RWG on 03-Feb-2011 21:33:31 GMT about
The coords of Ross 4 = NSV 1436 given by Simbad:
J2000 04 02 38 +42 50.6
are inaccurate and should be corrected to:
J2000 04 02 39.02 +42 50 46.0
See:
<http://www2.hawaii.edu/~bedient/svr004.html (http://www2.hawaii.edu/~bedient/svr004.html)>
<http://www2.hawaii.edu/~bedient/1202.jpg (http://www2.hawaii.edu/~bedient/1202.jpg)>
Jim Bedient did an astrometric reduction of the best of 6 images taken by Karen J. Meech with the University of Hawai'i 2.2m telescope at Mauna Kea. The precise positon of NSV1436 is (J2000) RA 04h 02m 39.024 ±0.18s +42° 50' 46.02 ±0.21" (reflected at the top of this page).
This is confirmed by the coords in the GCVS
<[NSV 1436 in VizieR (http://vizier.u-strasbg.fr/viz-bin/VizieR-S?NSV%201436)> that gives:
J2000 04 02 39.0 +42 50 44
and in VSX:
<oid=40060 (http://www.aavso.org/vsx/index.php?view=detail.top&oid=40060)>
that currently gives:
J2000 04 02 38.97 +42 50 44.4
And position:
J2000 04 02 39.02 +42 50 45.4
in:
----- Original Message -----
From: "Arne Henden" <arne@aavso.org>
To: <cvnet-discussion@yahoogroups.com>
Cc: "AAVSO-DIS" <aavso-discussion@aavso.org>
Sent: Sunday, January 02, 2011 1:54 PM
Subject: Re: [AAVSO-DIS] [cvnet-discussion] Correct position of NSV 1436?
>
> On 1/2/11 4:37 AM, Eddy Muyllaert wrote:
>> Hi all,
>>
>> About NSV 1436, what should be the correct position?
>> Aladin and the AAVSO give different location. See enclosed charts.
>
> Bruce Sumner and I researched this issue many years ago when I was at USNO. The
> sequence file he created is at:
> ftp://ftp.aavso.org/public/calib/sumner/nsv1436.seq
and <http://joevp.20m.com/charts/henden/Her%20to%20Vul/NSV_1436.txt (http://joevp.20m.com/charts/henden/Her%20to%20Vul/NSV_1436.txt)>
> In there, he states:
> Position: 04 02 39.02 +42 50 45.4 (J2000, from .dat file)
>
> "3. The variable is one of the components of a close double star, but it
> has not been determined which is the actual variable. The two components
> have the following single night photometry:
>
> Comp 1: V=15.846 B-V=0.460
> Comp 2: V=17.196 B-V=0.672
>
> I have tentatively identified the bright northern component, located
> 5 arcsec north of the fainter component, as the variable."
>
> I don't know of any more definitive identification.
> Arne
And:
----- Original Message -----
From: "Denis Denisenko" <denis@hea.iki.rssi.ru>
To: <cvnet-discussion@yahoogroups.com>
Cc: "AAVSO-DIS" <aavso-discussion@aavso.org>
Sent: Wednesday, January 12, 2011 5:05 PM
Subject: Re: [AAVSO-DIS] [cvnet-discussion] Correct position of NSV 1436?
>
> Hello all!
>
> Eddy brought up an interesting identity case to which Arne Henden has
> replied.
>
> I can confirm that the Northern component is variable indeed. Compare
> the three Palomar Infrared plates taken on three different nights in
> 1990, 1994, 1995:
> http://hea.iki.rssi.ru/~denis/NSV1436-DSS-IR.gif (http://hea.iki.rssi.ru/~denis/NSV1436-DSS-IR.gif) (75"x75" FOV at 4x zoom)
>
> On the first plate the northern component (N comp) is fainter than the
> southern one, while it is brighter on the other two. Actually, out of
> 12 DSS plates the N comp is brighter on 10, including the Blue POSS-I O
> plate of 1953, while S comp is brighter on photovisual 1983 plate and
> 1990 IR plate mentioned above.
>
> Also, the variable star possesses an apparent proper motion (about 1" in
> 40 years), as can be seen from the comparison of 1st and 2nd epoch
> Palomar Blue plates taken in 1953 and 1993:
>
> http://hea.iki.rssi.ru/~denis/NSV1436-DSS-B.gif (http://hea.iki.rssi.ru/~denis/NSV1436-DSS-B.gif)> (75"x75" FOV at 4x zoom)
>
> Rather large ROSAT X-ray flux (0.136 cnts/s) and hardness ratios
> (HR1=0.92+/-0.05, HR2=0.31+-/0.12) together with proper motion and blue
> color make it definitely a Dwarf Nova. Unfortunately, I have missed it
> in my searches of ROSAT variables since this object has source extent of
> 19" while I was looking for the variables only among point sources.
>
> More information about this star can be found at the following pages:
>
> http://www2.hawaii.edu/~bedient/svr004.html by J. Bedient (2004) with a
> note from B. Skiff (2003)
> http://www.aavso.org/sites/default/files/jaavso/ej128.pdf (http://www.aavso.org/sites/default/files/jaavso/ej128.pdf)> (S. Brown et
> al., JAAVSO Vol. 38, 2010)
>
> The star appears to be very interesting due to its rare outbursts (only
> two were detected so far, in 1904 and 1948!) and large long-term
> variability at quiescence.
>
> Denis
>
> P.S. I have checked if the 1904 Nov. 1 outburst from the original Ross
> paper could have been a bright minor planet instead, but 11-mag (13)
> Egeria and 12-mag (78) Diana were too far from the star's position,
> though in Perseus-Auriga region quite far from ecliptic.
CS
Wolfgang
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