120
-------- 16.37± 0.09-Var_15 in filter I on MJD 59166.120
59194.11 17.25± 0.07-Var_15 in filter V on MJD 59194.110
 17.73± 0.07-Var_15 in filter B on MJD 59194.110
--------
59376.35 17.09± 0.07-Var_15 in filter V on MJD 59376.350
 17.62± 0.07-Var_15 in filter B on MJD 59376.350
--------
59409.37 17.11± 0.08-Var_15 in filter V on MJD 59409.370
---- 16.55± 0.07-Var_15 in filter R on MJD 59409.370
----
59441.26 17.14± 0.07-Var_15 in filter V on MJD 59441.260
 17.63± 0.08-Var_15 in filter B on MJD 59441.260
---- 16.24± 0.09-Var_15 in filter I on MJD 59441.260
59467.11 17.10± 0.07-Var_15 in filter V on MJD 59467.110
---- 16.54± 0.06-Var_15 in filter R on MJD 59467.110
----
59522.04 17.09± 0.07-Var_15 in filter V on MJD 59522.040
 17.58± 0.07-Var_15 in filter B on MJD 59522.040
---- 16.14± 0.11-Var_15 in filter I on MJD 59522.040
59546.05 17.05± 0.07-Var_15 in filter V on MJD 59546.050
---- 16.49± 0.07-Var_15 in filter R on MJD 59546.050
----
59583.10 16.99± 0.07-Var_15 in filter V on MJD 59583.100
 17.50± 0.07-Var_15 in filter B on MJD 59583.100
--------
59739.36 16.90± 0.07-Var_15 in filter V on MJD 59739.360
 17.40± 0.07-Var_15 in filter B on MJD 59739.360
 16.37± 0.07-Var_15 in filter R on MJD 59739.360
----
59816.14 16.89± 0.06-Var_15 in filter V on MJD 59816.140
-------- 16.00± 0.07-Var_15 in filter I on MJD 59816.140
59851.09 16.87± 0.07-Var_15 in filter V on MJD 59851.090
 17.35± 0.07-Var_15 in filter B on MJD 59851.090
 16.37± 0.07-Var_15 in filter R on MJD 59851.090
----
59879.03 16.91± 0.07-Var_15 in filter V on MJD 59879.030
-------- 15.98± 0.07-Var_15 in filter I on MJD 59879.030
59905.07 16.96± 0.07-Var_15 in filter V on MJD 59905.070
 17.43± 0.06-Var_15 in filter B on MJD 59905.070
 16.45± 0.07-Var_15 in filter R on MJD 59905.070
----
60147.26 16.98± 0.07AVar_15 in filter V on MJD 60147.260
Var_15 in filter V on MJD 60147.260
 17.43± 0.07-Var_15 in filter B on MJD 60147.260
 16.42± 0.07-Var_15 in filter R on MJD 60147.260
----
60172.19 17.02± 0.07AVar_15 in filter V on MJD 60172.190
Var_15 in filter V on MJD 60172.190
 17.48± 0.07-Var_15 in filter B on MJD 60172.190
 16.46± 0.06-Var_15 in filter R on MJD 60172.190
 16.09± 0.09AVar_15 in filter I on MJD 60172.190
Var_15 in filter I on MJD 60172.190
60201.09 16.95± 0.07-Var_15 in filter V on MJD 60201.090
---- 16.43± 0.07-Var_15 in filter R on MJD 60201.090
----
60202.10 16.92± 0.06-Var_15 in filter V on MJD 60202.100
 17.41± 0.07-Var_15 in filter B on MJD 60202.100
--------
60251.02 16.96± 0.07AVar_15 in filter V on MJD 60251.020
Var_15 in filter V on MJD 60251.020
 17.44± 0.07-Var_15 in filter B on MJD 60251.020
---- 16.03± 0.07-Var_15 in filter I on MJD 60251.020
60290.09 16.91± 0.07-Var_15 in filter V on MJD 60290.090
---- 16.40± 0.07-Var_15 in filter R on MJD 60290.090
 15.92± 0.09-Var_15 in filter I on MJD 60290.090
60469.36 16.79± 0.07AVar_15 in filter V on MJD 60469.360
Var_15 in filter V on MJD 60469.360
 17.26± 0.07-Var_15 in filter B on MJD 60469.360
 16.27± 0.08-Var_15 in filter R on MJD 60469.360
----
60504.32 16.73± 0.07AVar_15 in filter V on MJD 60504.320
Var_15 in filter V on MJD 60504.320
 17.23± 0.08-Var_15 in filter B on MJD 60504.320
 16.25± 0.06-Var_15 in filter R on MJD 60504.320
----
60529.23 16.79± 0.07-Var_15 in filter V on MJD 60529.230
-------- 15.88± 0.06-Var_15 in filter I on MJD 60529.230
60533.25 16.76± 0.07TVar_15 in filter V on MJD 60533.250
------------
60555.14 16.80± 0.06AVar_15 in filter V on MJD 60555.140
Var_15 in filter V on MJD 60555.140
 17.27± 0.06-Var_15 in filter B on MJD 60555.140
 16.30± 0.06AVar_15 in filter R on MJD 60555.140
Var_15 in filter R on MJD 60555.140
 15.87± 0.09-Var_15 in filter I on MJD 60555.140
60587.10 16.84± 0.06-Var_15 in filter V on MJD 60587.100
-------- 15.93± 0.07-Var_15 in filter I on MJD 60587.100
60594.07 16.84± 0.07-Var_15 in filter V on MJD 60594.070
 17.30± 0.07-Var_15 in filter B on MJD 60594.070
 16.29± 0.07-Var_15 in filter R on MJD 60594.070
----
60649.08 16.84± 0.07-Var_15 in filter V on MJD 60649.080
 17.28± 0.07-Var_15 in filter B on MJD 60649.080
 16.33± 0.07-Var_15 in filter R on MJD 60649.080
----
60651.11 16.80± 0.06-Var_15 in filter V on MJD 60651.110
-------- 15.84± 0.09-Var_15 in filter I on MJD 60651.110
Download table (txt) Key to Flags in Table Key For Images Plot/Graph Variability

Plots of Brightness and Color

Key for Plot Variability Photometry Table Target Notes

Plot of photometry for Var_15Plot of color for Var_15

Key for Plot Variability Photometry Table Target Notes

Variability

Plot/Graph Photometry Table Target Notes

It is very likely that this star is variable.

Correlation factors between bands

If the brightness variation is true variability then there should be a correlation between brightness changes recorded in different filter bands. The following table are the R-squared linear correlation factors calculated for the pairs of bands. The number in parentheses next to the R-squared value is the number of elements used to calculate the correlation factor. The number in square brackets next to the band is the range of magnitudes measured.

V [1.55 mag]B [1.35 mag]R [1.52 mag]
B [1.35 mag]0.99 (38)
R [1.52 mag]0.99 (34)0.99 (20)
I [1.09 mag]0.99 (27)0.99 (9)0.99 (6)

Magnitude-Magnitude Plots

The plots below are provided to check the values in the table above and also to show any non-linear correlations

Plot to assess correlation between bands for Var_15

Plot to assess correlation between bands for Var_15

Plot/Graph Photometry Table Target Notes

I & R Statistics

Welch & Stetson (1993, AJ, 105, 1813) present a method for varible star detection in CCD images from automated surveys. Data from two bands are compared and two statistics are calculated: R and I.

The I-statistic has an expectation value of zero for stars that are NOT variable. A larger non-zero I-value indicates a higher likelihood that the star is variable. The R statistic indicates how the color of the star changes as the variable grows brighter with R = 1.0 being no change in color.

R and I values have only been calculated if there are more than four (4) matched measurements of brightness in each band.
V
(I|R)		B
(I|R)		R
(I|R)
B
(I|R)		29.79 | 0.80
R
(I|R)		35.31 | 1.0623.60 | 0.27
I
(I|R)		29.57 | 1.1726.35 | 0.9627.75 | 1.28

Back to catalog index

By John C. Martin, University of Illinois Springfield Henry R. Barber Research Observatory

Generated on 2025-08-04 15:53:14 UT-5