Credit/Permission: For text, © David Jeffery. For figures etc., as specified with the figure etc. / Only for reading and use by the instructors and students of the UNLV astronomy laboratory course.
What is the angular separation of
Castor and
Pollux in
fists? Explain how you got your answer.
Sub Tasks:
RMI qualification:
If you do NOT have access to a
printer, you will have to
hand-draw the sky map.
You will have to do a conversion from local time to
Universal Time (UT)
to update the time.
How to do the conversion is explicated in the figure below
(local link /
general link: sky_map_current_time_las_vegas.html).
NOT all the double stars
in the Observing Working Table for Double Stars
are labeled on the printed-out sky map.
You will have to click on the names of the unlabeled ones
(on the printed-out sky map)
in Observing Working Table for Double Stars to get a
sky map with them located.
Label the unlabeled double stars
on your printed-out sky map.
RMI qualification: Whether
you report your sky map in any way depends on
the instructions for your particular
semester of the
Remote Instruction Course.
Sub Tasks:
Generally, you go down the list in order since the
generally the double stars get
harder to resolve going down the list, and so you gain experience as you go.
However, if a double star
is getting close to the
horizon or being threatened
to be clouded-out, you may have to observe it early.
Double stars
that may need to be observed early are marked with OE for "observe early".
Of course, if you can locate the
double star by eye using your
sky map,
you can just slew the
C8
to the vicinity of the double star
without using the LCD keypad location tool.
All the double stars
in the Observing Working Table for Double Stars
are bright enough to be seen with the
naked eye even in
Las Vegas though some barely.
You could ask your
instructor if you are doubtful.
Add a comment if needed: e.g., clouded-out, too close the
horizon,
the secondary star
in the double star too faint
to be seen compared to the primay star,
awesome.
Sub Tasks:
Sub Tasks:
Sub Tasks:
Sub Tasks:
Modifications to the sub tasks in
General Task: Naked-Eye Observations below:
However, you should be able to find
in the winter and
spring
not-too-late night sky
Castor (α GEM)
and
Pollux (β GEM)
which are "twin" stars even though
NOT collectively a
double star in the usual meaning.
Their angular separation is 4°30'19.53'' at some epoch, maybe the
J2000 epoch
(see Distance between Pollux and Castor?).
This angular separation is about half a
fist at
arm's length.
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Table: Parameters to Equal/Surpass the Seeing Limit
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Seeing θ_S D_in = 5''/θ_RV D_in = 5''/θ_RV M = 60''/θ_HT M = 60''/θ_HT
(θ_RV=θ_S) (θ_RV=θ_S/3) (θ_HT=θ_S) (θ_HT=θ_S/3)
('') (in) (in) (X) (X)
_________________________________________________________________________________
Poor 10
LV Strip 4
Good 1
Excellent 0.4
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