Date and Time of the Query: 2022-01-22 T21:29:14 PST
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You have selected the following parameters to search on:

Parameters for Distances and Cosmology: Ho= 73.0; Ωmatter = 0.27; Ωvacuum = 0.73;
Derived Quantities use a Redshift corrected to a Reference Frame defined by the 3K CMB

NED results for object NGC 3998

1 objects found in NED.    


 Row          Object Name                 EquJ2000.0       Object  Velocity/Redshift    Mag./  Separ.               Number of                                 Row 
 No.     (* => Essential Note)       RA               DEC  Type     km/s       z   Qual Filter arcmin Refs Notes Phot Posn Vel/z Diam Assoc Images   Spectra  No. 
1    NGC 3998                       11h57m56.1s +55d27m13s G        1048  0.003496      11.61    ...   570    22  224   54    34   10     0 Retrieve Retrieve 1   

Detailed information for each object

Object No. 1 - NGC 3998

INDEX for NGC 3998
Essential Data (jump to sub-section of this query report):

   Essential Note    
   Basic Data   
   Quantities Derived from Redshift    
   Redshift-Independent Distances
   Quick-Look Photometry and Luminosities
   Quick-Look Angular and Physical Sizes
   Foreground Galactic Extinction    
   External Services
Detailed Data (NED queries):
  • Images
  • 224 Photometric data point(s) and SED   
  • Spectra   
    Redshift-Independent Distances
    570 Reference(s)   
    54 Position data point(s)
    34 Redshift data point(s)   
    10 Diameter data point(s)   
    22 Note(s)   
    UGC data    
    RC3 data    

    ESSENTIAL NOTE for NGC 3998 (Back to INDEX)

    Object Names Type Object Names Type
    NGC 3998G RX J1157.9+5527 XrayS
    UGC 06946 G 1RXS J115756.1+552717 XrayS
    CGCG 269-025 G 2PBC J1158.1+5527 XrayS
    CGCG 1155.3+5543 G 2XMM J115756.1+552714 XrayS
    MCG +09-20-046 G 2XMMp J115756.1+552714 XrayS
    WISEA J115756.13+552713.0 IrS 1XMM J115756.2+552711 XrayS
    2MASX J11575616+5527128 IrS 1AXG J115757+5527 XrayS
    2MASS J11575612+5527128 IrS 1ES 1155+557 XrayS
    IRAS F11553+5543 IrS XSS J11570+5514 XrayS
    LDCE 0867 NED055 G CXO J115756.11+552713.1 XrayS
    HDCE 0706 NED021 G SWIFT J1157.8+5529 XrayS
    PGC1 0037642 NED001 G SWIFT J1158.0+5526 XrayS
    LQAC 179+055 007 G LGG 241:[G93] 007 G
    CGRaBS J1157+5527 G NGC 3998:[R97] 09 XrayS
    HOLM 310A G [M98j] 170 NED27 G
    NSA 140507 G RX J1157.9+5527:[BEV98] 001 G
    PGC 037642 G NGC 3998:[RW2000] X-02 XrayS
    RBS 1053 G [VCV2001] J115756.1+552713 G
    SSTSL2 J115756.11+552712.8 IrS RX J1157.9+5527:[ZEH2003] 01 G
    UZC J115756.2+552713 G [SRM2005] J115756.13+552712.9 G
    87GB 115521.8+554353 RadioSNGC 3998:[LB2005] X01 XrayS
    87GB[BWE91] 1155+5543 RadioS[VCV2006] J115756.1+552713 G
    [WB92] 1155+5543 RadioS[HRT2007] J115757+552713 RadioS
    NVSS J115756+552712 RadioS[GMM2009b] 32 G
    6C B115520.5+554340 RadioSNGC 3998:[L2011a] X0001 XrayS
    CRATES J1157+5527 RadioSv2MCG 47:[DMP2012] 1 G
    CRATES J115756.13+552712.9 RadioS[BTM2013] 0579 XrayS
    GB6 J1157+5527 RadioS[AHG2014] B165 G
    ILT J115756.1+552713.2 RadioS[MGD2014] 1155.3+5543 RadioS
    OCARS 1155+557 RadioSUMa Cluster:[PRL2014] U084 G
    RGB J1157+554 RadioS[DF2016] 0763 G
    VIPS 0499 RadioSNGC 3998:[WLQ2016] X0001 XrayS
    VIPS J11579+5527 RadioSHMCG 174:[DZT2018] 2 G
    2CXO J115756.1+552712 XrayS    
    CXO J115756.1+552713 XrayS    
    CXOGSG J115756.1+552713 XrayS    

    COORDINATES for NGC 3998 (Back to INDEX)

    Position Reference:2011AJ....142...89P

    Reference    Frame     Longitude    Latitude        RA           DEC      Uncertainty Ellipse (arcsec)
                           (degrees)   (degrees)                              Semimajor Semiminor  PA(deg)
    Equatorial (B1950.0) 178.8373159  55.7318789 11h55m20.9558s +55d43m54.764s  1.75E-03  1.00E-03   90
    Equatorial (J2000.0) 179.4838888  55.4535894 11h57m56.1333s +55d27m12.922s  1.75E-03  1.00E-03   90
    Ecliptic   (B1950.0) 148.9222193  48.9062161                              1.75E-03  1.00E-03   53
    Ecliptic   (J2000.0) 149.6273773  48.9091136                              1.75E-03  1.00E-03   53
    Galactic             138.1723509  60.0634376                              1.75E-03  1.00E-03  114
    SuperGalactic         59.9367799   5.0743481                              1.75E-03  1.00E-03   21
    Additional detailed measurements with references are also available by clicking below:
    54 Position data point(s)


    11 Distances found in NED View 11 Individual Distance Measurement(s) for NGC 3998

    Summary Statistics computed by NED from 11 Distance(s) in the literature:
    NOTE: These summary statistics are provided for "quick-look" reference only;
    they are based exclusively on original values, as published.
    No homogenization or corrections have been applied.

    NGC 3998 Distance Modulus
    Metric Distance
    Mean 31.33 20.075
    Std. Dev. 0.92 8.887
    Min. 29.80 9.120
    Max. 32.92 38.400
    Median 31.26 17.900

    TypeAs PublishedNED HomogenizedFlagReference Code
    HierarchyRGin a radial-velocity based grouping...1998Afz....41..308M
    KinematicsHI line widthHI line width...1985A&A...142....1K
    Galaxy MorphologySA0^0(r)?SA0^0(r)?...1991RC3.9.C...0000d
    Activity TypeFlat-Spectrum Radio Source,Flat-Spectrum Radio Source...2007ApJS..171...61H
    Distance IndicatorTully-FisherTully-Fisher...2007A&A...465...71T
    29 Detailed Classification(s)

    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 tS D S SU 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]0.0710.0590.0450.0360.0250.0690.0540.0370.0280.0210.0120.0070.0050.003
    Show/Hide Aλ magnitudes in all 88 photometric bands based on SF11
    For completeness, we include the original SFD98 values:
    L a n d o l tS D S SU 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]0.0870.0690.0530.0430.0310.0820.0610.0440.0330.0240.0140.0090.0060.002

    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.

    BASIC DATA for NGC 3998 (Back to INDEX)
    Helio. Radial Velocity     :      1048 +/-        5 km/s      
    Redshift                   :  0.003496 +/- 0.000017        2011MNRAS.413..813C
    Major Diameter (arcmin)    :   2.7
    Minor Diameter (arcmin)    :   2.2
    Magnitude and Filter       : 11.61
    Classifications            : SA(r)0^0^?;Sy1;LINER
    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:
    34 Redshift data point(s)      224 photometric data point(s)      10 Diameter data point(s)      

    Calculated and Corrected Velocities
    V (Heliocentric)           :    1048 +/-      5 km/s      2011MNRAS.413..813C
    V (Kinematic LSR)          :    1056 +/-      5 km/s      1986MNRAS.221.1023K
    V (Galactocentric GSR)     :    1128 +/-      6 km/s      1991RC3.9.C...0000d
    V (Local Group)            :    1140 +/-      8 km/s      1996AJ....111..794K
    V (3K CMB)                 :    1216 +/-     13 km/s      1996ApJ...473..576F
    V (Virgo Infall only)      :    1420 +/-     21 km/s      2000ApJ...529..786M
    V (Virgo + GA only)        :    1510 +/-     22 km/s      2000ApJ...529..786M
    V (Virgo + GA + Shapley)   :    1519 +/-     22 km/s      2000ApJ...529..786M
    Hubble Flow Distance and Distance Modulus (where Ho =   73.0 +/-   5 km/sec/Mpc)
    D (Galactocentric GSR)     :    15.5 +/-    1.1 Mpc      (m-M) = 30.94 +/- 0.15 mag
    D (Local Group)            :    15.6 +/-    1.1 Mpc      (m-M) = 30.97 +/- 0.15 mag
    D (3K CMB)                 :    16.7 +/-    1.2 Mpc      (m-M) = 31.11 +/- 0.15 mag
    D (Virgo Infall only)      :    19.4 +/-    1.4 Mpc      (m-M) = 31.44 +/- 0.15 mag
    D (Virgo + GA only)        :    20.7 +/-    1.5 Mpc      (m-M) = 31.58 +/- 0.15 mag
    D (Virgo + GA + Shapley)   :    20.8 +/-    1.5 Mpc      (m-M) = 31.59 +/- 0.15 mag
    Scale at Hubble Flow Distances
    Scale (Galactocentric GSR) :      75 pc/arcsec =  0.075 kpc/arcsec =   4.49 kpc/arcmin =   0.27 Mpc/degree
    Scale (Local Group)        :      76 pc/arcsec =  0.076 kpc/arcsec =   4.54 kpc/arcmin =   0.27 Mpc/degree
    Scale (3K CMB)             :      81 pc/arcsec =  0.081 kpc/arcsec =   4.84 kpc/arcmin =   0.29 Mpc/degree
    Scale (Virgo Infall only)  :      94 pc/arcsec =  0.094 kpc/arcsec =   5.66 kpc/arcmin =   0.34 Mpc/degree
    Scale (Virgo + GA only)    :     100 pc/arcsec =  0.100 kpc/arcsec =   6.02 kpc/arcmin =   0.36 Mpc/degree
    Scale(Virgo + GA + Shapley):     101 pc/arcsec =  0.101 kpc/arcsec =   6.05 kpc/arcmin =   0.36 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 = 16.517 arcmin and Selected Redshift, defined by the Velocity Range: from to km/sec where V(Heliocentric) = 1048 km/sec
    Cosmology-Corrected Quantities [Ho = 73.00 km/sec/Mpc, Ωmatter = 0.27, Ωvacuum = 0.73] [Redshift 0.004055 as corrected to the Reference Frame defined by the 3K Microwave Background Radiation] Luminosity Distance : 16.7 Mpc (m-M) = 31.11 mag Angular-Size Distance : 16.6 Mpc (m-M) = 31.10 mag Co-Moving Radial Distance : 16.6 Mpc (m-M) = 31.11 mag Co-Moving Tangential Dist. : 16.6 Mpc (m-M) = 31.11 mag Co-Moving Volume : 1.93e-05 Gpc^3 Light Travel-Time : 0.054 Gyr Age at Redshift 0.004055 : 13.245 Gyr Age of Universe : 13.299 Gyr Scale (Cosmology Corrected): 80 pc/arcsec = 0.080 kpc/arcsec = 4.82 kpc/arcmin = 0.29 Mpc/degree Surface Brightness Dimming : Flux Density per Unit Area = 0.98394; Magnitude per Unit Area = 0.01757 mag
    To change Cosmological Input Parameters for Derived Quantities: Enter Your Preferred Values and click on "Submit Changed Hubble Parameters for this object" button
    Correct Redshift To the Reference Frame defined by: as Input for Calculation of the Distances and Cosmology-Corrected Quantities


    The brightest flux in each of the following spectral regions, when available:
    Gamma-Ray (ν > 2E19 Hz); X-Ray (2E19 Hz > ν > 2E16 Hz); Ultraviolet (2E16 Hz > ν > 9E14 Hz); Visual (9E14 Hz > ν > 3E14 Hz);
    Near-Infrared (3E14 Hz > ν > 6E13 Hz); Mid-Infrared (6E13 Hz > ν > 7.5E12 Hz); Far-Infrared (7.5E12 Hz > ν > 1E12 Hz);
    Sub-Millimeter (1E12 Hz > ν > 3E11 Hz); Millimeter (3E11 Hz > ν > 3E10 Hz); Radio (3E10 Hz > ν).

    Band Apparent Mag or Flux Refcode Absolute Mag or νLν [W] νLν [L(Bolometric)]
    Gamma-Ray14-195 keV (Swift) 3.03E-11 +/- 0.48E-11 erg/s/cm^2^ 2010ApJS..186..378T 1.46E+35 +/- 4.54E+34 [W] 3.81E+08 +/- 1.18E+08
    X-Ray0.1-10 keV Chandra 1.8559E-11 +/- 2.2855E-13 erg/cm^2/s 2020CSC...C2..0000: 8.96E+34 +/- 2.39E+34 [W] 2.33E+08 +/- 6.23E+07
    Ultravioletm(2000) 13.3 +/- 0.7 mag 1987A&A...180...12D-18.03 +/- 0.97 [mag] 4.08E+08 +/- 3.84E+08
    VisualF547M (HST/WFPC2) 3.10E-12 erg cm^-2^ s^-1^ 2006A&A...453...27C 1.50E+34 [W] 3.89E+07
    Near-InfraredH 7.584 +/- 0.008 mag 20032MASX.C.......:-23.75 +/- 0.67 [mag] 2.16E+10 +/- 5.78E+09
    Mid-Infrared18 microns (AKARI) 196.59 +/- 19.10 milliJy 2017A&A...605A..74K 1.59E+35 +/- 4.51E+34 [W] 4.13E+08 +/- 1.17E+08
    Far-Infrared100 microns (IRAS) 1.150 +/- 0.124 Jy 1994PrivC.U..J....K 1.66E+35 +/- 4.79E+34 [W] 4.33E+08 +/- 1.25E+08
    Radio4.86 GHz (VLA) 302 milliJy 2012AJ....143...78K 7.08E+31 [W] 1.84E+05
    NOTE: The above quantities are derived using an estimated Distance Modulus of (31.33 +/- 0.92) mag corresponding to
    a Metric Distance of (20.075 +/- 8.887) Mpc using the Average NED-D value.
    The quantities quoted above have not necessarily been corrected for foreground extinction, and no K-Corrections have been applied.

    View details and SED for 224 Photometric data point(s) available in NED.


    The largest diameters in the Visual and Near-Infrared spectral regions, when available:

    Passband Apparent Major Axis
    (2a) [arcsec]
    Apparent Minor Axis
    (2b) [arcsec]
    Reference Level RefcodePhysical Major Axis
    (2a) [kpc]
    Physical Minor Axis
    (2b) [kpc]
    POSS1 103a-O 180.00149.40140 About 25.0 B-mag arcsec^-2^ 1973UGC...C...0000N17.5214.54
    K_s (2MASS "total") 190.60148.67130 Diameter for "total" magnitude 20032MASX.C.......:20032MASX.C.......:18.5514.47
    NOTE: Physical diameters are derived using a scale of 0.0973 kpc/arcsec based on Average NED-D Metric Distance of (20.075 +/- 8.887) Mpc.
    The quantities quoted above have not necessarily been corrected for foreground extinction.

    View details for 10 Diameter data point(s) available in NED.

    Resources for Object NamesSite/Service
    Query SIMBAD by primary NED object name -- NGC 3998SIMBAD (CDS, Strasbourg, France)
    Revised New General Catalogue -- NGC 3998VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    Uppsala General Catalog -- UGC 06946 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    Original Zwicky Catalog -- CGCG 269-025 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    Query UZC Spectral Archive (60 arcsec search radius)Updated Zwicky Catalog Data (Harvard/SAO)
    Morphological Catalog of Galaxies -- MCG +09-20-046 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    2MASS Extended Source Images (JHKs) -- 2MASX J11575616+5527128 NASA/IPAC Infrared Science Archive (IRSA)
    IRAS Faint Source Catalog -- IRAS F11553+5543 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    Catalogue of Principal Galaxies -- PGC 037642 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    Retrieve mean data from LEDA -- PGC 037642 The Lyon/Meudon Extragalactic Database (LEDA)
    NRAO/VLA Sky Survey (NVSS)
    GB6 catalog of radio sources -- GB6 J1157+5527 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    Query GALEX (NUV/FUV) Mission Archive (7.2 arcsec search radius) -- NGC 3998GALEX Mission Data Archive at MAST
    Explore IRSA resources with RADAR (10 arcsec search radius) -- NGC 3998NASA/IPAC Infrared Science Archive (IRSA)
    Resources for position 11h57m56.1s, +55d27m13s (J2000)Site/Service
    Query Optical and UV Mission Archives (Default search radius)Multimission Archive at STScI (MAST)
    Query High Energy Mission Archives (Default search radius)HEASARC (NASA/GSFC)
    SDSS Sky Server
    Query IRSA for WISE images (10 arcmin search radius)NASA/IPAC Infrared Science Archive (IRSA)
    Band(s): Size:
    NASA/IPAC Infrared Science Archive (IRSA)
    Band(s): Size:
    NASA/IPAC Infrared Science Archive (IRSA)
    NASA/IPAC Infrared Science Archive (IRSA)
     Size:    Contours (PS)  JPEG  FITS File 
    NRAO/VLA Sky Survey (NVSS)
        Size:     GIF     FITS File  
    Faint Images of the Radio Sky at Twenty-Centimeters
    The NRAO Data Archive System

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