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Old 08-21-2018, 09:16 PM   #11
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Default Re: Stellar Mapping

Quote:
Originally Posted by Agemegos View Post
If you are adding objects manually, start with the Extended Hipparcos dataset XHIP.



There is a sidebar on the left with an "preferences" box in it that ought to let you do useful things like set the number of results returned, sort the returns, specify format etc. You can also get it to calculate some values for you, but sadly not spectral type.



Special-purpose astronomical catalogues can be startlingly single-minded. That's what makes XHIP so lovely.
Wow. You rock.

I had to muck with my browser's settings to see that left-hand column stuff. It is exactly what I was missing for at least one of my problems.

Quote:
Originally Posted by Agemegos View Post
To amplify on a previous answer, I recommend that you start with the Extended Hipparcos compilation. Published in 2012, it consists of quality controlled position data from Hipparcos that has been carefully compiled with basically all the other data available in other catalogues.

XHIP has spectral classes and luminosities associated with Hipparcos position data. Also distance pre-calculated. Cartesian co-ordinates pre-calculated. Stellar ages where known. Metallicity where known. Star names. What constellation the star is in.

It also has a huge trove of stuff that you aren't interested in right now. Proper motions. Radial velocities. Space velocities in Cartesian co-ordinates. Elements of the star's orbit around the centre of the Galaxy. Number of known exoplanets. Type and range of variability.

I don't know why you might be having trouble, but if I navigate to http://vizier.u-strasbg.fr/viz-bin/V...e=+V/137B/XHIP I can go to the "Preferences" pane in the column on the left, click on the drop-down menu next to "max:" where it says "50" and select "unlimited". Then in the drop-down menu where it says "HTML table" I click and select "tab-separated variables" or whatever. And under "Position in:" I click the radio button for "decimal". Then I go to the main body of the text and check the data I want included in my report in the square check-boxes. Distance is "Dist" in the second group of data. I click the round "sort" radio button to get the output sorted in distance from Sol. And in the "constraint" column next to "Dist" I put "0..13.3" to get only results within 13.3 pc (43.36 LY). Then click any of the "submit" buttons and the results are downloaded to my Downloads folder as a tab-separated-variables file called "asu.tsv".

It works for me, but the results are too much to include in a post here. I put a results file on DropBox in case that is useful.

I think you are going to have to add new discoveries since 2012 by hand to something — easier than adding luminosity and spectral type to any existing positional catalogue. And given that, I think an extract from XHIP is the best catalogue to add to.
I reiterate- you rock. I'll digest this for a bit. I had searched for every variant of "Hipparcos" I could think of, but XHIP never came up... and it's a flipping AWESOME dataset.

I assume that it includes all the RECONS 100 closest stars, but I'll check them, and add all of those CTIOPI dwarfs and whatnot. I want to include all of those dwarfs because I want to set routes as short as I reasonably can in Astrosynthesis to get interesting-looking maps with strategic systems and dead-ends and such.

Thanks tons.

Hipparcos numbers lack poetry, though. Is there an easy way to find other names for stars? Zeta Tucanae, Proxima Centauri, etc.? I found a list of the 227 official IAU names indexed by hipparcos number, but I'd like the others, too.

Last edited by acrosome; 08-21-2018 at 10:12 PM.
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Old 08-21-2018, 10:58 PM   #12
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Default Re: Stellar Mapping

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Originally Posted by acrosome View Post
Hipparcos numbers lack poetry, though. Is there an easy way to find other names for stars?
Cross-reference with other sources; in general anything with an interesting name will be a bright stars, so something like wikipedia's list of nearest bright stars should do the job.
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Old 08-22-2018, 05:47 AM   #13
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Default Re: Stellar Mapping

Quote:
Originally Posted by acrosome View Post
Wow. You rock.
Thanks, but the credit really belongs to Erik Anderson and Charles Francis, who made the compilation.

Quote:
Originally Posted by acrosome View Post
Hipparcos numbers lack poetry, though. Is there an easy way to find other names for stars? Zeta Tucanae, Proxima Centauri, etc.? I found a list of the 227 official IAU names indexed by hipparcos number, but I'd like the others, too.
There are star names in XHIP. Down in the last group of data, sixth from the bottom of the page, just before "Group" and the references. Check the box, and names will be included in your output file — but they will be in one of the columns over towards the right. In that example output I put up at Dropbox the names of the objects within 13.3 pc were listed as follows:

Gliese 551 C (Proxima Cen)
Alpha Centauri (Proksima Kentavra)
Alpha Centauri (Rigel Kentaurus)
Gliese 699 (Barnard's Star)
Gliese 411 (Lalande 21185)
9 Alpha Canis Majoris (Sirius)
Gliese 729 (Ross 154)
18 Epsilon Eridani
Gliese 887 (Lacaille 9352)
Gliese 447 (Ross 128)
Gliese 725 B
61 Cygni (HR 8085)
10 Alpha Canis Minoris (Procyon)
61 Cygni B (HR 8086)
Gliese 725 A
Gliese 15 A
Epsilon Indi (HR 8387)
52 Tau Ceti
Gliese 54.1
Gliese 273 (Luyten's Star)
Gliese 191 (Kapteyn's Star)
Gliese 825 (Lacaille 8760)
Gliese 860 A
Gliese 234 A (Ross 614)
Gliese 563.2 A
Gliese 35 (Van Maanen's Star)
Gliese 628 (Wolf 1061)
Gliese 1
Gliese 687
Gliese 674

Gliese 440
Gliese 876 A (Ross 780)

Gliese 412 A (Lalande 21258)
Gliese 380
Gliese 832
Gliese 1005
40 Omicron-2 Eridani (Keid)
Gliese 682
70 p Ophiuchi (HR 6752)
Gliese 873
53 Alpha Aquilae (Altair)
Gliese 445
Gliese 526 (Wolf 498)

Gliese 251 (Wolf 294)
Gliese 205 (Wolf 1453)

Gliese 644 (Wolf 630)
Gliese 229 A
61 Sigma Draconis (Alsafi)
Gliese 570 B
Gliese 213 (Ross 47)
Gliese 693
Gliese 570 A (Lalande 27173)
Gliese 752 A (Ross 652)
Gliese 588
36 A Ophiuchi
24 Eta Cassiopeiae (Achird)
Gliese 285 (Ross 882)
Gliese 664
Gliese 908 (Lalande 46650)
Gliese 783 A (HR 7703)
82 e Eridani
Gliese 555 (Wolf 1481)
Delta Pavonis (HR 7665)
Gliese 2130 A
Gliese 2130 B
Gliese 338 A
Gliese 896 A
Gliese 784
Gliese 581 (Wolf 562)
Gliese 338 B (Lalande 18115)
Gliese 268 A (Ross 986)
Gliese 661
Gliese 625
Gliese 892 (HR 8832)
Gliese 408 (Ross 104)

Gliese 829 (Ross 775)
37 Xi Bootis (HR 5544)
Gliese 643 (Wolf 629)
Gliese 402 (Wolf 358)
Gliese 667 (HR 6426)
Gliese 880 (Ross 671)
Gliese 809
Gliese 393 (Ross 446)
Gliese 105 A
Gliese 3991
Gliese 33 (Wolf 25)
Beta Hydri
Gliese 109 (Ross 556)
107 Piscium
30 Mu Cassiopeiae (Marfak )
Gliese 879 (HR 8721)
Gliese 514 (Ross 490)
3 Alpha Lyrae (Vega)
Gliese 673 (Wolf 718)
24 Alpha Piscis Austrini (Fomalhaut)
Gliese 701
Gliese 480.1
Gliese 382
Gliese 793
Gliese 257 A
Gliese 623
44 chi Draconis (HR 6927)
1 Pi-3 Orionis (Tabit )
Gliese 686
p Eridani
Gliese 54 B
Gliese 884 (Lalande 44964)
Gliese 48 (Ross 318)
Gliese 831 (Wolf 922)
86 Mu Herculis (HR 6623)
Gliese 486 (Wolf 437)
8 Beta Canum Venaticorum (Chara)
Gliese 618 A
Gliese 745 A (Ross 730)
61 Virginis (HR 5019)
Gliese 185
Gliese 450
Zeta Tucanae

Gliese 1105
Gliese 877
54 chi Orionis
Gliese 867 A
Gliese 183
Gliese 250 A
Gliese 745 B (Ross 731)

Gliese 203 (Ross 41)
Gliese 666 A (HR 6416)
Gliese 465 (Ross 695)
Gliese 433
Gliese 4247
Gliese 785 (HR 7722)
Gliese 424
13 Gamma Leporis

Gliese 357
23 Delta Eridani (Rana)
Gliese 451 A (Lalande 22369)
Gliese 849 (Wolf 1329)
Gliese 2066
43 Beta Comae Berenices (HR 4983)
Gliese 84
96 Kappa Ceti

Gliese 3325
Gliese 442 A
Gamma Pavonis (HR 8181)
Gliese 3135
Gliese 176 (Ross 33)
Gliese 190
Gliese 3801 (Ross 1015)
Gliese 226
Gliese 358
Gliese 694
Gliese 432 A
61 Ursae Majoris
Gliese 1125
Gliese 479
Gliese 680
Gliese 239 (Wolf 287)
12 Ophiuchi (HR 6171)
Gliese 569 A
Gliese 638
Gliese 367
Gliese 803
Gliese 678.1 A (Wolf 751)

Gliese 352 (Ross 440)
Gliese 536
Gliese 49 (Wolf 46)
Gliese 22 A
HR 5256
Gliese 75
Gliese 172
Gliese 436 (Ross 905)
Gliese 568 A (Ross 52)
Gliese 748 (Wolf 1062)
Gliese 127.1 A
Gliese 453
Alpha Mensae
Gliese 487
Gliese 3804
Gliese 846 (Wolf 1340)
Gliese 649 (Ross 860)
Gliese 117
Gliese 431
78 Beta Geminorum (Pollux)
Gliese 508
Gliese 595
Gliese 87 (Wolf 124)
Gliese 341
Iota Persei
Gliese 373
Gliese 488
Gliese 654 (Wolf 636)
Gliese 3459
Gliese 1206
Gliese 3412

Gliese 617 A (Lalande 29917)
Gliese 653 (Wolf 635)
40 Zeta Herculis (HR 6212)
Gliese 145
Gliese 9492
Gliese 617 B
Gliese 413.1
Gliese 660 A
Gliese 86
8 Delta Trianguli
Gliese 553.1 (Wolf 1478)
Gliese 228 (Ross 79)
Gliese 909 A (HR 9038)
Gliese 740
5 Beta Virginis (Zavijah)
Gliese 519
Gliese 754.1 A
Gliese 4333
Gliese 79
94 Beta Leonis (Denebola)
Gliese 688
Gliese 706 (Lalande 33439)
54 Piscium
Gliese 505 A
Gliese 173
Gliese 1148 (Ross 1003)

13 Theta Persei
Gliese 320
Gliese 370
Gliese 208
41 Gamma Serpentis (HR 5933)
Gliese 361 (Ross 85)
16 Alpha Bootis (Arcturus)



8 Eta Bootis (Mufrid)
11 Leonis Minoris
Gliese 4122
Gliese 169
Gliese 70
Gliese 9520
Gliese 494 B (Ross 458)
Gliese 902
Gliese 4070 (Ross 145)
Gliese 9236
Gliese 2
Gliese 567 (Lalande 27137)
Gliese 362
Gliese 669 A (Ross 868)
Gliese 9680

Gliese 103
Gliese 851 (Ross 271)
Gliese 118
Zeta Doradus
Gliese 1075
Gliese 2106
29 Gamma Virginis (Porrima)
24 Iota Pegasi (HR 8430)

Gliese 410
Gliese 735
Gliese 572
Gliese 3060 A
Gliese 542
Gliese 277 A
Gliese 414 A
49 Delta Capricorni (Deneb Algedi)
Gliese 96
Gliese 277 B (Ross 989)
Gliese 842
Gliese 3992 (Wolf 654)
Zeta-1 Reticuli
Zeta-2 Reticuli
Gliese 180
27 Lambda Serpentis (HR 5868)
Zeta Trianguli Australis (HR 6098)
Gliese 798
85 Pegasi (HR 9088)
Gliese 821 (Wolf 918)
Gliese 82 (Ross 15)
Gliese 309
Gliese 179 (Ross 401)
Gliese 192
Gliese 1097
Gliese 211
Gliese 360

Gliese 381
Gliese 268.3
Gliese 46
55 Rho-1 Cancri
Gliese 390
Gliese 671
Beta Trianguli Australis (HR 5897)
Gliese 435
Gliese 212

Gliese 142
Gliese 302 (Lalande 16304)
Gliese 806
Gliese 91
Gliese 3708 A
15 Lambda Aurigae
Gliese 2151
Gliese 422
Gliese 95
Gliese 863
Gliese 2069 D
Gliese 67 (HR 483)
44 i Bootis (HR 5618)
Gliese 206 (Ross 42)
Gliese 454 (Lalande 22585)
Gliese 3452
36 Ursae Majoris (HR 4112)
Gliese 620.1 A (HR 6094)
Gliese 675 (Lalande 32047)
Gliese 775
Gliese 3722
Gliese 2138

Gliese 349
Gliese 114.1 A
Gliese 895 (Ross 302)
Gliese 2046
Gliese 521
Gliese 204 (Wolf 1449)
Gliese 167
Gliese 722 (HR 6998)
Gliese 865
Gliese 707
13 Alpha Aurigae (Capella)
Gliese 469 (Wolf 414)
Gliese 620.1 B

Gliese 425 A
Gliese 174
Gliese 556
Gliese 525 (Wolf 497)
Gliese 716
Gliese 507 A
58 Eridani
Gliese 597 (Ross 1057)
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Last edited by Agemegos; 08-22-2018 at 06:12 AM. Reason: teh
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Old 08-22-2018, 06:24 AM   #14
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Default Re: Stellar Mapping

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A negative parallax could be the result of high proper motion or noisy data with large error bars.
You can get wacky parallaxes from telescopic binaries, too.
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Old 08-22-2018, 10:25 AM   #15
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Default Re: Stellar Mapping

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Originally Posted by Agemegos View Post
There are star names in XHIP. Down in the last group of data, sixth from the bottom of the page, just before "Group" and the references.
Ok, I'm just missing all kinds of stuff. I missed the "Name" field.

Thanks again, I'll be re-searching with that field checked.

Now if only there were a flag for HABCAT status... :)

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Old 08-22-2018, 02:58 PM   #16
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Default Re: Stellar Mapping

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I found some other archives where you can search stellar datasets (other than Vizier). Here is one from the Gaia project. And here is one from NASA.

So I'll get this eventually, but for now I'm still struggling. ... The Hipparcos search doesn't let you limit the search by parallax, just RA and DEC, so that's a bother since otherwise it has everything I want. ...
For future reference (e.g., other searches using the Vizier interface), you can limit the search by parallax, or any other quantity in the database. In the main body of the search page, there's a long list of columns in the database (for Hipparcos, this includes "recno", "HIP", "Comp", "Classes", etc.). Each row has a tickbox for "Show", a radio button for "Sort", the "Name" of the specific database column, and then a text box ("Constraint"), where you can enter a constraint for your search. Whether or not the data in a particular column shows up in the results depends on whether the "Show" box has been ticked.

So if you want only stars between 5 and 6 parsecs, you could enter "5..6" in the "Dist" row (20th row, I think). To get all stars with distances <= 10 pc, you'd enter "<= 10" in the box. At the top of the list of columns, there's a link "Constraints (?)" which will give you a pop-up window explaining the formatting of how to specify constraints.
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Old 08-22-2018, 03:14 PM   #17
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Default Re: Stellar Mapping

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Now if only there were a flag for HABCAT status... :)
I'm puzzled by all the M-class red dwarfs on the HabCat list while it overlooks a number of K, G and F stars (admittedly they are the quieter red dwarfs, so less chances of solar flares stripping away atmospheres). Tide-locking or 3:2 orbital:rotation resonances, and lack of bright enough light in the right wavelengths for photosynthesis (to give and maintain oxygen in atmospheres instead of CO2) seem to be factors against the inclusion of anything dimmer than an M1, in my opinion, but HabCat lists quite a few stars down to M5 in brightness.

Maybe I'm more pessimistic about the likelihood of habitability of comfort zone planets around cooler stars than the HabCat authors.
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Old 08-22-2018, 03:36 PM   #18
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I have a copy of the original Turnbull and Tarter paper here. On a quick check, the most likely reason is those brighter stars are also younger. T&T set a lower limit for complex life at 3 billion years (though they admit this is somewhat arbitrary).
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Old 08-22-2018, 08:31 PM   #19
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Maybe I'm more pessimistic about the likelihood of habitability of comfort zone planets around cooler stars than the HabCat authors.
If so, you are not alone. I, too, doubt that M-type and perhaps even the cooler K-type stars are plausible places for planets habitable to Humanity. I pretend for SF that I believe that maybe, a few of the warmest Ms, but my heart is not in it.
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Old 08-22-2018, 10:19 PM   #20
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Habitability aside, I've been working on a chart to help determine distance in lightyears from Star A to Star B. For this chart, I've been using the Galactic Coordinate system, with data pulled from stellar-database.com, with all numbers rounded to two decimal places.

For the chart itself, I limited it to M2 or warmer stars (Proxima being a notable exception for plot reasons), all within 20 lightyears of one the following stars: Sol, Alpha Centauri, Sirius, Epsilon Eridani, 61 Cygni, and Epsilon Indi. In my setting, I've recently made a change which puts Sirius (by interstellar treaty) as the center of the core worlds; Sol, 61 Cygni A, and Epsilon Indi are the home systems of the three major spacefaring species in the core worlds. Alpha Centauri A is home to one of the lesser species, and Epsilon Eridani is an independent human colony that has maneuvered itself into the position of being the capital of human colonists that don't want to answer to Earth.


The chart itself was done in OpenOffice Calc, and isn't complete; I'm half-thinking of making a searchable function which would let you pick two stars and have it spit out a distance between them.
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