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Position Reference:2009A&A...495..505A

Reference    Frame     Longitude    Latitude        RA           DEC      Uncertainty Ellipse (arcsec)
                       (degrees)   (degrees)                              Semimajor Semiminor  PA(deg)
Equatorial (B1950.0)   27.211088  -18.841432  01h48m50.66s  -18d50m29.2s  1.51E+00  1.51E+00    0
Equatorial (J2000.0)   27.808167  -18.594472  01h51m13.96s  -18d35m40.1s  1.51E+00  1.51E+00    0
Ecliptic   (B1950.0)   17.695600  -27.935450                              1.51E+00  1.51E+00    0
Ecliptic   (J2000.0)   18.397327  -27.932877                              1.51E+00  1.51E+00    0
Galactic              184.247783  -73.817979                              1.51E+00  1.51E+00    0
SuperGalactic         281.550264  -17.932638                              1.51E+00  1.51E+00    0

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Galactic Extinction from the Schlafly & Finkbeiner 2011, Appendix; 2011ApJ...737..103S (SF11) recalibration 
of the Schlegel, Finkbeiner & Davis 1998, Appendix B; 1998ApJ...500..525S (SFD98) infrared-based dust map. 
The map is based on dust emission from COBE/DIRBE and IRAS/ISSA; 
the recalibration assumes a Fitzpatrick (1999PASP..111...63F) reddening law with Rv = 3.1 and different source spectrum than SFD98.



    
 
L  a  n  d  o  l  t
S  D  S  S
U  K  I  R  T
Filter [µm]
U (0.35)
B (0.43)
V (0.54)
R (0.64)
I (0.80)
u (0.36)
g (0.47)
r (0.62)
i (0.75)
z (0.89)
J (1.25)
H (1.66)
K (2.19)
L' (3.78)
Aλ [mag]
0.057
0.048
0.036
0.029
0.020
0.056
0.044
0.030
0.022
0.017
0.009
0.006
0.004
0.002

  

Show/Hide Aλ magnitudes in all 88 photometric bands based on SF11
 


Bandpass [µm]
Aλ [mag]
Landolt
U
(0.35)
 0.057
Landolt
B
(0.43)
 0.048
Landolt
V
(0.54)
 0.036
Landolt
R
(0.64)
 0.029
Landolt
I
(0.80)
 0.020
CTIO
U
(0.37)
 0.054
CTIO
B
(0.43)
 0.048
CTIO
V
(0.55)
 0.035
CTIO
R
(0.65)
 0.028
CTIO
I
(0.80)
 0.020
UKIRT
J
(1.25)
 0.009
UKIRT
H
(1.66)
 0.006
UKIRT
K
(2.19)
 0.004
UKIRT
L'
(3.78)
 0.002
Gunn
g
(0.52)
 0.039
Gunn
r
(0.66)
 0.027
Gunn
i
(0.79)
 0.021
Gunn
z
(0.91)
 0.016
Spinrad
R_S
(0.69)
 0.025
Stromgren
u
(0.35)
 0.057
Stromgren
b
(0.47)
 0.044
Stromgren
v
(0.41)
 0.050
Stromgren
beta
(0.49)
 0.042
Stromgren
y
(0.55)
 0.036
SDSS
u
(0.36)
 0.056
SDSS
g
(0.47)
 0.044
SDSS
r
(0.62)
 0.030
SDSS
i
(0.75)
 0.022
SDSS
z
(0.89)
 0.017
DSS-II
g
(0.46)
 0.045
DSS-II
r
(0.65)
 0.028
DSS-II
i
(0.81)
 0.020
PS1
g
(0.49)
 0.042
PS1
r
(0.62)
 0.030
PS1
i
(0.75)
 0.022
PS1
z
(0.87)
 0.017
PS1
y
(0.97)
 0.014
PS1
w
(0.62)
 0.031
LSST
u
(0.37)
 0.055
LSST
g
(0.48)
 0.043
LSST
r
(0.62)
 0.030
LSST
i
(0.75)
 0.022
LSST
z
(0.87)
 0.018
LSST
y
(0.97)
 0.014
WFPC2
F300W
(0.31)
 0.065
WFPC2
F450W
(0.46)
 0.045
WFPC2
F555W
(0.54)
 0.036
WFPC2
F606W
(0.60)
 0.032
WFPC2
F702W
(0.69)
 0.026
WFPC2
F814W
(0.79)
 0.021
WFC3
F105W
(1.04)
 0.013
WFC3
F110W
(1.12)
 0.012
WFC3
F125W
(1.23)
 0.010
WFC3
F140W
(1.37)
 0.008
WFC3
F160W
(1.53)
 0.007
WFC3
F200LP
(0.55)
 0.039
WFC3
F218W
(0.22)
 0.103
WFC3
F225W
(0.24)
 0.092
WFC3
F275W
(0.27)
 0.073
WFC3
F300X
(0.29)
 0.069
WFC3
F336W
(0.34)
 0.059
WFC3
F350LP
(0.59)
 0.035
WFC3
F390W
(0.40)
 0.052
WFC3
F438W
(0.43)
 0.048
WFC3
F475W
(0.48)
 0.043
WFC3
F475X
(0.50)
 0.041
WFC3
F555W
(0.53)
 0.038
WFC3
F600LP
(0.74)
 0.024
WFC3
F606W
(0.59)
 0.033
WFC3
F625W
(0.62)
 0.030
WFC3
F775W
(0.76)
 0.022
WFC3
F814W
(0.80)
 0.020
WFC3
F850LP
(0.91)
 0.016
ACS
clear
(0.62)
 0.032
ACS
F435W
(0.43)
 0.048
ACS
F475W
(0.48)
 0.043
ACS
F550M
(0.56)
 0.035
ACS
F555W
(0.54)
 0.037
ACS
F606W
(0.59)
 0.033
ACS
F625W
(0.63)
 0.029
ACS
F775W
(0.77)
 0.022
ACS
F814W
(0.80)
 0.020
ACS
F850LP
(0.90)
 0.016
DES
g
(0.48)
 0.043
DES
r
(0.64)
 0.029
DES
i
(0.78)
 0.021
DES
z
(0.91)
 0.016
DES
Y
(0.99)
 0.014


For completeness, we include the original SFD98 values:


    
 
L  a  n  d  o  l  t
S  D  S  S
U  K  I  R  T
Filter [µm]
U (0.34)
B (0.44)
V (0.54)
R (0.65)
I (0.81)
u (0.35)
g (0.49)
r (0.63)
i (0.78)
z (0.93)
J (1.27)
H (1.67)
K (2.22)
L' (3.81)
Aλ [mag]
0.072
0.057
0.044
0.035
0.026
0.068
0.050
0.036
0.028
0.020
0.012
0.008
0.005
0.002


Galactic Extinction based on H I Column Densities and Galaxy Counts 
(Burstein & Heiles; 1982AJ.....87.1165B) assuming Rv = 3.1:
AB = 0.000 mag 

See Notes on Galactic Extinction for important caveats.

Helio. Radial Velocity     :    137005 +/-      210 km/s UUN  
Redshift                   :  0.457000 +/- 0.000700  UUN   2022ApJ...940...56F
Major Diameter (arcmin)    :      
Minor Diameter (arcmin)    :      
Magnitude and Filter       : 20.5R
Classifications            : E                   

NOTE: This information is indicative only. With the exception of the
      redshift they are unreferenced and highly inhomogeneous as to
      their origin. The Radial Velocity (when available) is computed
      from the listed redshift. The remaining values are designed to
      orient the user with a quick-look, overall assessment of the
      general properties of the object in question. They are not
      averages nor are they standardized in any way.

Additional detailed measurements with references are also available by clicking below:
5 Redshift data point(s)      8 photometric data point(s)      

Calculated and Corrected Velocities
V (Heliocentric)           :  137005 +/-    210 km/s UUN  2022ApJ...940...56F
V (Kinematic LSR)          :  136994 +/-    210 km/s UUN  1986MNRAS.221.1023K
V (Galactocentric GSR)     :  136991 +/-    210 km/s UUN  1991RC3.9.C...0000d
V (Local Group)            :  137024 +/-    210 km/s UUN  1996AJ....111..794K
V (3K CMB)                 :  136751 +/-    211 km/s UUN  1996ApJ...473..576F
V (Virgo Infall only)      :  136838 +/-    210 km/s UUN  2000ApJ...529..786M
V (Virgo + GA only)        :  136670 +/-    211 km/s UUN  2000ApJ...529..786M
V (Virgo + GA + Shapley)   :  136624 +/-    211 km/s UUN  2000ApJ...529..786M

Hubble Flow Distance and Distance Modulus (where Ho =   73.0 +/-   5 km/sec/Mpc)
D (Galactocentric GSR)     :  1876.6 +/-  131.4 Mpc      (m-M) = 41.37 +/- 0.15 mag
D (Local Group)            :  1877.0 +/-  131.4 Mpc      (m-M) = 41.37 +/- 0.15 mag
D (3K CMB)                 :  1873.3 +/-  131.2 Mpc      (m-M) = 41.36 +/- 0.15 mag
D (Virgo Infall only)      :  1874.5 +/-  131.2 Mpc      (m-M) = 41.36 +/- 0.15 mag
D (Virgo + GA only)        :  1872.2 +/-  131.1 Mpc      (m-M) = 41.36 +/- 0.15 mag
D (Virgo + GA + Shapley)   :  1871.6 +/-  131.0 Mpc      (m-M) = 41.36 +/- 0.15 mag

Scale at Hubble Flow Distances
Scale (Galactocentric GSR) :    9098 pc/arcsec =  9.098 kpc/arcsec = 545.88 kpc/arcmin =  32.75 Mpc/degree
Scale (Local Group)        :    9100 pc/arcsec =  9.100 kpc/arcsec = 546.01 kpc/arcmin =  32.76 Mpc/degree
Scale (3K CMB)             :    9082 pc/arcsec =  9.082 kpc/arcsec = 544.92 kpc/arcmin =  32.70 Mpc/degree
Scale (Virgo Infall only)  :    9088 pc/arcsec =  9.088 kpc/arcsec = 545.27 kpc/arcmin =  32.72 Mpc/degree
Scale (Virgo + GA only)    :    9077 pc/arcsec =  9.077 kpc/arcsec = 544.60 kpc/arcmin =  32.68 Mpc/degree
Scale(Virgo + GA + Shapley):    9074 pc/arcsec =  9.074 kpc/arcsec = 544.41 kpc/arcmin =  32.66 Mpc/degree











To Search for Nearby Objects (Physical Companions):
Enter Your Preferred Values and click on "Submit Environment Search" button 

Search for Objects within +/-arcmin where 100 kpc =  0.184 arcmin  
and Selected Redshift, defined by the Velocity Range:
from  to km/sec where V(Heliocentric) = 137005 km/sec  






Cosmology-Corrected Quantities [Ho =  73.00 km/sec/Mpc, Ωmatter =   0.27, Ωvacuum =   0.73]
[Redshift 0.456153 as corrected to the Reference Frame defined by the 3K Microwave Background Radiation]
Luminosity Distance        :     2458 Mpc      (m-M) = 41.95 mag
Angular-Size Distance      :     1159 Mpc      (m-M) = 40.32 mag
Co-Moving Radial Distance  :     1688 Mpc      (m-M) = 41.14 mag
Co-Moving Tangential Dist. :     1688 Mpc      (m-M) = 41.14 mag
Co-Moving Volume           : 20.1 Gpc^3
Light Travel-Time          :    4.567 Gyr
Age at Redshift 0.456153   :    8.732 Gyr
Age of Universe            :   13.299 Gyr
Scale (Cosmology Corrected):    5620 pc/arcsec =  5.620 kpc/arcsec = 337.20 kpc/arcmin =  20.23 Mpc/degree
Surface Brightness Dimming : Flux Density per Unit Area =  0.22242; Magnitude per Unit Area = 1.632 mag







To change Cosmological Input Parameters for Derived Quantities:
Enter Your Preferred Values and click on "Submit Changed Hubble Parameters for this object" button 

HoΩmatterΩvacuum
    


Correct Redshift To the Reference Frame defined by:
 3K CMB
 Virgo Infall only
 (Virgo + GA) only
 Virgo + GA + Shapley


as Input for Calculation of the Distances and Cosmology-Corrected Quantities 

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