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Results for object NGC 0021 (NGC 21)

Overview
Cross-IDs (24)
Coordinates (19)
Redshifts (15)
Distances (15)
Classifications (23)
Galactic Extinctions
Notes (3)
Diameters (7)
Photometry & SED (52)
Spectra (3)
Images (3)
References (72)
External Links
Survey Coverage

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

Selected data and derived quantities for NGC 0021†. More information in the tabs above.
Cross-identifications				Essential note
NGC 0021; NGC 0029; UGC 00100; CGCG 499-066; CGCG 0008.1+3305
Coordinates for Preferred Position
Equatorial (J2000)					Galactic
RA, Dec	RA, Dec [Deg]	Unc Semi-major,minor ["]	Unc PA [deg]	Reference	Lon, Lat [deg]
00h10m46.90s, +33d21m10.2s	2.695417, 33.352833	1.25E+00, 1.25E+00	0	20032MASX.C.......:	113.252508, -28.753570
Preferred Redshift & Derived Quantities [H₀ = 67.8 km/sec/Mpc], Ωmatter = 0.308, Ωvacuum = 0.692]					Redshift-independent Distances
z (Helio)	V (Helio) [km/s]	Reference	V (CMB) [km/s]	Hubble Distance (CMB) [Mpc]	# Measurements
0.01591 +/- 0.00001	4769.998468 +/- 3.897302	1999PASP..111..438F	4448 +/- 23	65.60 +/- 4.60	15
Classifications
Object Type	Morphology	Reference	Activity Type	Reference	Other
G	SAB(s)bc:	1991RC3.9.C...0000d			SAB(s)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
RC3 D_0 (blue)	106.70	1991RC3.9.C...0000d	36.99	0.106	0.012
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
Visible	I	12.01 mag	2007ApJS..172..599S	-2.22E+01 [mag]	2.41E+10
Near-IR	H	10.614 +/- 0.031 mag	20032MASX.C.......:	-23.65 +/- 0.15 [mag]	1.69E+10 +/- 1.10E+09
Far-IR	100 microns (IRAS)	2.359E+00 +/- 9 % Jy	1990IRASF.C...0000M	4.33E+36 +/- 4.64E+35 [W]	1.13E+10 +/- 1.21E+09
Radio	1.4GHz	9.1 +/- 1.1 milliJy	1998AJ....115.1693C	7.79E+30 +/- 1.05E+30 [W]	2.03E+04 +/- 2.72E+03
†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 0021

Coordinates for NGC 0021

Preferred Position: 00h10m46.90s +33d21m10.2s Equatorial J2000.0 ()

Preferred Position of NGC 0021

Reference Frame	Longitude	Latitude	Longitude	Latitude	Uncertainty Ellipse (arcsec)
	Decimal Degrees	Decimal Degrees	Sexagesimal	Sexagesimal	Semimajor (a)	Semiminor (b)	PA (deg)
RA/Dec Equatorial (J2000.0)	2.695417	33.352833	00h10m46.90s	+33d21m10.2s	1.25E+00	1.25E+00	0
RA/Dec Equatorial (B1950.0)	2.047188	33.074716	00h08m11.32s	+33d04m29.0s	1.25E+00	1.25E+00	0
Galactic	113.252508	-28.753570			1.25E+00	1.25E+00	0
Supergalactic	327.104995	17.643612			1.25E+00	1.25E+00	0
Ecliptic (J2000.0)	16.977426	29.261758			1.25E+00	1.25E+00	0
Ecliptic (B1950.0)	16.282291	29.259422			1.25E+00	1.25E+00	0

Measured Positions for NGC 0021

Redshifts and Derived Quantities for NGC 0021

Preferred Redshift: Z = 0.01591, H₀ = 67.8 km/sec/Mpc, Ωmatter = 0.308, Ωvacuum = 0.692

Quantities Derived from Preferred Redshift for NGC 0021

Calculated and Corrected Velocities
Type	Velocities	Reference
V (Heliocentric)	4770 ± 4 km/s	1999PASP..111..438F
V (Kinematic LSR)	4775 ± 4 km/s	1986MNRAS.221.1023K
V (Galactocentric GSR)	4950 ± 8 km/s	1991RC3.9.C...0000d
V (Local Group)	5040 ± 17 km/s	1996AJ....111..794K
V (3K CMB)	4448 ± 23 km/s	1996ApJ...473..576F
V (Virgo Infall only)	4934 ± 18 km/s	2000ApJ...529..786M
V (Virgo + GA only)	4741 ± 23 km/s	2000ApJ...529..786M
V (Virgo + GA + Shapley)	4722 ± 23 km/s	2000ApJ...529..786M
Hubble Flow Distance and Distance Modulus (where H₀ = 67.8 km/sec/Mpc ± km/sec/Mpc)
Type	Distance	Modulus
D (Galactocentric GSR)	73.02 ± 5.11 Mpc	(m-M) = 34.32 ± 0.15 mag
D (Local Group)	74.33 ± 5.21 Mpc	(m-M) = 34.36 ± 0.15 mag
D (3K CMB)	65.60 ± 4.60 Mpc	(m-M) = 34.08 ± 0.15 mag
D (Virgo Infall only)	72.77 ± 5.10 Mpc	(m-M) = 34.31 ± 0.15 mag
D (Virgo + GA only)	69.93 ± 4.90 Mpc	(m-M) = 34.22 ± 0.15 mag
D (Virgo + GA + Shapley)	69.65 ± 4.88 Mpc	(m-M) = 34.21 ± 0.15 mag

Scale at Hubble Flow Distances
Type	Values
Scale (Galactocentric GSR)	354 pc/arcsec = 0.354 kpc/arcsec = 21.24 kpc/arcmin = 1.27 Mpc/degree
Scale (Local Group)	360 pc/arcsec = 0.360 kpc/arcsec = 21.62 kpc/arcmin = 1.30 Mpc/degree
Scale (3K CMB)	318 pc/arcsec = 0.318 kpc/arcsec = 19.08 kpc/arcmin = 1.14 Mpc/degree
Scale (Virgo Infall only)	353 pc/arcsec = 0.353 kpc/arcsec = 21.17 kpc/arcmin = 1.27 Mpc/degree
Scale (Virgo + GA only)	339 pc/arcsec = 0.339 kpc/arcsec = 20.34 kpc/arcmin = 1.22 Mpc/degree
Scale (Virgo + GA + Shapley)	338 pc/arcsec = 0.338 kpc/arcsec = 20.26 kpc/arcmin = 1.22 Mpc/degree
Cosmology-Corrected Quantities [H₀ = 67.8 km/sec/Mpc, Ω_matter = 0.308, Ω_vacuum = 0.692]
[Redshift 0.014836 as corrected to the Reference Frame defined by the 3K CMB]
Type	Values
Luminosity Distance	66.3 Mpc (m-M) = 34.11 mag
Angular-Size Distance	64.4 (m-M) = 34.05 mag
Co-Moving Radial Distance	65.4 (m-M) = 34.08 mag
Co-Moving Tangential Distance	65.4 (m-M) = 34.08 mag
Co-Moving Volume	0.00117 Gpc^3
Light Travel-Time	0.212 Gyr
Age at Redshift 0.014836	13.593 Gyr
Age of Universe	13.804 Gyr
Scale (Cosmology Corrected)	312 pc/arcsec = 0.312 kpc/arcsec = 18.74 kpc/arcmin = 1.12 Mpc/degree
Surface Brightness Dimming	Flux Density per Unit Area = 0.94279; Magnitude per Unit Area = 0.06396 mag

Measured Redshifts of NGC 0021

Images for object NGC 0021 (NGC 21)

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 0021

External Resource Links for NGC 0021

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Help Detailed Information for a Named Object

Results for object NGC 0021 (NGC 21)

Images for object NGC 0021 (NGC 21)