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[vsnet-obs 10374] NAS.VSS report no. 1 on SN 1998S (1998 Mar. 11)

Norwegian Astronomical Society - Variable Star Section

OBSERVATIONS OF SUPERNOVA 1998S IN NGC 3877 - NAS.VSS REPORT NO. 2
==================================================================

Supernova 1998S: R.A. = 11h46m06s.0, Decl. = +47o28'55"  (J2000.0)
 [Type IIn]   (Offset from nucleus of parent galaxy: 14" W, 46" S)

-------------------------------------------------------------------
YYYY MM DD.DDD  OBSERVATIONS   MAG  CL  INSTRUM.    OBSERVER
-------------------------------------------------------------------
1998 03 10.017    x+2;y+5     12.2  2   C203;200x   Granslo, B. H.
1998 03 10.098  x+2;y+3;A+3   12.3  2   C203;200x   Granslo, B. H.
1998 03 11.044  6-3;x+3;A+3   12.2  2   C203;287x   Granslo, B. H.
1998 03 14.019  6-2;x+6;A+6   12.0  2   C203;287x  *Granslo, B. H.
1998 03 17.022  6-1;8+3;A+5   12.0  2   C203;287x  *Granslo, B. H.
1998 03 18.021  6-1;8+3;A+6   11.9  2   C203;287x  *Granslo, B. H.
-------------------------------------------------------------------

Time system is year, number of month and date with decimals in U.T.
Observations are Pogson step estimates. Magnitudes are derived from
these estimates by using the sequence below. CL = class: estimated
accuracy of observation; 1 = good (+/- 0.1 mag.), 2 = fair (+/- 0.2
mag.), 3 = poor (+/- 0.3 mag. or more). Instrument (type, aperture
in mm and magnification): C = catadioptric telescope (SCT). New
entries since report no. 1 are identified by an asterisk (*).

Observers: Bjorn H. Granslo (Fjellhamar, Norway).

Comparison stars:
-----------------------------------------------------------------
Ident.  Star Name     R.A. (2000.0) Decl.  V-mag. Ref. Notes
-----------------------------------------------------------------
                     h  m   s    o  '  "
  5   TIC 3452-1079  11 47 39.9 +47 32 41  11.2 :  TI  (b-r)=+0.5
  6   TIC 3452-1149  11 45 44.9 +47 47 42  11.8    TI
  7   GSC 3452-0905  11 47 09.0 +47 23 34  11.9 :  G1
  8   GSC 3452-1238  11 45 26.8 +47 48 32  12.2 :  G2  (b-r)=+0.7
  x   GSC 3452-1101  11 45 35.6 +47 33 12  12.5 :  G2  (b-r)=+1.1
  y   GSC 3452-1061  11 46 29.2 +47 31 09  12.6 :  G2  (b-r)=+0.2
  A   GSC 3452-1170  11 46 20.1 +47 35 32  12.6 :  G2  (b-r)=-0.3
  B   GSC 3452-1091  11 45 41.5 +47 32 47  13.2 :  G2  (b-r)=+0.6
-----------------------------------------------------------------

Identifications are from TA E-Circular 1278 (capital letters) and
NAS.VSS (others). V-magnitudes followed by a colon (:) are
uncertain. References to positions and magnitudes are TI = Tycho
Input Catalogue, G1 = Guide Star Catalogue, Ver. 1.1 [GSC] (single
entry), and G2 = GSC (mean of two entries). The colour indices
(b-r) are based on the PPM USNO-A1.0 catalogue.   (BHG/1998/03/18)

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