HD 98800

Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 150 light-years (45 parsecs) away.

Its membership was derived from the fact that its proper motion is similar to other stars in the group.

[10] The primary component, HD 98800 A, is a K-type main-sequence star[3] with a varying radial velocity.

[15] The brightness of HD 98800 varies slightly between magnitudes 8.91 and 8.98, and it has been given the variable star designation TV Crateris.

[4] The designation TV Crateris includes all four stars and it appears that both components A and B are variable.

Component A varies with a period of 2.521 days which is thought to be its rotation period and it is classified as an RS Canum Venaticorum variable, a dwarf star with an uneven surface brightness that changes brightness as it rotates.

The outer ring begins at approximately 5.9 astronomical units from the central binary, and extends out an undetermined distance.

A visual band light curve for TV Crateris, adapted from Henry et al. (1995) [ 16 ]
An image of the debris disk around HD 98800 B by ALMA . The disk is misaligned with the orbital plane of the inner binary.