J0328-1219 Photometry Observations by
Amateur Bruce Gary (16" Ritchey-Chretien)
Bruce L. Gary, Last updated:
This web page is meant to be an archive of
my light curve observations of white dwarf J0328 using the
Hereford Arizona Observatory (HAO) backyard observatory (link).
the similarities and some differences between December and
January. Some dust clouds are in slightly different orbits
compared to other dust clouds (based on their different phase movements).
This is similar to what happens at WD1145.
Figure 1. Combining all 6 LCs for
and 5 LCs for January show 10 dips in both data sets plus one
dip in only the December data (Dip 11).
RA/DE = 03:28:33.5 -12:19:45, r'-mag ~
16.6, white dwarf type DZ, T_eff = 8750 (170) K (Guidry et
List of Internal Links
Observing Session Dates
Data Exchange File for all data: link
Session Light Curves
Note: Differences at the same phase between dates will
exist if a B-system of dips is present.
Clouds ended the observing session
model AHS trace is based on fitting data from all 4
observing sessions to date (cf. Fig. 1).
Windy after 5 UT.
Finder image. FOV = 15 x 10 'arc. North up, east left.
Here's a periodogram of my December and
January data using Peranso:
It would appear that J0328 brightness
varies with a periodicity of 9.943 hours based on my HAO
observations for December and January. However,
it is possible that components exist for P = 9.85, 9.94 and 10.05
other words, the three peaks in this periodogram suggest that
there are three rings of dust cloud debris that transit.
My Collaboration Policy
Please don't ask me to co-author a paper! At my age of 81 I'm
entitled to have fun and avoid work. Observing and figuring
things out is fun; writing papers is work. My observations are
"in the public domain" and are available for use by anyone. If
my data is essential to any publication just mention this in
the Acknowledgement section.
Xu, Siyi, Samuel Lai and Erik Dennihy, 2020, "Infrared Excesses
around Bright White Dwarfs from Gaia and unWISE I," arXiv
A. Guidry, Zachary
P. Vanderbosch, J.
J. Hermes, Brad
N. Barlow, Isaac
D. Lopez, Thomas
M. Boudreaux, Kyle
A. Corcoran, Bart
H. Dunlap, Keaton
J. Bell, M.
H. Montgomery, Tyler
M. Heintz, D.
E. Winget, Karen
I. Winget, J.
W. Kuehne, 2020, "I Spy Transits and Pulsations: Empirical
Variability in White Dwarfs Using Gaia and the Zwicky Transient
Facility," submitted to ApJ, arXiv
External Links of
WD1145 summary of 4
WD1145 for 2020/21
Resume of webmaster
This site opened: 2020.12.04.