Acronym	starpedip (old: stipdip, starpendip)
Name	pentagram-pentagon duoprism, stellar (pentagonal) pentagonal diprism
Circumradius	1
Dihedral angles	at {5/2} between stip and stip:   108° at {4} between pip and stip:   90° at {5} between pip and pip:   36°
Face vector	25, 50, 35, 10
Confer	more general: n/d,m/b-dip   compounds: spidy   decompositions: pt || starpedip
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As abstract polytope starpedip is automorph, thereby interchanging the roles of pentagons and pentagrams, resp. those of pip and stip.

If considered with according densities, then starpedip can be thought of as the external blend of 5 pippies + 5 stippies. This decomposition is described as the degenerate segmentoteron ox5oo ox5/2oo&#x.

Incidence matrix according to Dynkin symbol

x5o x5/2o

. . .   . | 25 |  2  2 | 1  4 1 | 2 2
----------+----+-------+--------+----
x . .   . |  2 | 25  * | 1  2 0 | 2 1
. . x   . |  2 |  * 25 | 0  2 1 | 1 2
----------+----+-------+--------+----
x5o .   . |  5 |  5  0 | 5  * * | 2 0
x . x   . |  4 |  2  2 | * 25 * | 1 1
. . x5/2o |  5 |  0  5 | *  * 5 | 0 2
----------+----+-------+--------+----
x5o x   . ♦ 10 | 10  5 | 2  5 0 | 5 *
x . x5/2o ♦ 10 |  5 10 | 0  5 2 | * 5

x5o x5/3o

. . .   . | 25 |  2  2 | 1  4 1 | 2 2
----------+----+-------+--------+----
x . .   . |  2 | 25  * | 1  2 0 | 2 1
. . x   . |  2 |  * 25 | 0  2 1 | 1 2
----------+----+-------+--------+----
x5o .   . |  5 |  5  0 | 5  * * | 2 0
x . x   . |  4 |  2  2 | * 25 * | 1 1
. . x5/3o |  5 |  0  5 | *  * 5 | 0 2
----------+----+-------+--------+----
x5o x   . ♦ 10 | 10  5 | 2  5 0 | 5 *
x . x5/3o ♦ 10 |  5 10 | 0  5 2 | * 5

x5/2o x5/4o

.   . .   . | 25 |  2  2 | 1  4 1 | 2 2
------------+----+-------+--------+----
x   . .   . |  2 | 25  * | 1  2 0 | 2 1
.   . x   . |  2 |  * 25 | 0  2 1 | 1 2
------------+----+-------+--------+----
x5/2o .   . |  5 |  5  0 | 5  * * | 2 0
x   . x   . |  4 |  2  2 | * 25 * | 1 1
.   . x5/4o |  5 |  0  5 | *  * 5 | 0 2
------------+----+-------+--------+----
x5/2o x   . ♦ 10 | 10  5 | 2  5 0 | 5 *
x   . x5/4o ♦ 10 |  5 10 | 0  5 2 | * 5

x5/3o x5/4o

.   . .   . | 25 |  2  2 | 1  4 1 | 2 2
------------+----+-------+--------+----
x   . .   . |  2 | 25  * | 1  2 0 | 2 1
.   . x   . |  2 |  * 25 | 0  2 1 | 1 2
------------+----+-------+--------+----
x5/3o .   . |  5 |  5  0 | 5  * * | 2 0
x   . x   . |  4 |  2  2 | * 25 * | 1 1
.   . x5/4o |  5 |  0  5 | *  * 5 | 0 2
------------+----+-------+--------+----
x5/3o x   . ♦ 10 | 10  5 | 2  5 0 | 5 *
x   . x5/4o ♦ 10 |  5 10 | 0  5 2 | * 5