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database stuffing finished, UBVRI vs. Dayton mags, etc.
- To: tass@wwa.com
- Subject: database stuffing finished, UBVRI vs. Dayton mags, etc.
- From: Stupendous Man <richmond@a188-l009.rit.edu>
- Date: Thu, 4 Jun 1998 14:01:29 -0400
- Old-Return-Path: <richmond@a188-l009.rit.edu>
- Resent-Date: Thu, 4 Jun 1998 14:01:49 -0400
- Resent-From: tass@wwa.com
- Resent-Message-ID: <"WBgrRD.A._pF.CMud1"@kani.wwa.com>
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This brief note mentions several items.
1. The database is stuffed -- but it may not be very useful yet.
I'm currently running a procedure which will calculate the
mean magnitude in V and I for all stars observed at least
10 times. That table will be the one to query most often,
I think.
2. I tested the "chart-generation" software, and it does a fair
job. It does require the table with mean V and I magnitudes,
so it won't be ready for use until Saturday or Sunday.
3. After I made a sample chart, I noticed that there are still
some entries in the "tass_cat" table which belong to the
same actual star -- that is, the table contains 2 entries,
with nearly the same position and catalog. I'll have to
come up with some way of merging these entries later.
Using a catalog "seed" will avoid this problem, I think.
4. I made a plot of (RA, Dec) for 1 of every 50 stars in the catalog.
Look at the "Pretty Pictures" section of the TASS home page.
http://a188-l009.rit.edu/tass/pretty.html
I get the feeling I've omitted some of the TASS datafiles
which people have sent to me. There's a huge gap between
RA = 196 degrees and RA = 254 degrees -- a section of the
sky which passes over the meridian in October and November.
When I look at TN 41, I see that Glenn's data, alone, has a
number of observations in this area. I must have failed to
import some of his data. Rats.
5. Glenn asked about the offset I find between magnitudes of
stars in the Dayton compilation and magnitudes in Arne
Henden's "UBVRI" catalog. I may be using a larger version
of the UBVRI catalog than Glenn. I append below the
comparison, for all 18 stars in common.
6. Arne warns us not to claim to have discovered variable stars
prematurely. I agree. I was going to start with candidates
from the Dayton data and see if there were other observations
from other sites which I could add to the candidate light
curves ... but now it looks like I may have to import some
more data instead. Sigh.
I'll produce a list of candidates, with (RA, Dec) positions
and some sample data in tabular form, by the end of today.
That's all for now.
Michael Richmond
-------------------- comparison Dayton vs. UBVRI follows -----------------
Pairs of objects within 15 arcsec of each other from
A. Arne Henden's "UBVRI" catalog (version with 730 stars)
B. Glenn Gombert's "photom3.out" catalog (92512 stars)
18 pairs: difference in V-band: mean = 0.24 mag, stdev = 0.64
I-band: mean = 0.52 mag, stdev = 0.95
Of the 18 pairs, 7 have absolute value of (deltaV) <= 0.10 mag
5 have absolute value of (deltaI) <= 0.10 mag
The "pos" lines below contain information on
- difference in RA (arcsec)
- difference in Dec (arcsec)
- overall difference in position (arcsec)
- difference in V-band magnitude
- difference in I-band magnitude
star name RA Dec V I
----------------------------------------------------------------------
cat star NSV1754: 73.3296 -3.4512 10.35 12.41
TASS star 21125: 73.3299 -3.4509 10.40 9.46
pos: -1.1 -1.0 1.5 dV: -0.05 dI: 2.95
cat star NSV1754: 73.3409 -3.3818 11.35 11.02
TASS star 21127: 73.3413 -3.3825 11.57 11.23
pos: -1.5 2.7 3.1 dV: -0.22 dI: -0.21
cat star NSV1754: 73.4225 -3.4351 11.56 10.99
TASS star 21151: 73.4222 -3.4372 12.05 11.06
pos: 1.1 7.7 7.7 dV: -0.49 dI: -0.07
cat star RU152: 112.4079 -2.1646 11.48 10.94
TASS star 25342: 112.4084 -2.1644 11.47 10.99
pos: -1.8 -0.8 2.0 dV: 0.01 dI: -0.05
cat star RU152: 112.4182 -2.0704 12.46 11.37
TASS star 25343: 112.4192 -2.0668 12.44 11.50
pos: -3.6 -12.8 13.3 dV: 0.02 dI: -0.13
cat star RU152: 112.4666 -2.1181 11.60 10.98
TASS star 25347: 112.4676 -2.1183 11.56 10.91
pos: -3.4 0.7 3.5 dV: 0.04 dI: 0.07
cat star RU152: 112.5038 -2.1636 10.88 10.71
TASS star 25351: 112.5037 -2.1646 11.75 10.60
pos: 0.5 3.7 3.7 dV: -0.86 dI: 0.11
cat star RU152: 112.5093 -2.1360 14.87 14.18
TASS star 25352: 112.5093 -2.1341 12.76 11.21
pos: 0.0 -6.9 6.9 dV: 2.11 dI: 2.97
cat star RU152: 112.5118 -2.1335 13.12 11.71
TASS star 25352: 112.5093 -2.1341 12.76 11.21
pos: 9.0 2.1 9.3 dV: 0.37 dI: 0.50
cat star RU152: 112.5251 -2.0773 11.07 10.16
TASS star 25353: 112.5256 -2.0766 11.15 10.22
pos: -1.9 -2.7 3.3 dV: -0.07 dI: -0.06
cat star RU152: 112.5435 -2.0194 13.16 12.07
TASS star 25355: 112.5410 -2.0207 12.73 11.24
pos: 9.0 4.6 10.1 dV: 0.44 dI: 0.83
cat star V910_AQL: 305.7236 -1.6516 11.87 11.06
TASS star 62089: 305.7243 -1.6519 11.76 11.01
pos: -2.5 1.0 2.7 dV: 0.11 dI: 0.05
cat star V910_AQL: 305.7553 -1.6298 13.33 12.65
TASS star 62107: 305.7564 -1.6308 12.61 12.04
pos: -4.0 3.5 5.3 dV: 0.72 dI: 0.61
cat star V910_AQL: 305.7565 -1.6333 13.27 12.45
TASS star 62107: 305.7564 -1.6308 12.61 12.04
pos: 0.3 -9.2 9.2 dV: 0.66 dI: 0.41
cat star V910_AQL: 305.7816 -1.6307 13.22 12.28
TASS star 62134: 305.7831 -1.6300 12.75 11.98
pos: -5.3 -2.7 5.9 dV: 0.47 dI: 0.30
cat star V910_AQL: 305.7851 -1.6276 13.82 13.01
TASS star 62134: 305.7831 -1.6300 12.75 11.98
pos: 7.2 8.7 11.3 dV: 1.07 dI: 1.02
cat star V910_AQL: 305.8545 -1.6022 13.02 11.65
TASS star 62191: 305.8533 -1.6021 12.99 11.39
pos: 4.4 -0.4 4.4 dV: 0.03 dI: 0.26
cat star V910_AQL: 305.8809 -1.6551 12.31 11.80
TASS star 62216: 305.8806 -1.6549 12.30 12.07
pos: 1.2 -0.6 1.3 dV: 0.01 dI: -0.27