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VizieR

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VII/112/catalog RC2 Catalogue (de Vaucouleurs+ 1976)
The RC2 catalogue (4364 rows)
  recno=130
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ColumnValue  Explain   (UCD)
_RAJ200000 42 42.28 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEJ2000+40 51 55.8 "d:m:s" Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_RAB195000 39 58.20 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEB1950+40 35 30.0 "d:m:s" Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_Glon121.15157 deg Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon)
_Glat-21.97606 deg Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat)
130recno 130  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

NameNGC 221  RC2 identification (NGC, IC, or anonymous) (meta.id;meta.main)
m_Name   Component identification (A, B, C, etc.) (Note 1)   (meta.code.multip)
RA195000 39 58 "h:m:s" (i) Hours RA, 1950.0 (pos.eq.ra;meta.main)
DE1950+40 35.5 "d:m:s" (i) Degrees Dec, 1950.0 (pos.eq.dec;meta.main)
GLON121.16 deg Galactic longitude (pos.galactic.lon)
SGLON335.8 deg Supergalactic longitude (pos.supergalactic.lon)
MTypeCE.2...  Revised morphological Type (Table 2) (Note 9)   (src.morph.type)
Hubble-6  Numerical Hubble Sequence Index T (Table 3) (Note 9)   (meta.code;spect.index;obs.sequence)
n_Hubble    [*RP$] Remark on Hubble Sequence Index (Note 8)   (meta.note)
Plate....  Source of plate (Table 4) (Note 9)   (meta.ref;pos.frame;instr.plate)
r_MTypeV  Morphological type author code (Table 5) (Note 9)   (meta.note)
Yerkes_1E3 K  Yerkes list 1 type and color classes (Note 6)   (meta.note;phot.color)
Byurkan4   [1/5] Nuclear type in Byurkan system (Note 2)   (meta.note)
n_Byurkan    [*$S2-5] Note on Byurkan nucleus type (Note 2)   (meta.note)
logD25 1.88 [0.1arcmin] Major isophotal diameter, log(D_25) (phys.angSize)
logR25 0.12   Ratio major to minor diameter, log(R_25) (phys.angSize;arith.ratio)
logD(0)25 1.86 [0.1arcmin] Face-on major isophotal diameter (phys.angSize)
logAe 1.04 [0.1arcmin] Effective aperture diameter, log(Ae) (phys.angSize;instr.fov)
u_logAe$   [*$] '*'=uncertain, '$'=doubtful (meta.code.error)
ID   Object identifications (Note 9)   (meta.id)
precRAm 5.51 0.01min/yr Centennial precession in RA, minutes (pos.precess;pos.eq.ra)
precDEm 32.7 0.01arcmin/yrCentennial precession in DE, arcminutes (pos.precess;pos.eq.dec)
GLAT-21.98 deg Galactic latitude (pos.galactic.lat)
SGLAT 12.5 deg Supergalactic latitude (pos.supergalactic.lat)
DDOTypeE 2  David Dunlap Obs. (van den Bergh) type (Note 7)   (meta.note)
DDOClass    David Dunlap Obs. luminosity class (Note 7)   (src.class.luminosity)
u_DDOClass    [*$] '*'=uncertain, '$'=doubtful (meta.code.error)
Weight 5.0   ]0/5] Plate material weight (Note 9)   (stat.weight;phys.atmol.weight;instr.plate)
Yerkes_2E3 K  Yerkes list 2 type and nuclear class (Note 6)   (src.morph.type)
RC1   RC1 nuclear class (Note 9)   (meta.code.class)
e_logD25 0.040 [0.1arcmin] Mean error of logD25 (stat.error)
e_logR25 0.026   Mean error of logR25 (stat.error)
D0 1.92 [0.1arcmin] Corrected log(D(0)25) for galactic extinc. (arith.zp)
e_logAe 0.03 [0.1arcmin] Mean error of log(Ae) (stat.error)
Hmag 9.5 mag Harvard photographic magnitude, mH (phot.mag;em.opt)
u_Hmag    [*] if Hmag uncertain (meta.code.error)
BT 9.15 mag Total asymptotic B magnitude (BT) (phot.mag;em.opt.B)
n_BT    [*S] Flag on BT, see note (Note 3)   (meta.note)
SuBr 9.8 mag/arcsec2 Mean B surface brightness within Ae (Note 9)   (phot.mag.sb;em.opt.B)
Extinct 0.40 mag Galactic extinction in B system (A_B) (Note 9)   (phys.absorption.gal)
(B-V)T 0.94 mag Asymptotic color index (Note 9)   (phot.color;em.opt.B;em.opt.V)
n_(B-V)T    [*] Flag on (B-V)T, see comment (Note 3)   (meta.note)
(U-B)T 0.47 mag Asymptotic color index (Note 9)   (phot.color;em.opt.U;em.opt.B)
n_(U-B)T    [*] Flag on (U-B)T, see comment (Note 3)   (meta.note)
(B-V)Ae 0.94 mag Effective aperture color index (Note 9)   (phot.color;em.opt.B;em.opt.V)
n_(B-V)Ae    [*] Flag on (B-V)Ae, see comment (Note 3)   (meta.note)
(U-B)Ae 0.50 mag Effective aperture color index (Note 9)   (phot.color;em.opt.U;em.opt.B)
n_(U-B)Ae    [*] Flag on (U-B)Ae, see comment (Note 3)   (meta.note)
B-V 0.85 mag Total B-V color index, corrected (Note 9)   (phot.color;em.opt.B;em.opt.V)
logS_R  [10mJy] Radio continuum flux near 1.4GHz (21cm) (phot.flux.density;em.radio.750-1500MHz)
n_logS_R    [$+*] Conditional code for logS_R (Note 4)   (meta.note)
SpIndex1    Spectral index, α- for ν < ν_R (spect.index)
u_SpIndex1    [$*] '*'=uncertain, '$'=very uncertain (meta.code.error)
logS_H  [10-22W/m2] Integrated HI flux density (phot.flux.density;em.line.HI)
n_logS_H*   [$+*] Conditional code for logS_H (Note 4)   (meta.note)
RIndex  mag Corrected radio index (RI) (Note 9)   (spect.index;em.radio)
u_RIndex    [$] '$' for doubtful RIndex value (meta.code.error)
RadVel -217 km/s Observed Radial velocity (cz) (spect.dopplerVeloc)
u_RadVel    [*] '*' if discrepant RadVel values (meta.code.error)
RadVel0 21 km/s Radial velocity corrected for solar motion (spect.dopplerVeloc)
AppendixPT   [PST ] Appendices codes, see comment (Note 5)   (meta.ref;pos.frame)
Zwicky   Zwicky identifications (meta.id)
HmagCorr 9.12 mag Corrected Harvard photog. magnitude (Note 9)   (phot.mag;em.opt.B)
e_BT 0.10 mag Estimated mean error of BT (Note 9)   (stat.error;phot.mag;em.opt.B)
SuBrAv13.2 mag/arcsec2 Average surface brightness (Note 9)   (phot.mag.sb)
BT0 8.75 mag Corrected face-on magnitude (Note 9)   (phot.mag;em.opt.B)
e_(B-V)T 0.02 mag Mean error of asymptotic color (Note 9)   (stat.error)
e_(U-B)T 0.02 mag Mean error of asymptotic color (Note 9)   (stat.error)
e_(B-V)Ae 0.01 mag Mean error of effective color (Note 9)   (stat.error)
e_(U-B)Ae 0.01 mag Mean error of effective color (Note 9)   (stat.error)
(U-B)T0 0.38   Total corrected U-B color index (Note 9)   (phot.color;em.opt.U;em.opt.B)
o_SpIndex1    Number of radio continuum measurements (meta.number)
o_logS_R    Number of radio measurements for logS_R (meta.number)
o_SpIndex2    Number of radio continuum measurements (meta.number)
SpIndex2    Spectral index, α+ for ν > ν_R (spect.index)
u_SpIndex2    [$*] '*'=uncertain, '$'=very uncertain (meta.code.error)
o_logS_H    Number of 21cm emission line observations (meta.number)
A21  mag Self-absorption at 21 cm (1.4GHz) (phot.mag;em.radio.750-1500MHz)
HI  mag Neutral hydrogen index (Note 9)   (phot.color)
u_HI    [$] '$' if HI is doubtful (meta.code.error)
o_RadVelR0   Number of radio observations for RadVel (meta.number)
o_RadVelO 3   Number of optical observations for RadVel (meta.number)
e_RadVel 9 km/s Radial velocity mean error (stat.error)
DVelSun 238 km/s Solar motion correction, delta V (arith.factor;phys.veloc;pos.cartesian.y)

_RA.icrs00 42 42 "h:m:s" (i) Right ascension (ICRS) (computed by VizieR, not part of the original data) (pos.eq.ra)
_DE.icrs+40 51.9 "d:m:s" (i) Declination (ICRS) (computed by VizieR, not part of the original data) (pos.eq.dec)
  
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