Registry · deep sky

NGC 3998

Seyfert2 SIMBAD Sy2 689 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: 11h 57m 56.13s
Declination: +55° 27′ 12.9″
Galactic l, b: 138.17, 60.06
Magnitude V: 12.1
Parallax: 0.0799 mas
Redshift z: 0.0035742
Radial velocity: 1,069.6 km/s
Proper motion: 0.049, 0.136 mas/yr
Angular size: 3.105′ × 2.471′

Also known as

65 identifiers

1AXG J115757+55271ES 1155+55.71RXS J115756.1+5527172E 1155.3+55432E 25612MASS J11575612+55271282MASX J11575616+55271282XMM J115756.1+5527146C 115520+5543407C 115520.50+554349.0087GB 115521.8+554353BWE 1155+5543CGRaBS J1157+5527EQ 1155+557FIRST J115756.1+552713Gaia DR2 841020502831092352Gaia DR3 841020502831092352GB6 B1155+5543ILT J115755.83+552710.8INTREF 470IRAS 11553+5543IRAS F11553+5543IVS B1155+557LEDA 37642[M98c] 115521.4+554357NGC 3998NVSS J115756+552712PBC J1158.1+5527QSO B1155+557[R97] NGC 3998 9RBS 1053RGB J1157+554RX J1157.9+5527SDSS J115756.13+552713.0SRGA J115755.3+552721SWIFT J1157.8+5529SWIFT J1158.0+5526SWIFT J1158.1+5526[T76] 47BTIC 55684273UGC 6946UZC J115756.2+552713WB 1155+5543WISE J115756.15+552713.0WN B1155.3+5543XSS J11570+5514Z 1155.3+5543Z 269-25[BAG2012] 179.5145+55.4250[CAB95] IRAS F11553+5543[CHM2007] HDC 706 J115756.16+5527128[CHM2007] LDC 867 J115756.16+5527128[HSN2016] J179.48+55.45[LB2005] NGC 3998 X1MCG+09-20-046[RW2000] NGC 3998 X-2[SMM2006b] J115756.13+552713.0[SRM2005] J115756.13+552712.9[VV2000c] J115756.1+552713[VV2003c] J115756.1+552713[VV2006c] J115756.1+552713[VV2010c] J115756.1+552713[VV98c] J115756.1+552713[WTW94] 1155+557[ZEH2003] RX J1157.9+5527 1

In the same field

within 9 arcmin · wider search

Object	Type	Separation	V
2MASS J11574651+5526065	EmissionG	105″	—
NGC 3990	GinPair	175.8″	—
LEDA 213915	AGN Candidate	279.7″	—
TYC 3836-143-1	HighPM*	280.5″	10.81
SDSS J115807.95+553224.2	QSO	327.1″	—
HD 238058	HorBranch*	335.5″	9.66
2XMMi J115811.9+552126	ClG	353.7″	—
LEDA 2502525	Galaxy	361.2″	—
2MASS J11580208+5519315	HorBranch*	464.2″	—
TYC 3836-235-1	RGB*	472.2″	11.21
LEDA 2501414	GtowardsCl	477.6″	—

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/ngc-3998 · Registry entry updated 2026-08-14.