Registry · deep sky

X Sgr X-4

LowMassXBin SIMBAD LXB 1,066 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: 18h 23m 40.57s
Declination: −30° 21′ 40.6″
Galactic l, b: 2.7882, -7.914
Magnitude V: 18.81

Also known as

29 identifiers

1ES 1820-30.31H 1820-3031M 1820-3031RXS J182340.5-3021372S 1820-3032U 1820-303A 1820-3033U 1820-304U 1820-304U 1820-303[BM83] X1820-303Cl* NGC 6624 DMA ACl* NGC 6624 SK 1210H 1817-30H 1820-303INTREF 902MXB 1820-30PBC J1823.6-3021SRGA J182340.5-302138SWIFT J1823.6-3021SWIFT J1823.7-3023X Sgr X-4XB 1820-30XB 1820-303INTEGRAL1 89[KGB96] NGC 6624 1[KRL2007b] 316[RTB2002] J182340.46-302140.3[ZGV2011] 12

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
NGC 6624	GlobCluster	1.189″	—
PSR J1820-30A	Pulsar	1.302″	—
PSR J1823-3021G	Pulsar	5.342″	—
PSR J1823-3021C	Pulsar	7.829″	—
PSR B1820-30B	Pulsar	12.58″	—
Cl* NGC 6624 SZR DN	CataclyV*	18.85″	—
PSR J1823-3022	Pulsar	180.5″	—
HD 169019	HighPM*	250.8″	9.5
IRAS 18204-3027	Mira	260.9″	—
OGLE BLG-RRLYR-59470	RRLyrae	302.8″	18.74
OGLE BLG-RRLYR-59648	RRLyrae	331.8″	15.85

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/x-sgr-x-4 · Registry entry updated 2026-08-14.