astap program / Forum / General discussions ASTAP: list of measured magnitudes of an image

Joerg Spelda - 2023-08-24

Dear Han,

I noticed that it is possible to annotate images with "Magnitude (measured) annotaions" etc.
Is it possible to get a tabular output? At best with the following columns as (TAB delimited) text file : star name (at best Gaia name), alterative name (variable star annotation), coordinates (format of VSX), catalog magnitude, measured magnitude.
I guess this would mean an alterative output of "star info to clipboard"

If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

han.k - 2023-08-25

If the photometry is calibrated the output contains the magnitude measured. If the Gaia database is selected in the photometry tab you get also the Gaia magnitudes.

There are no real Gaia abbreviations. They have a number but it changes every edition. The position is the best reference.

What is missing?

........................................................................................................
Limiting magnitude is 20.2 (20.2< m <20.3, SNR=7, aperture ⌀max)
Passband filter used: CV
Passband database=magBP
Magnitudes are only valid if passband filter and passband database are compatible. E.g. CV=BP, G=V, R=R, B=B.
Option 1) Select in tab photometry a local database and in tab alignment the local database (standard=BP or V50=V)
Option 2) Select an online database in tab photometry.

Saturated stars are excluded to avoid photometric errors. For photometry purposes ignore stars with a low SNR value (SNR<30).

fitsX fitsY HFD α[°] δ[°] ADU SNR Magn_measured | Gaia-V Gaia-B Gaia-R Gaia-SG Gaia-SR Gaia-SI Gaia-G Gaia-BP Gaia-RP
474.24 246.04 4.785 143.183989 21.358851 1469 36 17.495 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
1267.02 267.83 9.469 143.169561 21.560459 26966 148 14.335 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
1608.12 281.22 4.707 143.162243 21.647160 1834 40 17.254 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
746.95 291.99 5.201 143.168516 21.427815 2006 39 17.157 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
1006.69 298.18 7.548 143.164044 21.493878 13937 110 15.052 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
904.13 303.31 6.320 143.163740 21.467715 6512 73 15.878 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
1261.54 309.30 5.698 143.158272 21.558644 2937 50 16.743 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
1312.87 324.73 7.870 143.153498 21.571557 16359 118 14.878 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
930.38 385.88 5.420 143.140876 21.473564 2191 44 17.061 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
960.15 390.02 7.487 143.139423 21.481102 14041 110 15.043 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
785.04 394.65 6.110 143.140039 21.436475 6731 75 15.842 | 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000

Last edit: han.k 2023-08-25

Untitled.png

If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

Joerg Spelda - 2023-08-29

Dear Han,

If you select tools -> "Star database annotation", you get the catalog magnitude and colour index printed on the image. I would be glad to have these two values also shown in the table.

With mag (measured)-mag(catalog), which you can calculate in Excel, you can get an impression of the deviation of both . Another fine tool would be to show this on the image: tools -> magnitude deviation

alpha and delta shoud be (additionally or instead) available in the format "hh mm ss.s +dd mm ss.s".
This means: only one space character between numbers and both coordinates in a single column.
At present also under ->" copy position to clipboard" and in the status line, bottom left, you give it in the shape "h: mm ss.ss +dd° mm ss.s (centroid)"
This means

hour only one digit, followed by a colon

two space charcters between minutes and second

a degree sign after the degree

the wording "(centroid)" at the end
This makes it necessary to make certain changes before using the string for a search in Simbad.
OK, online query -> "browser query (Simbad)" is another or easier way to get the star data.

If you select tools ->"variable star annotation" you get the AAVSO-names and variable stars printed. Why not including them in the table?

Also if you measure an unmarked star or/and give manual annotations it would be fine to include these data in the table.

I disagree that Gaia stars change their names. At least not between DR2 and EDR3. And the names are unique identifiers. If you have extracted/calculated the V-magnitudes from EDR3, the Gaia stars should be cited as "Gaia DR3 ...."
E.g. in Cartes du Ciel you can search for Gaia stars if you have installed the catalog.

All the best
Jörg

star_for_search_M33_1 Kopie.jpg

star_for_search_M33_2 Kopie.jpg

star_for_search_M33_3.jpg
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

han.k - 2023-08-31

For 1) and 2) use the popup option "Star info to clipboard. " If you select in the photometry tab the Gaia online database you get the large table below in the clipboard.

7: 53 05.64 + 2° 01 27.5 (Centroid)
Between Ra and Dec there is a tab so character #9. If you remove the (Centroid), Simbad will process it. Centroid indicates that a lock is on the star. So you get a very accurate position. I have no other way to indicate it was locked on the star.

If you select tools ->"variable star annotation" you get the AAVSO-names and variable stars printed. Why not including them in the table?

Because the stars can be annotated with the AAVSO online database info. That is more advanced then a table.

"Star info to clipboard. ":

Limiting magnitude is 14.3 (14.3< m <14.3, SNR=7, aperture ⌀1.5)
Passband filter used: TG
Passband database=V
Magnitudes are only valid if passband filter and passband database are compatible. E.g. CV=BP, G=V, R=R, B=B.
Option 1) Select in tab photometry a local database and in tab alignment the local database (standard=BP or V50=V)
Option 2) Select an online database in tab photometry.

Saturated stars are excluded to avoid photometric errors. For photometry purposes ignore stars with a low SNR value (SNR<30).

fitsX fitsY HFD α[°] δ[°] ADU SNR Magn_measured | Gaia-V Gaia-B Gaia-R Gaia-SG Gaia-SR Gaia-SI Gaia-G Gaia-BP Gaia-RP
865.97 366.41 4.515 118.437546 1.809954 56051 166 10.640 | 10.633 11.089 10.344 10.789 10.528 10.438 10.525 10.776 10.118
797.58 371.51 2.912 118.423934 1.728915 1569 11 14.523 | 10.633 11.089 10.344 10.789 10.528 10.438 10.525 10.776 10.118
916.89 373.72 4.374 118.434424 1.871513 13689 54 12.171 | 10.633 11.089 10.344 10.789 10.528 10.438 10.525 10.776 10.118
1069.88 373.75 4.232 118.451219 2.054062 28933 103 11.358 | 11.539 12.687 10.921 12.063 11.159 10.802 11.184 11.780 10.456
608.06 374.81 2.825 118.399159 1.503139 3012 19 13.815 | 11.539 12.687 10.921 12.063 11.159 10.802 11.184 11.780 10.456
897.60 377.13 3.902 118.428237 1.848880 9343 37 12.586 | 11.539 12.687 10.921 12.063 11.159 10.802 11.184 11.780 10.456
1

If you would like to refer to this comment somewhere else in this project, copy and paste the following link:

list of measured magnitudes of an image

Stacking program, astrometric (plate) solver, fits file viewer

Forums

Help

list of measured magnitudes of an image

list of measured magnitudes of an image

Stacking program, astrometric (plate) solver, fits file viewer

Forums

Help

list of measured magnitudes of an image document.SUBSCRIPTION_OPTIONS = { "thing": "topic", "subscribed": false, "url": "subscribe", "icon": { "css": "fa fa-envelope-o" } };

list of measured magnitudes of an image