They're two double stars
in Draco's head, and they provide two completely different viewing experiences.
Nine bright southern double stars
were measured and compared with observations made by Bob Argyle (from Cambridge University) using the 26" refractor in Johannesburg and the values listed in the Washington Double Star
The other clusters and double stars
marked on the map are described in the table above.
The International Occultation Timing Association (IOTA) undertakes a worldwide programme of video-recording lunar occultations of known and suspected double stars
, to ascertain their duplicity, position angle, separation and difference in magnitude.
They pave the way for many further fascinating studies of interacting double stars
," said co-author Jean-Philippe Berger.
Although there have been past hints of the existence of other planets around double stars
, this is the first confirmation.
Visual double stars
are among the easiest of all astronomical objects to observe.
144 double stars
are listed and mapped in order to provide useful tagets for those nights when deep-sky observation is less than optimum.
In 1651 Riccioli (see 1650, Double Stars
) published Almagestum Novum (New Almagest).
Other notable attributes of Capricornus include its compactness, its rich connections with language, its remarkable double stars
, and its position with regard to the zodiac, the Summer Triangle, and certain deep-sky objects.
In an effort to generate grass roots interest in double stars
, the writer has produced a "Double star
of the month " column in Canopus, the newsletter of the Johannesburg Centre and positive input has been received from several observers, with Jerome Jooste making a major contribution by imaging most of the double stars
are not greatly affected by the bright summer skies, and it is a good time to search out some of the classic doubles.