[vsnet-obs 21070] SN 1999cl and 1999cf (Howerton)

[Taichi Kato <tkato>]

From hwcomdso@horizon.hit.net Tue Jun  8 06:24 JST 1999
From: "Stan Howerton" <hwcomdso@horizon.hit.net>
To: "Taichi Kato" <tkato@kusastro.kyoto-u.ac.jp>
Subject: SN 1999cl and SN 1999cf
Date: Mon, 7 Jun 1999 16:25:09 -0500
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The following visual estimates were made with a 17.5" (44.5 cm) f/4.1
dobsonian telescope.  The limiting magnitude was 16.5 at 380x.

SN 1999cl in Messier 88

June 5    4:15 UT    14.3
June 7    4:15 UT    14.2


SN 1999cf in UGC 8539

June 7    5:20 UT    15.8

While I am confident of the estimates for SN 1999cl, I am not so for the
estimate for SN 1999cf.  I am uncertain as to the reliability of the
magnitudes on the VSNET chart for visual sightings.  The two stars to the
east-northeast of UGC 8539 were only slightly difficult with averted vision,
yet the chart lists their magnitudes as 16.66 and 17.34.  I thought both
were brighter than a magnitude 16.3 star I recalled in the M88 field. The
supernova was definitely brighter than either star.

Stan Howerton
hwcomdso@horizon.hit.net

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