Posts by hank

by hank
20.10.2007, 06:00
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

OK I checked the starnames.dat file. Indeed that's the names that Celestia uses (MU2, BET2, BET1,...), which are not conform, however, with the encouraged SIMBAD identifiers. However, I found out that SIMBAD does accept MU2 Boo etc. Hence we should continue with that previous notation. I see that S...
by hank
19.10.2007, 23:01
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

The Bayer designations for these stars haven't changed since the work of Argelander (Heis?) in the nineteenth century. I don't know what you want to say with this remark. If you look into SIMBAD you see that MU1 & MU2 Boo are meanwhile running under a multitude of names. The question is which o...
by hank
19.10.2007, 21:32
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

Obviously, a cross index needs the HR = Bright Star numbers and these necessarily invoke the corresponding catalog, i.e. the Yale Bright stars... But this is just for historical completeness. It's mainly the HIP, Tycho and HD catalogues who are these days taken as references. Fridger, The Bayer des...
by hank
19.10.2007, 20:10
Forum: Celestia Users
Topic: Demonstrating moon's phases
Replies: 3
Views: 2176

Re: Demonstrating moon's phases

Position the camera between the Earth and Moon. Select the Moon and press ":" to lock the camera on the Earth-Moon line. Press "T" to keep the Moon centered. Well, I tried that, but it didn't work. Then, while tinkering, I noticed something... at the bottom right corner of the window, it said "Lock...
by hank
19.10.2007, 19:34
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

Exactly 20 years ago... It is superseded since a long time. It's just the brightness range covered that comes handy for amateurs. It's not the kind of catalog that these days sets standards including names! John Bahcall died August 2005... Bye Fridger The 5th Revised Edition of the Yale Bright Star...
by hank
19.10.2007, 18:09
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

While the Yale Bright Star catalog is well known among astro amateurs, it is not really a professional level up-to-date star catalog. I believe the Yale Bright Star Catalog is also known to and used by professional astronomers and astrophysicists, e.g. Bahcall, Casertano and Ratnatunga (1987), An a...
by hank
19.10.2007, 16:27
Forum: Celestia Users
Topic: Demonstrating moon's phases
Replies: 3
Views: 2176

Re: Demonstrating moon's phases

I want to be able to show a demo to my class on the phases of the Moon, and I need to be able to show the position of Earth, Moon and Sun, as well as an image of the moon as it would look from Earth. I've successfully divided up the window into panes showing everything I want, but the problem is th...
by hank
19.10.2007, 16:06
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

What do you mean with your "Shouldn't it be" remark? I was of course quoting a main official nomenclature for these binary systems from the professional SIMBAD database : MU.01 Boo MU.02 Boo Your MU1 and MU2 proposal is not found in any official database AFAIK. So are you proposing that I use a "ho...
by hank
19.10.2007, 14:41
Forum: Add-on development
Topic: Sun's Life
Replies: 17
Views: 8239

Re: Sun's Life

Providing that the collision does not eject a substantial part of the mass away, there should be enough mass to create a black hole. It also should be noted that the collision has to be with like objects (either 2 dwarf stars with between 2-3 solar masses or two white dwarfs with 1.4 solar masses c...
by hank
19.10.2007, 14:29
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

In SIMBAD HIP 75411 -> MU.01.Boo HIP 75415 -> MU.02.Boo AHA! ;-) (see my longstanding relation to the mu Boo system below) Tonight, before committing the final file versions, I shall straighten the name syntax a bit. Right now there is a left-over . after the MU It should perhaps be MU. -> MU.01 an...
by hank
18.10.2007, 15:50
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

But Hank, seems you have miss the root of the problem which is: How do you chose a source or another? The only way to eliminate the doubloons would be to change the sources, and for this you should be able to contest the calculations made by the original author... (Now if you want to do the job... ...
by hank
18.10.2007, 14:50
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

I previously eliminated already some doublets from the catalogs, also in a rather arbitrary manner. To offer the two ~ complete catalogs is now possible due to this addition of (vis) and (spc), respectively. This seems kind of attractive. What do you think? It's easy to get these former stars back ...
by hank
18.10.2007, 00:34
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

Following Fridger's suggestion, it may be interesting to actually use all of these stars, even the doubles, but uniformizing their names, and adding "(spectroscopic)" and "(visual)". Something like this : "Chi Dra (visual)" "Chi Dra (spectroscopic)" "HIP1115...
by hank
17.10.2007, 23:49
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

OK Hank, then could you please "re"-interpret these statements of yours: Gladly. If it can't be completed in time, would it be better to leave the binary orbits out of 1.5.0 entirely? That was mainly a rhetorical question. I thought the answer would be obvious. The only reason I could think of why ...
by hank
17.10.2007, 22:39
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

Sorry, but we established certain scientific standards in Celestia that are NOT up to you to modify or decide about. So the official distribution is to provide the public with a data base that is up to high scientific standards. That's the target whether you like it or not. In fact I'm strongly in ...
by hank
17.10.2007, 20:20
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

In most cases, the users are NOT qualified to decide this! Also many users would not be able to run PERL from the datasets, because of lack of experience. I think users are qualified to decide what their needs are, and that we should make it easy for them to adapt Celestia to their own needs. Why? ...
by hank
17.10.2007, 19:31
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

But why this hurry? When the release date seems to get closer, I will take some of my time, do the mods and commit the changes to CVS. It's as simple as that. Right now I am just doing other things. Why isn't that easy to understand? We're coming up on two years since the last release of Celestia. ...
by hank
17.10.2007, 18:01
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

I could just add a few PERL statements rerun the scripts and the doubles would be gone. That's so trivial, not worth loosing even one sentence. If a trivial change to the PERL scripts could segregate the duplicates into separate files, then the user could choose which file(s) of duplicates to load ...
by hank
17.10.2007, 17:20
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

But also we have to agree about the final Greek letter naming of some of the stars etc. It's just work that is straightforward for me but for the time being it has NOT top priority. Sorry Fridger, I missed that part of your previous post. So there is more work to be done. Is this task on the list f...
by hank
17.10.2007, 17:08
Forum: Ideas & News
Topic: stars.txt
Replies: 266
Views: 106638

Re: stars.txt

Presumably PERL could be used to segregate the duplicate data. Of course. That's what I did already earlier. See above. I must have misunderstood. If the duplicates are already segregated from the non-duplicates, then isn't the only question which of the files of duplicates to load by default? - Hank

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