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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 ARP 256†. More information in the tabs above.
Cross-identifications				Essential note
ARP 256; VV 352; VIII Zw 018; IRAS 00163-1039; IRAS F00163-1039
Coordinates for Preferred Position
Equatorial (J2000)					Galactic
RA, Dec	RA, Dec [Deg]	Unc Semi-major,minor ["]	Unc PA [deg]	Reference	Lon, Lat [deg]
00h18m50.5s, -10d22m09s	4.710417, -10.369167	2.80E+01, 2.80E+01	0	2011NEDR....1H...1C	96.767954, -71.565531
Preferred Redshift & Derived Quantities [H₀ = km/sec/Mpc], Ωmatter = , Ωvacuum = ]					Redshift-independent Distances
z (Helio)	V (Helio) [km/s]	Reference	V (CMB) [km/s]	Hubble Distance (CMB) [Mpc]	# Measurements
0.02730 +/- 0.00000	8184.035458 +/- 0.000000	2014ApJS..212...18B	7845 +/- 24	107.47 +/- 7.53
Classifications
Object Type	Morphology	Reference	Activity Type	Reference	Other
GPair	appearance of fission	1966ApJS...14....1A
Quick-look Angular & Physical Diameters				Foreground Galactic Extinction (2011ApJ...737..103S)
Passband	Diameter ["]	Reference	Diameter [kpc]	A_λ [mag] V	A_λ [mag] K
				0.099	0.011
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)	3.93 +/- 0.11 milliJy	2011ApJ...741..124H	7.47E+36 +/- 1.51E+36 [W]	1.94E+10 +/- 3.92E+09
Visible
Near-IR
Far-IR	100 microns (IRAS)	9.66 +/- 0.138 Jy	2003AJ....126.1607S	4.17E+37 +/- 8.37E+36 [W]	1.09E+11 +/- 2.18E+10
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 ARP 256

Coordinates for ARP 256

Preferred Position: 00h18m50.5s -10d22m09s Equatorial J2000.0

Preferred Position of ARP 256 2011NEDR....1H...1C

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)	4.710417	-10.369167	00h18m50.5s	-10d22m09s	2.80E+01	2.80E+01	0
RA/Dec Equatorial (B1950.0)	4.073676	-10.646778	00h16m17.7s	-10d38m48s	2.80E+01	2.80E+01	0
Galactic	96.767954	-71.565531			2.80E+01	2.80E+01	0
Supergalactic	283.963373	5.745679			2.80E+01	2.80E+01	0
Ecliptic (J2000.0)	0.147107	-11.377320			2.80E+01	2.80E+01	0
Ecliptic (B1950.0)	359.447220	-11.377859			2.80E+01	2.80E+01	0

Measured Positions for ARP 256

Redshifts and Derived Quantities for ARP 256

Preferred Redshift: Z = 0.02730, H₀ = km/sec/Mpc, Ωmatter = , Ωvacuum =

Quantities Derived from Preferred Redshift for ARP 256

Calculated and Corrected Velocities
Type	Velocities	Reference
V (Heliocentric)	8184 ± 0 km/s	2014ApJS..212...18B
V (Kinematic LSR)	8181 ± 0 km/s	1986MNRAS.221.1023K
V (Galactocentric GSR)	8250 ± 3 km/s	1991RC3.9.C...0000d
V (Local Group)	8304 ± 7 km/s	1996AJ....111..794K
V (3K CMB)	7845 ± 24 km/s	1996ApJ...473..576F
V (Virgo Infall only)	8125 ± 14 km/s	2000ApJ...529..786M
V (Virgo + GA only)	8053 ± 15 km/s	2000ApJ...529..786M
V (Virgo + GA + Shapley)	8044 ± 15 km/s	2000ApJ...529..786M
Hubble Flow Distance and Distance Modulus (where H₀ = km/sec/Mpc ± km/sec/Mpc)
Type	Distance	Modulus
D (Galactocentric GSR)	113.01 ± 7.91 Mpc	(m-M) = 35.27 ± 0.15 mag
D (Local Group)	113.76 ± 7.96 Mpc	(m-M) = 35.28 ± 0.15 mag
D (3K CMB)	107.47 ± 7.53 Mpc	(m-M) = 35.16 ± 0.15 mag
D (Virgo Infall only)	111.31 ± 7.79 Mpc	(m-M) = 35.23 ± 0.15 mag
D (Virgo + GA only)	110.32 ± 7.72 Mpc	(m-M) = 35.21 ± 0.15 mag
D (Virgo + GA + Shapley)	110.19 ± 7.71 Mpc	(m-M) = 35.21 ± 0.15 mag

Scale at Hubble Flow Distances
Type	Values
Scale (Galactocentric GSR)	548 pc/arcsec = 0.548 kpc/arcsec = 32.87 kpc/arcmin = 1.97 Mpc/degree
Scale (Local Group)	1.97 pc/arcsec = 0.552 kpc/arcsec = 33.09 kpc/arcmin = 1.99 Mpc/degree
Scale (3K CMB)	521 pc/arcsec = 0.521 kpc/arcsec = 31.26 kpc/arcmin = 1.88 Mpc/degree
Scale (Virgo Infall only)	540 pc/arcsec = 0.540 kpc/arcsec = 32.38 kpc/arcmin = 1.94 Mpc/degree
Scale (Virgo + GA only)	535 pc/arcsec = 0.535 kpc/arcsec = 32.09 kpc/arcmin = 1.93 Mpc/degree
Scale (Virgo + GA + Shapley)	534 pc/arcsec = 0.534 kpc/arcsec = 32.05 kpc/arcmin = 1.92 Mpc/degree
Cosmology-Corrected Quantities [H₀ = km/sec/Mpc, Ω_matter = , Ω_vacuum = ]
[Redshift 0.026169 as corrected to the ]
Type	Values
Luminosity Distance	110 Mpc (m-M) = 35.20 mag
Angular-Size Distance	104 (m-M) = 35.09 mag
Co-Moving Radial Distance	107 (m-M) = 35.14 mag
Co-Moving Tangential Distance	107 (m-M) = 35.14 mag
Co-Moving Volume	0.00512 Gpc^3
Light Travel-Time	0.344 Gyr
Age at Redshift 0.026169	12.955 Gyr
Age of Universe	13.299 Gyr
Scale (Cosmology Corrected)	505 pc/arcsec = 0.505 kpc/arcsec = 30.30 kpc/arcmin = 1.82 Mpc/degree
Surface Brightness Dimming	Flux Density per Unit Area = 0.90183; Magnitude per Unit Area = 0.1122 mag

Measured Redshifts of ARP 256

Classifications for ARP 256

Notes for ARP 256

Photometry & SED for ARP 256

Quick-look Photometry & SED plot for ARP 256

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

Photometry for ARP 256

Images for object ARP 256 (Arp 256)

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 ARP 256

External Resource Links for ARP 256

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