Neglected Doubles Investigations
Some Neglected doubles I have investigated
HJ 2302 – Neglected (DSSC14)
HJ 2452 – Neglected (DSSC15)
HJ 258/GRV916/SPN1- Data error (DSSC15)
SHR1- Co-ordinate error (DSSC15)
HL 30AB/STU 2 – Duplication (DSSC15)
J252 – Neglected(DSSC17)
SEI 520 – Co-ordinate error
CHE 141/142 – duplicate & Co-ordinate error
HJ3027 – Co-ordinate error
BOT 3 – Transcription error.
HJ 2452 – Neglected (DSSC15)
HJ 258/GRV916/SPN1- Data error (DSSC15)
SHR1- Co-ordinate error (DSSC15)
HL 30AB/STU 2 – Duplication (DSSC15)
J252 – Neglected(DSSC17)
SEI 520 – Co-ordinate error
CHE 141/142 – duplicate & Co-ordinate error
HJ3027 – Co-ordinate error
BOT 3 – Transcription error.
SHR 1 Brief History
1st Measure 1910 and listed in Astronomische Nachrichten for 1913
Strasbourg Observatory, K Schiller
Only 2 nights measures of PA
Only 1 nights measures of separation
Considered ‘Lost’
SHR 1 Analysis
SHR 1 is a neglected pair in Cephus at 21h27.5m +70o28’ that has only been observed once. The WDS co-ordinates place the pair approximately 10 arc minutes south west of Beta Cephei. When sweeping this area with the 6mm Orthoscopic eyepiece (x200) I found and two possible pairs. They were to faint to measure visually so using the Aladin database I have confirm the existence of these pairs and their structure
Pair 1 is located 3 arc minutes to the west of Beta Cephei and about 7 arc minutes north east of the WDS co-ordinates. Whilst the co-ordinates are a poor fit to the WDS data, the structure of the pair is good fit. Pair 2 is located 6 arc minutes north east of star BD +69 1172 and is very close to the position given in the WDS but the PA and separation are not a good fit also this pair is also fainter so the magnitude data in the WDS fits Pair 1 better.
SHR1 Pair 1 Pair 2
Position 21h27.5m +70o28’ 21h28.8m +70o34’ 21h27.5m +70o28’
Magnitudes 10.2, 10.7 ~11 ~11.5
Separation 12.1 11.1 7.5
PA 151 143.2 279
Measures 1 1 1
Year 1910 1995 1995
SHR 1 analysis confirmation email
Hi Brian/Bob
I have been investigating this neglected pair and would like to share
what I have found. Bob has been helping me with this investigation and I have written a
piece for the DSSC15.
Whilst finding this pair I found 2 pairs that could be SHR 1.
One pair is a good fit with PA/Sep & magnitudes.
The other pair is at the correct co-ordinates (taking precession into
account). Both pairs show slight proper motion but not enough to explain the
difference in co-ordinates.
I am coming to the conclusion that Schiller measured the 1st pair but put the co-ordinates down for the
2nd pair.
I would like to know what you think.
---------------------------------------------------------------------------------------------------------------------------------------
That looks like the right conclusion to me.
Brian
---------------------------------------------------------------------------------------------------------------------------------------
Hi Ian,
I'm pretty sure that you are right when you say that Schiller observed Pair 1 and gave the position for Pair 2.
In that case the WDS needs to have the revised position for SHR 1 and then an entry for the other pair.
Cheers,
Bob
1st Measure 1910 and listed in Astronomische Nachrichten for 1913
Strasbourg Observatory, K Schiller
Only 2 nights measures of PA
Only 1 nights measures of separation
Considered ‘Lost’
SHR 1 Analysis
SHR 1 is a neglected pair in Cephus at 21h27.5m +70o28’ that has only been observed once. The WDS co-ordinates place the pair approximately 10 arc minutes south west of Beta Cephei. When sweeping this area with the 6mm Orthoscopic eyepiece (x200) I found and two possible pairs. They were to faint to measure visually so using the Aladin database I have confirm the existence of these pairs and their structure
Pair 1 is located 3 arc minutes to the west of Beta Cephei and about 7 arc minutes north east of the WDS co-ordinates. Whilst the co-ordinates are a poor fit to the WDS data, the structure of the pair is good fit. Pair 2 is located 6 arc minutes north east of star BD +69 1172 and is very close to the position given in the WDS but the PA and separation are not a good fit also this pair is also fainter so the magnitude data in the WDS fits Pair 1 better.
SHR1 Pair 1 Pair 2
Position 21h27.5m +70o28’ 21h28.8m +70o34’ 21h27.5m +70o28’
Magnitudes 10.2, 10.7 ~11 ~11.5
Separation 12.1 11.1 7.5
PA 151 143.2 279
Measures 1 1 1
Year 1910 1995 1995
SHR 1 analysis confirmation email
Hi Brian/Bob
I have been investigating this neglected pair and would like to share
what I have found. Bob has been helping me with this investigation and I have written a
piece for the DSSC15.
Whilst finding this pair I found 2 pairs that could be SHR 1.
One pair is a good fit with PA/Sep & magnitudes.
The other pair is at the correct co-ordinates (taking precession into
account). Both pairs show slight proper motion but not enough to explain the
difference in co-ordinates.
I am coming to the conclusion that Schiller measured the 1st pair but put the co-ordinates down for the
2nd pair.
I would like to know what you think.
---------------------------------------------------------------------------------------------------------------------------------------
That looks like the right conclusion to me.
Brian
---------------------------------------------------------------------------------------------------------------------------------------
Hi Ian,
I'm pretty sure that you are right when you say that Schiller observed Pair 1 and gave the position for Pair 2.
In that case the WDS needs to have the revised position for SHR 1 and then an entry for the other pair.
Cheers,
Bob