Tau Serpentis

The Bayer designation Tau Serpentis (τ Ser / τ Serpentis) is shared by a collection of eight stars, τ1 Serpentis through τ8 Serpentis, in the head of the constellation Serpens. They are distributed within a box of size 40 minutes in right ascension by 3.5° in declination. They are numbered by increasing right ascension:
 * Tau1 Serpentis, also designated 9 Serpentis or HD 137471.
 * Tau2 Serpentis, also designated 12 Serpentis or HD 138527.
 * Tau3 Serpentis, also designated 15 Serpentis or HD 139074.
 * Tau4 Serpentis, also designated 17 Serpentis or HD 139216.
 * Tau5 Serpentis, also designated 18 Serpentis or HD 139225.
 * Tau6 Serpentis, also designated 19 Serpentis or HD 140027.
 * Tau7 Serpentis, also designated 22 Serpentis or HD 140232.
 * Tau8 Serpentis, also designated 26 Serpentis or HD 140729.