Phyllon Kissinou

This star name has already been used by modern astronomers and is therefore suggested to be made official. Eric suggested this term, Susanne suggested to use the two terms "kissin" and "phyllon" for two of the three stars that have been associated with the term by Ptolemy.

Etymology & History

Ptolemy's original wording is φύλλοv κισσίνου (phyllon kissinoy), literally meaning "the ivy leaf".

It is the shape with which Ptolemy describes the area of Coma Berenices: In his list it is written "the rearmost of them [in the nebulous mass betwween the edges of Leo and Ursa Major, called Coma Berenices], shaped like an ivy leaf". This means he describes the shape of the Coma star cluster as an ivy leaf whose position he indicated with three stars among which 23 Com is the last in his register. Allen (1899) identifies "21 or 23 Com", Rhoads (1971) has "Kissin" for 21 Com but Ptolemy's coordinates fit 23 Com much better (cf. Toomer 1984, Grasshoff 1990 and all research based upon this).

Modern Usage of the Name

The name "Kissin" derived from "phyllon kissinoy" has been used for different stars:

• Rhoads (1971) has "Kissin" for 21 Com. Allen (1899):
• Hyde cited some ancient codices as applying to Fl. 21, toward the south, the title Kissīn, a species of Ivy, Convolvulus (bindweed), or perhaps the climbing Dog-rose. This appeared with Ulug Beg, evidently from Ptolemy's κίσσινος, but Ideler said that it was intended to mark c, g, and h, and Baily, that it was for Fl. 21 or 23.

Ptolemy's original text:

Ptolemy's "Ivy Leaf" as shape of the "nebulous mass" (star cluster) of Coma Berenices, in Stellarium

Star around Leo outside the constellation:

numbers	Ptolemy's text translated	identification
Example	The more avanced of the 2 over the back	(41 LMi)
Example	The rearmost of them	(54 Leo)
Example	The northernmost of the 3 under the flank	(χ Leo)
Example	The middle one of these	(59 Leo)
Example	The southernmost of them	(58 Leo)
Example	The northernmost part of the nebulous mass between the edges of Leo and Ursa [Major], called Coma [Berenices]	(15 Com)
Example	The most advanced of the southern outrunners of Coma	(7 Com)
Example	The rearmost of them, shaped like an ivy leaf	(23 Com)

His problem is that his catalogue only allows to give point coordinates but a "nebulous mass" is not described by a point. Hence, he states that there is an extended nebula with the shape of an ivy leaf and this shape should be drawn by the globe make in a way that it contains the three stars listed. Toomer (1984) identifies these stars as 15 (c), 7 (h) and 23 (k) Com. Although only the last one has the term "ivy leaf" in its description, this term refers to an area that encompasses all three (and possibly even more, fainter) stars.

IAU WGSN discussion

In 2023, the name Kissin has been proposed for inclusion in the IAU-Catalog of Star Names by Eric Mamajek due to its occurance in the contemporary literature. Independently, Susanne M Hoffmann, based on ongoing research on the ancient star catalog, has proposed to use Ptolemy's term "Phyllon kissinoy" (the ivy leaf) to name two stars in Coma. The WGSN has to discuss these suggestions.