Registry · deep sky

RX J123551+27561

ULX SIMBAD ULX 81 papers

harvesting The full record is being pulled from the archives right now — measurement tables, the Gaia row, catalogue photometry. This page will fill itself in.

Right ascension: 12h 35m 51.71s
Declination: +27° 56′ 04.1″
Galactic l, b: 198.89, 86.45

Also known as

18 identifiers

1RXS J123551.6+2755552XMM J123551.7+275604CXOU J123551.7+275604IC 3550IXO 65NGC 4559CRX J123551+27561RX J1235.8+2755[BWC2008] U25[FK2005] 17[LB2005] NGC 4559 ULX2[LB2005] NGC 4559 X5[LM2005] NGC 4559 ULX1[RW2000] NGC 4559 X-1[SGT2004] J123551.71+275604.1[SST2011] J123551.71+275604.1[STS2009b] J123551.71+275604.1[VPB97] 7

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
SDSS J123551.86+275557.0	Galaxy	7.381″	—
AT 2016blu	Variable*	10.63″	—
PSN J12355230+2755559	Supernova Candidate	11.47″	—
NGC 4559	HIIG	120.8″	10.01
SN 1941A	Supernova	123.8″	13.2
RX J123558+27577	ULX Candidate	133.4″	—
[SST2011] J123557.79+275807.4	ULX Candidate	147.1″	—
NGP 28 99	Star	194.3″	11.89
2MASS J12355232+2750413	Star	322.9″	—
SDSS J123613.50+275150.3	QSO	384.5″	21.24
ATO J188.8601+27.8665	RSCVnV*	414.6″	—

Provenance

where this card came from

Archive	Read at (UTC)	Record
Seeded from the bulk archive load; no per-object fetch yet.

Machine-readable: /api/v1/object/rx-j123551-27561 · Registry entry updated 2026-08-14.