did doubles checks

Did some follow up on the double stars from last night.



ARY 8

From the Washington Double Star database, I found two lines, suggesting a triple. Curiously, the first reported discoveries for both were in 1910. Both updated in 2015. I show the latest values.

00108+5846ARY   8
AB    100  39.1  8.13  8.63 B3IV
AC    43 104.3  8.13  8.29 B7V

The plotted position in SkyTools 3 Pro of B to A is 100° and 39". Good.

The plotted position to the other similar star to A was 43° and 104". Well look at that. So I did see the C comrade! OK.

The magnitudes inside ST3P matched too. Equal stars. Same stellar classes too.

I don't understand why the software didn't show it as a triple.



Struve 196

From the WDS. I was after the magnitude values this time.

01596+2100STF 196
AB    2015   41   1.8  9.36 10.92 G5
AC    2013   146  21.1  9.36 10.18 G5
AD    2015   9  199.7  9.36  6.01 K0III-IV
BC    2016   154  20.9 10.92 10.18
CD    2015   5  217.3 10.18  6.01

So, a quad system with magnitudes:

A 9.4
B 10.9
C 10.2
D 6.0

Interesting. A multi-star system where A is not the brightest. Not the first time I've encountered something like this. But intriguing that the brightest accomplice is the fourth star.



Sharatan

Huh. A fairly recent discovery with the first entry in 1988.

01546+2049MKT   3   
1988 93 0.1 
2005   113   0.0
2.6   5.2  A5V

But the separation values? 0.1 noted 30 years ago down to 0.0 a dozen years ago?! Wow. Nothing like was SkyTools shows. The PA is not bad but it is definitely not 69 arcseconds away.

I also check Stelladoppie for MKT 3. Confirmed it is a very tight pair, spectroscopic really. The rho or separation is never shown more than 0.065".

It is fast! 107 days... But too bad I will never see it.