Search Publications

The Nearest Stars (Presidential Address)

Glass, I. S.

A history of star position measurements, leading to proper motions and parallax measurements is given, with special reference to the southern hemisphere, Alpha Cen and Proxima Cen. The Hipparcos and Gaia satellites are also mentioned.

NT Aps, a southern sky W UMa stellar system with a decreasing period.

Middleton, C. T.

NT Aps, a W UMa star in the southern hemisphere, was observed in white light in 2007 and Band V filter in 2008 using personal telescopes from South Africa. From the Hipparcos ephemeris of 1991 a decrease in period of ~125 seconds per year for the binary is detected. Furthermore, software modeling packages of BINARY MAKER 3 and PHOEBE were employed…

The Discovery of the Nearest Star

Glass, I. S.

In the 1830s, the double star α Centauri was the subject of the first successful stellar parallax measurement. For almost eighty years it remained the nearest star known. However, in 1915 at the Union Observatory in Johannesburg, R.T.A. Innes found a faint object near α Cen with a similar proper motion. Its parallax was measured over the following…

Rosetta flyby observed from Cape Town

Roberts, Gregory

Uses of the V Magnitudes Reobserved with the Hipparcos & Tycho Photometers Outside the Earth's Atmosphere

Cousins, A. W. J.

The Hipparcos distance scale for Cepheids and Miras and its consequences.

Feast, M. W.