.../... A nice threefold in Andromeda. With no much comments, I prefer that JCS and Nachote remain my friends :lol: :lol: :lol: HLD 60 mag : 9.09 / 9.77 Medicion : Fecha : 24/09/2009 Theta : 168°8 Rho : 1"28 Residuals : B2009.733 o-c = -1°55/+0"04 Hei1963a (gr. 4) Residuals are constant si...

.../... HO 303 runs an edge-on orbit in 103 years. The computed orbit shows important residuals HO 303 AB mag : 8.50 / 10.81 Medicion : Fecha : 07/09/2009 Theta : 183°2 Rho : 1"20 Residuals : B2009.687 o-c = -3°2/+0"33 Hei1995 (gr. 5) As the previous, A 1242 is located in Pegasus. Despite ...

.../... BU 385 is a fairly close double which needs long focal to be imaged. The components are only four pixels apart with my setup. Making a good measurements at such separation needs to have good images. It was the case this night with a fast seeing which doesn't spread the core of the stars as s...

.../... As promised this is an illustration of the principle exposed upper in the topic. It was one of these nights I hate, high transparency but horrible seeing. The animation shows a subset of the first 30 frames from the total series of 250. hu987anim.gif The double is resolved only on two images...

.../... Do you want to taste some new seasonal fruits ? The following couple is located in Pegasus. There is no commonplace double stars, STF2934 has an astrometric companion. In the WDS file we find this enigmatic note : 'One component has an unseen companion with P = 82y. It is not known with whic...

Hola doblistas, Some parts of my message are in swahili :lol: :lol: :lol: Sorry Nachote, thank you for your efforts, I hope you didn't use too much aspirina "La longitud focal a foco primario y el tamaño de píxel son perfectamente conocidos. La escala a foco primario es fácil de calcular matemá...

Hola doblistas, Thank you all for your encouragements. Nachote, it will be difficult to answer in very few words about the calibration. I give some details, maybe some members could be interested and try it. For various reasons the calibration on large separation stars isn't as precise as I want for...

.../... Located in Cepheus, Krüger 60 is an exceptional system. It's a nearby double at only 13 light years of the Sun, it's also a pair of very low mass type M dwarfs (0.3 and 0.15 solar mass) and the B component is a flare star. While the separation is quite large, the difference of magnitude and...

Hola Rafa, Thank you for your kind words and for your translation, I'm profoundly in debt to you. I tried several translation engines from french to spanish but finally abandon this way when I saw the reverse translation from spanish to french ! If english is too annoying for the members, you can si...

.../... Maybe it could be useful to have a few words about the last line of my measurements. The residuals is the comparison between the observation and the calculus (ephemerides). The data of the next star shows : B2009.728 o-c = -1°7/+0"03 Hei1995 (gr. 4) B2009.728 is the mean Besselian epoch...