[vsnet-obs 38390] V838 Mon and SN 2002ap (GRL, Feb. 13)

["Bjorn H. Granslo" <b.h.granslo@astro.uio.no>]

Norwegian Astronomical Society - Variable Star Section

Observations of V838 Monocerotis and SN 2002ap

Observations from 2002 February 13 UT.
Observer: Bjorn H. Granslo (GRL).
Location: Fjellhamar & Oslo, Norway.
Instruments: 25.4-cm reflector (M254), 7.0-cm refractor (L70).
Magnitude references: NAS.VSS (V mag. from various sources).
Observations: Visual, Pogson step estimates.
Conditions: Partly cloudy to clear.

Object      YYYYMMDD(UT)   Mag  Obs  Instrument Ref.    Notes
MONV838     20020213.031   7.9  GRL  L70;24x    NAS     Low
MONV838     20020213.758   8.1  GRL  L70;24x    NAS     Fading
SN2002ap    20020213.844  12.8  GRL  M254;163x  NAS     Fading

Observation of V838 Mon from Feb. 13.031 UT: G-4;J+2 (class 2).
Observation of V838 Mon from Feb. 13.758 UT: H-3;J=V (class 1).
Comparison stars (NAS.VSS sequence with V magnitudes derived from
UBV and Tycho-2 catalogues): G = 7.47, H = 7.75, J = 8.17.
NAS.VSS chart (prepared by B. Andresen):
http://vsnet.nvg.org/org/taf/artsam/varstj/kart/V838_Mon_a.jpg .

Observation of SN 2002ap from Feb. 13.844 UT: E-4;H+2 (class 2).
[Hypernova was only barely visible due to bright sky and low
elevation.] Comparison stars (NAS.VSS sequence with V magnitudes):
E = 12.4 (GSC 1205-0616), H = 13.04 (GSC 1205-0789). Chart at:
http://vsnet.nvg.org/org/taf/artsam/varstj/kart/SN2002ap_c.gif

                             Yours sincerely,
                             Bjorn H. Granslo

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