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[vsnet-alert 311] revised ephemeris for V348 Pup (=1H0709-36)
- Date: Wed, 10 Jan 1996 23:06:45 GMT
- To: tmca@cfht.hawaii.edu, jab@aaoepp2.aao.GOV.AU, hbarwig@usm.uni-muenchen.de, szkody@phys.washington.edu, shafter@proteus.sdsu.edu, wade@astro.psu.edu, haswell@carmen.phys.columbia.edu, rwh@st-andrews.ac.uk, trm@phastr.soton.ac.uk, rgmr@lpve.ing.iac.es, vsd@lpve.ing.iac.es, erho@astro.as.utexas.edu, elr@astro.as.utexas.edu, garcia@cfa200.harvard.edu, rr@space.mit.edu, jmcclintock@cfa210.harvard.edu, eracleous@stsci.edu, silber@calypso.astro.washington.edu, honey%iubacs.BITNET@earn-relay.ac.uk, kdh1@st-and.ac.uk, chico@lna.br, elizalde@das.inpe.br, wfw@astro.keele.ac.uk, vsnet-alert@kusastro.kyoto-u.ac.jp
- From: "Raymundo Baptista" <rb8@st-andrews.ac.uk>
- Subject: [vsnet-alert 311] revised ephemeris for V348 Pup (=1H0709-36)
- Cc: rb8@st-andrews.ac.uk
- Sender: owner-vsnet-alert@kusastro.kyoto-u.ac.jp
Dear CV-observers,
The eclipsing cataclysmic variable V348 Pup (= 1H0709-36) will be the
subject of an HST cycle 6 program, aiming to perform multiwavelength
eclipse mapping. A good/reliable ephemeris of eclipse minimum is
crucial in order to properly center the eclipses in the narrow HST
observing windows (some 40-mins). My last observations of this target,
back in 1992, indicate that the former ephemeris was in error by some
30-mins at that time (and certainly more by now!).
I would appreciate to have your help in trying to obtain a revised
ephemeris for this target (it is hardly observable from the northern
hemisphere). The coordinates of V348 Pup are (J2000),
RA: 07 12 32.9 DEC: -36 05 40.4
A good finding chart can be found in the Catalog and Atlas of CVs by
Downes and Shara (1993, PASP 105, 127). V348 Pup has magnitude V~15
outside of eclipse but goes down to V~17 at mid-eclipse time. The
target is well positioned in the (southern) sky at this epoch of the
year, so observations could be done at pretty any time during a night
(by a properly positioned observer). Some 3-5 eclipse timings would
be enough to derive an updated ephemeris by joining them with the
previously published ones.
Due to error propagation, my estimate is that the actual eclipses
are happening some 50-mins *before* the times predicted by the ephemeris
of Tuohy et al. (1990). The following provisional ephemeris may be used
to estimate times of mid-eclipse,
Tmid= HJD 2447210.12091 + 0.1018389075 E.
If you are able or intend to obtain some observations for this purpose
please let me know. Of course, those who obtain useful ground-based
data will be included as co-authors in the appropriate papers on the
HST observations.
My best regards,
Raymundo Baptista
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