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Ω_matter

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Results for object NGC 7421 (ngc7421)

Overview
Cross-IDs (26)
Coordinates (7)
Redshifts (8)
Distances (4)
Classifications (30)
Notes (7)
Diameters (18)
Photometry & SED (37)
Spectra (2)
Images (14)
References (100)
External Links

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POSS-II F (North), AAO-SES/SERC-ER (South), Red image
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Image Credit: Caltech or AAO/ROE

Selected data and derived quantities for NGC 7421†. More information in the tabs above.
Cross-identifications				Essential note
NGC 7421; ESO 346- G 017; ESO 225406-3736.9; AM 2254-373; MCG -06-50-015
Coordinates for Preferred Position
Equatorial (J2000)					Galactic
RA, Dec	RA, Dec [Deg]	Unc Semi-major,minor ["]	Unc PA [deg]	Reference	Lon, Lat [deg]
22h56m54.33s, -37d20m50.1s	344.226375, -37.347250	1.25E+00, 1.25E+00	0	20032MASX.C.......:	2.729182, -63.845858
Preferred Redshift & Derived Quantities [H₀ = 73 km/sec/Mpc], Ωmatter = 0.27, Ωvacuum = 0.73]					Redshift-independent Distances
z (Helio)	V (Helio) [km/s]	Reference	V (CMB) [km/s]	Hubble Distance (CMB) [Mpc]	# Measurements
0.00598 +/- 0.00003	1792.459357 +/- 8.693983	2006HIPAS.C...0000:	1528 +/- 20	20.93 +/- 1.49	4
Classifications
Object Type	Morphology	Reference	Activity Type	Reference	Other
G	SB(rs)bc	1991RC3.9.C...0000d			SB(r)bc
Quick-look Angular & Physical Diameters				Foreground Galactic Extinction (2011ApJ...737..103S)
Passband	Diameter ["]	Reference	Diameter [kpc]	A_λ [mag] V	A_λ [mag] K
ESO-LV "Quick Blue" IIa-O	184.08	1989ESOLV.C...0000L	24.77	0.040	0.004
Quick-look Photometry & Luminosities (brightest flux in each spectral region)
Spectral region	Band	Apparent mag or flux	Reference	Absolute Mag or νL_ν [W]	νL_ν [L_☉(bol)]
X-Ray
UV	NUV (GALEX) AB	14.69 +/- 0.01 mag	2007ApJS..173..185G	-17.53 +/- 0.03 [mag]	1.53E+09 +/- 2.31E+07
Visible	V (V_T^0)	11.86 mag	1991RC3.9.C...0000d	-2.04E+01 [mag]	8.52E+09
Near-IR	H	9.612 +/- 0.035 mag	20032MASX.C.......:	-22.61 +/- 0.05 [mag]	6.37E+09 +/- 2.23E+08
Far-IR
Radio
†Derived quantities are based on the median redshift-independent distance when available, otherwise the preferred redshift is used with the selected cosmological parameters (which can be changed in search options).
Cosmological params can be changed in search options.

Cross-identifications for NGC 7421

Coordinates for NGC 7421

Preferred Position: 22h56m54.33s -37d20m50.1s Equatorial J2000.0

Preferred Position of NGC 7421 20032MASX.C.......:

Reference Frame	Longitude	Latitude	Longitude	Latitude	Uncertainty Ellipse (arcsec)
	Decimal Degrees	Decimal Degrees	Sexigesimal	Sexigesimal	Semimajor (a)	Semiminor (b)	PA (deg)
RA/Dec Equatorial (J2000.0)	344.226375	-37.347250	22h56m54.33s	-37d20m50.1s	1.25E+00	1.25E+00	0
RA/Dec Equatorial (B1950.0)	343.526359	-37.614765	22h54m06.32s	-37d36m53.2s	1.25E+00	1.25E+00	0
Galactic	2.729182	-63.845858			1.25E+00	1.25E+00	0
Supergalactic	251.518872	12.293257			1.25E+00	1.25E+00	0
Ecliptic (J2000.0)	330.118901	-28.074820			1.25E+00	1.25E+00	0
Ecliptic (B1950.0)	329.417135	-28.072057			1.25E+00	1.25E+00	0

Measured Positions for NGC 7421

Redshifts and Derived Quantities for NGC 7421

Preferred Redshift: Z = 0.00598, H₀ = 73 km/sec/Mpc, Ωmatter = 0.27, Ωvacuum = 0.73

Quantities Derived from Preferred Redshift for NGC 7421

Calculated and Corrected Velocities
Type	Velocities	Reference
V (Heliocentric)	1792 ± 9 km/s	2006HIPAS.C...0000:
V (Kinematic LSR)	1790 ± 9 km/s	1986MNRAS.221.1023K
V (Galactocentric GSR)	1795 ± 9 km/s	1991RC3.9.C...0000d
V (Local Group)	1812 ± 9 km/s	1996AJ....111..794K
V (3K CMB)	1528 ± 20 km/s	1996ApJ...473..576F
V (Virgo Infall only)	1714 ± 11 km/s	2000ApJ...529..786M
V (Virgo + GA only)	1844 ± 14 km/s	2000ApJ...529..786M
V (Virgo + GA + Shapley)	1853 ± 14 km/s	2000ApJ...529..786M
Hubble Flow Distance and Distance Modulus (where H₀ = 73 km/sec/Mpc ± km/sec/Mpc)
Type	Distance	Modulus
D (Galactocentric GSR)	24.59 ± 1.73 Mpc	(m-M) = 31.95 ± 0.15 mag
D (Local Group)	24.82 ± 1.74 Mpc	(m-M) = 31.97 ± 0.15 mag
D (3K CMB)	20.93 ± 1.49 Mpc	(m-M) = 31.60 ± 0.15 mag
D (Virgo Infall only)	23.47 ± 1.65 Mpc	(m-M) = 31.85 ± 0.15 mag
D (Virgo + GA only)	25.26 ± 1.78 Mpc	(m-M) = 32.01 ± 0.15 mag
D (Virgo + GA + Shapley)	25.39 ± 1.78 Mpc	(m-M) = 32.02 ± 0.15 mag

Scale at Hubble Flow Distances
Type	Values
Scale (Galactocentric GSR)	119 pc/arcsec = 0.119 kpc/arcsec = 7.15 kpc/arcmin = 0.43 Mpc/degree
Scale (Local Group)	0.43 pc/arcsec = 0.120 kpc/arcsec = 7.22 kpc/arcmin = 0.43 Mpc/degree
Scale (3K CMB)	101 pc/arcsec = 0.101 kpc/arcsec = 6.09 kpc/arcmin = 0.37 Mpc/degree
Scale (Virgo Infall only)	114 pc/arcsec = 0.114 kpc/arcsec = 6.83 kpc/arcmin = 0.41 Mpc/degree
Scale (Virgo + GA only)	122 pc/arcsec = 0.122 kpc/arcsec = 7.35 kpc/arcmin = 0.44 Mpc/degree
Scale (Virgo + GA + Shapley)	123 pc/arcsec = 0.123 kpc/arcsec = 7.39 kpc/arcmin = 0.44 Mpc/degree
Cosmology-Corrected Quantities [H₀ = 73 km/sec/Mpc, Ω_matter = 0.27, Ω_vacuum = 0.73]
[Redshift 0.005096 as corrected to the Reference Frame defined by the 3K CMB]
Type	Values
Luminosity Distance	21 Mpc (m-M) = 31.61 mag
Angular-Size Distance	20.8 (m-M) = 31.59 mag
Co-Moving Radial Distance	20.9 (m-M) = 31.60 mag
Co-Moving Tangential Distance	20.9 (m-M) = 31.60 mag
Co-Moving Volume	3.83e-05 Gpc^3
Light Travel-Time	0.068 Gyr
Age at Redshift 0.005096	13.231 Gyr
Age of Universe	13.299 Gyr
Scale (Cosmology Corrected)	101 pc/arcsec = 0.101 kpc/arcsec = 6.05 kpc/arcmin = 0.36 Mpc/degree
Surface Brightness Dimming	Flux Density per Unit Area = 0.97987; Magnitude per Unit Area = 0.02208 mag

Measured Redshifts of NGC 7421

Images for object NGC 7421 (ngc7421)

POSS-II F (North), AAO-SES/SERC-ER (South), Red image
View in IRSA Finderchart

Image Credit: Caltech or AAO/ROE

Preview	File Size KB	Information	Lambda m	Clambda	Spectral Region	Band	FOV 1 arcmin	FOV 2 arcmin	Res. arcsec	Telescope	Refcode
Preview	File Size KB	Information	Lambda m	Clambda	Spectral Region	Band	FOV 1 arcmin	FOV 2 arcmin	Res. arcsec	Telescope	Refcode

Literature References for NGC 7421

External Resource Links for NGC 7421

Quick Look Photometry & Luminosities (brightest flux in each spectral region)	SED Plot

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Results for object NGC 7421 (ngc7421)

Images for object NGC 7421 (ngc7421)