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Post Info TOPIC: Solar neighbourhood
Blobrana


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RE: Solar neighbourhood
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Title: The Solar Neighbourhood XVII: Parallax Results from the CTIOPI 0.9m Program -- Twenty New Members of the RECONS 10 Parsec Sample
Authors: Todd J. Henry, Wei-Chun Jao, John P. Subasavage, Thomas D. Beaulieu, Philip A. Ianna, Edgardo Costa, Rene A. Mendez

Astrometric measurements for 25 red dwarf systems are presented, including the first definitive trigonometric parallaxes for 20 systems within 10 pc of the Sun, the horizon of the RECONS sample. The three nearest systems that had no previous trigonometric parallaxes (other than perhaps rough preliminary efforts) are SO 0253+1652 (3.84 ± 0.04 pc, the 23rd nearest system), SCR 1845-6357 AB (3.85 ± 0.02 pc, 24th), and LHS 1723 (5.32 ± 0.04 pc, 56th). In total, seven of the systems reported here rank among the nearest 100 stellar systems. Supporting photometric and spectroscopic observations have been made to provide full characterization of the systems, including complete VRIJHK photometry and spectral types. A study of the variability of 27 targets reveals six obvious variable stars, including GJ 1207, for which we observed a flare event in the V band that caused it to brighten by 1.7 mag.
Improved parallaxes for GJ 54 AB and GJ 1061, both important members of the 10 pc sample, are also reported. Definitive parallaxes for GJ 1001 A, GJ 633, and GJ 2130 ABC, all of which have been reported to be within 10 pc, indicate that they are beyond 10 pc. From the analysis of systems with (previously) high trigonometric parallax errors, we conclude that parallaxes with errors in excess of 10 mas are insufficiently reliable for inclusion in the RECONS sample. The cumulative total of new additions to the 10 pc sample since 2000 is now 34 systems -- 28 by the RECONS team and six by other groups. This total represents a net increase of 16% in the number of stellar systems reliably known to be nearer than 10 pc.

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Stars within 50 light years of the Sun



Catalog Name               Equatorial     Galactic    Classification     Visual Abs  Prllx   Dist     Proper Name     Notes
                           Coordinates   Coordinates                      Mag   Mag          (ly)  
                           RA     Dec      l°    b°
Sun                        ---     ---    --     --   G2V                -26.8  4.83   --    0.00     Sol           Has 9 planets
Alpha Centauri           14 39.6 -60 50  315.7  -0.7  G2V+K1V+M5.5V      -0.07  4.28 742.12  4.39     Rigil Kentaurus
Alpha Canis Majoris      06 45.1 -16 42  227.2  -8.9  A1V+DA2            -1.44  1.45 379.21  8.60     Sirius
Epsilon Eridani          03 32.9 -09 27  195.8 -48.1  K2V                 3.72  6.18 310.75 10.50                   Has a planet
Alpha Canis Minoris      07 39.3 +05 13  213.7 +13.0  F5IV-V+DA           0.40  2.68 285.93 11.41     Procyon
61 Cygni                 21 06.9 +38 44   82.3  -5.8  K5V+K7V             4.79  7.07 285.42 11.43  
Epsilon Indi             22 03.4 -56 47  336.2 -48.0  K4V+T1+T6           4.69  6.89 275.76 11.83  
Tau Ceti                 01 44.1 -15 56  173.1 -73.4  G8V                 3.49  5.68 274.17 11.90  
Omicron² Eridani         04 15.3 -07 39  200.8 -38.1  K1V+DA4+M4.5V       4.43  5.92 198.24 16.45     Keid
70 Ophiuchi              18 05.5 +02 30   29.9 +11.4  K0V+K5V             4.03  5.50 196.62 16.59  
Alpha Aquilae            19 50.8 +08 52   47.7  -8.9  A7V                 0.76  2.20 194.44 16.77     Altair
Sigma Draconis           19 32.4 +69 39  101.3 +21.9  K0V                 4.67  5.87 173.41 18.81     Alsafi
HR5568                   14 57.5 -21 24  338.2 +32.7  K5V+M1V+M3V+T8      5.72  6.86 169.32 19.26  
Eta Cassiopeiae          00 49.1 +57 48  122.6  -5.1  G0V+K7V             3.46  4.59 167.99 19.42     Achird
36 Ophiuchi              17 15.3 -26 36  358.3  +6.9  K1V+K1V+K5V         4.33  5.46 167.08 19.52  
HR7703                   20 11.2 -36 06    5.2 -30.9  K3V+M3.5V           5.32  6.41 165.24 19.74  
82 Eridani               03 19.9 -43 04  250.8 -56.1  G5V                 4.26  5.35 165.02 19.76  
Delta Pavonis            20 08.7 -66 10  329.8 -32.4  G5IV-V              3.55  4.62 163.73 19.92  
HR8832                   23 13.3 +57 10  109.9  -3.2  K3V                 5.57  6.50 153.24 21.28  
Xi Boötis                14 51.4 +19 06   23.1 +61.4  G8V+K4V             4.54  5.41 149.26 21.85  
HR753                    02 36.1 +06 53  163.4 -47.6  K3V+M4.5V           5.79  6.50 138.72 23.51  
HR6426                   17 19.0 -34 59  351.8  +1.4  K3V+K5V+M2.5V       5.91  6.61 138.2  23.6   
HR222                    00 48.4 +05 16  121.5 -57.6  K2V                 5.74  6.38 134.04 24.33  
107 Piscium              01 42.5 +20 16  138.9 -41.0  K1V                 5.24  5.87 133.91 24.36  
Beta Hydri               00 25.8 -77 15  304.8 -39.8  G1IV                2.82  3.45 133.78 24.38  
Mu Cassiopeiae           01 08.3 +54 55  125.4  -7.9  G5V+M5V             5.17  5.78 132.40 24.63  
HR8721                   22 56.4 -31 33   15.9 -64.6  K4V                 6.48  7.07 130.94 24.91                  TW PsA, 0.87 light years from Fomalhaut
Alpha Piscis Austrini    22 57.7 -29 37   20.5 -64.9  A3V                 1.17  1.74 130.08 25.07     Fomalhaut
Alpha Lyrae              18 36.9 +38 47   67.5 +19.2  A0V                 0.03  0.58 128.93 25.30     Vega         Surrounded by a ring of dust at 80AU.
Pi³ Orionis              04 49.8 +06 57  191.5 -23.1  F6V                 3.19  3.67 124.60 26.18     Tabit
Chi Draconis             18 21.1 +72 43  103.5 +28.1  F7V+G?              3.55  4.02 124.11 26.28  
p Eridani                01 39.8 -56 11  289.6 -59.7  K0V+K2V             5.07  5.52 122.75 26.57  
Xi Ursae Majoris         11 18.2 +31 32  195.1 +69.3  G0V+G5V+K?+M?       3.86  4.25 119.7  27.2      Alula Australis
Beta Canum Venaticorum   12 33.7 +41 21  136.1 +75.3  G0V                 4.24  4.63 119.46 27.30     Chara
Mu Herculis              17 46.5 +27 43   52.4 +25.6  G5IV+M3V+M4V        3.42  3.81 119.05 27.40  
61 Virginis              13 18.6 -18 18  311.9 +44.1  G6V                 4.74  5.09 117.30 27.81  
Zeta Tucanae             00 20.1 -64 52  308.3 -51.9  G0V                 4.23  4.56 116.38 28.03  
Chi¹ Orionis             05 54.4 +20 16  188.5  -2.7  G0V+M?              4.39  4.70 115.43 28.26  
HR6416                   17 19.1 -46 38  342.3  -5.3  G8V+M0V             5.47  5.75 113.81 28.66  
HR1614                   05 00.8 -05 45  205.1 -27.2  K3V                 6.22  6.49 113.46 28.75  
HR7722                   20 15.3 -27 01   15.6 -29.4  K1V                 5.73  6.00 113.33 28.78  
Gamma Leporis            05 44.5 -22 26  226.8 -24.3  F7V+K2V             3.59  3.83 111.49 29.25  
Delta Eridani            03 43.2 -09 45  198.1 -46.0  K0IV                3.52  3.74 110.58 29.50     Rana
Beta Comae Berenices     13 11.9 +27 52   43.5 +85.4  G0V                 4.23  4.43 109.23 29.86  
HR4550                   11 53.0 +37 43  168.5 +73.8  G8V+M5.5V           6.42  6.61 109.21 29.87               Groombridge 1830, High velocity star
Kappa¹ Ceti              03 19.4 +03 22  178.2 -43.1  G5V                 4.84  5.03 109.18 29.87  
Gamma Pavonis            21 26.4 -65 21  328.2 -40.3  F7V                 4.21  4.39 108.50 30.06  
HR4523                   11 46.5 -40 30  289.8 +20.7  G5V+M4V             4.89  5.06 108.23 30.14  
HR4458                   11 34.5 -32 49  284.8 +27.3  K0V+DC              5.96  6.06 104.84 31.11  
61 Ursae Majoris         11 41.1 +34 12  183.6 +73.3  G8V                 5.31  5.41 104.81 31.12  
12 Ophiuchi              16 36.4 -02 19   13.7 +28.4  K0V                 5.77  5.82 102.27 31.89  
HR511                    01 47.7 +63 51  129.1  +1.7  K0V                 5.63  5.64 100.24 32.54  
HR5256                   13 57.5 +61 29  109.6 +53.9  K3V                 6.49  6.47  98.97 32.96  
Alpha Mensae             06 10.2 -74 45  285.8 -28.8  G5V                 5.08  5.05  98.54 33.10  
Beta Geminorum           07 45.3 +28 01  192.2 +23.4  K0III               1.16  1.09  96.74 33.72     Pollux     Nearest giant star
HR857                    02 52.5 -12 46  192.1 -58.3  K1V                 6.05  5.97  96.33 33.86  
Iota Persei              03 09.1 +49 36  144.6  -7.4  G0V                 4.05  3.94  94.93 34.36  
HR9038                   23 52.4 +75 32  119.2 +13.1  K3V+M2V             6.36  6.19  92.68 35.19  
Zeta Herculis            16 41.3 +31 36   52.7 +40.3  G0IV+G7V            2.81  2.64  92.63 35.21     Rutilicus
Delta Trianguli          02 17.1 +34 13  142.4 -25.4  G0V+M5V             4.84  4.66  92.20 35.38  
Beta Virginis            11 50.7 +01 45  270.5 +60.8  F8V                 3.59  3.40  91.74 35.55     Zavijava
HR637                    02 10.4 -50 49  275.9 -62.0  K0V                 6.12  5.93  91.63 35.60                Has a planet
Beta Leonis              11 49.1 +14 34  250.6 +70.8  A3V                 2.14  1.92  90.16 36.18     Denebola
HR6806                   18 09.6 +38 27   65.3 +24.2  K2V                 6.38  6.15  90.11 36.20  
54 Piscium               00 39.4 +21 15  119.2 -41.5  K0V                 5.88  5.65  90.03 36.23                Has a planet
Gamma Serpentis          15 56.5 +15 39   27.7 +45.7  F6V                 3.85  3.62  89.92 36.27  
11 Leonis Minoris        09 35.7 +35 48  188.5 +47.8  G8V+M5V             5.40  5.16  89.45 36.46  
Theta Persei             02 44.2 +49 13  141.2  -9.6  F7V+M1V             4.10  3.85  89.03 36.63  
Alpha Boötis             14 15.7 +19 10   15.1 +69.1  K2III              -0.05 -0.31  88.85 36.71     Arcturus   Most luminous star within 50ly
Eta Boötis               13 54.7 +18 23    5.3 +73.0  G0IV                2.68  2.41  88.17 36.99     Muphrid
HR5553                   14 53.4 +19 09   23.6 +60.9  K1V                 6.00  5.69  86.69 37.62  
Zeta Doradus             05 05.5 -57 28  266.0 -36.7  F7V+K7V             4.71  4.38  85.83 38.00  
Lambda Serpentis         15 46.4 +07 21   15.7 +44.1  G0V                 4.42  4.07  85.08 38.34  
Iota Pegasi              22 07.0 +25 20   82.3 -24.3  F5V                 3.77  3.42  85.06 38.34  
Delta Capricorni         21 47.0 -16 07   37.6 -46.0  A5V                 2.85  2.49  84.58 38.56     Deneb Algedi
Gamma Virginis           12 41.7 -01 26  297.8 +61.3  F0V+F0V             2.74  2.38  84.53 38.59     Porrima
Zeta Reticuli            03 18.2 -62 30  279.0 -47.2  G1V+G2V             4.62  4.21  82.65 39.46  
Zeta Trianguli Australis 16 28.5 -70 05  319.5 -14.6  F9V                 4.90  4.49  82.61 39.48  
HR3384                   08 32.9 -31 30  252.3  +5.0  K0V                 6.38  5.95  82.15 39.70  
HR1925                   05 41.3 +53 28  158.4 +12.0  K1V+M1V             6.21  5.77  81.69 39.93  
Beta Trianguli Australis 15 55.1 -63 25  321.9  -7.5  F2IV                2.83  2.38  81.24 40.15  
85 Pegasi                00 02.2 +27 04  109.6 -34.5  G3V+K6V             5.80  5.33  80.63 40.45  
Rho¹ Cancri              08 52.6 +28 19  196.8 +37.7  G8V+M3.5V           5.96  5.47  79.80 40.87               Has 3 planets
HR3259                   08 18.4 -12 37  234.6 +12.8  G8V                 5.95  5.45  79.48 41.04  
HR483                    01 41.8 +42 36  132.7 -19.3  G2V                 4.96  4.45  79.09 41.24  
Lambda Aurigae           05 19.1 +40 05  167.7  +1.5  G0V                 4.69  4.18  79.08 41.24  
HR683                    02 19.0 -25 56  214.5 -70.4  G8V                 6.33  5.81  78.88 41.35 
44 Boötis                15 03.8 +47 39   80.4 +57.1  G1V+G2V             4.83  4.30  78.39 41.61  
HR6518                   17 25.0 +67 18   97.6 +33.2  K0V                 6.44  5.90  78.14 41.74 
36 Ursae Majoris         10 30.6 +55 58  154.3 +51.7  F8V+K7V             4.82  4.28  77.82 41.91  
HR6094                   16 24.0 -39 11  341.6  +7.2  G3V+DA2             5.37  4.82  77.69 41.98              Has a planet
HR4587                   12 00.7 -10 26  283.1 +50.5  K0IV                5.54  4.99  77.48 42.10  
Alpha Aurigae            05 16.7 +45 59  162.6  +4.6  G5III+G0III+M2V+M4V 0.08 -0.48  77.29 42.20     Capella  2 giant stars + 2 red dwarfs 0.14ly away
HR6998                   18 38.9 -21 03   12.7  -6.8  G5V                 5.85  5.28  77.02 42.35  
58 Eridani               04 47.6 -16 56  215.4 -34.8  G3V                 5.49  4.87  75.10 43.43  
Upsilon Andromedae       01 36.8 +41 24  132.0 -20.7  F8V+M4.5V           4.10  3.45  74.25 43.93              Has 3 planets
Theta Ursae Majoris      09 32.9 +51 40  165.5 +45.7  F6IV+M?             3.17  2.52  74.15 43.99     Al Haud
HR8501                   22 18.3 -53 37  339.0 -51.4  G1V+M?              5.36  4.69  73.47 44.39  
HR8                      00 06.6 +29 01  111.3 -32.8  G8V                 6.07  5.39  72.98 44.69  
Beta Aquilae             19 55.3 +06 24   46.1 -11.1  G8IV+M3V            3.71  3.03  72.95 44.71     Alshain
10 Tauri                 03 36.9 +00 24  185.1 -41.7  F8V                 4.29  3.60  72.89 44.75  
Iota Piscium             23 40.0 +05 37   92.5 -53.0  F7V                 4.13  3.43  72.51 44.98  
Gamma Cephei             23 39.3 +77 37  119.0 +15.3  K1IV+M?             3.21  2.51  72.50 44.99     Errai     Has a planet
Tau¹ Eridani             02 45.1 -18 34  200.8 -62.5  F6V                 4.47  3.74  71.56 45.58  
18 Scorpii               16 15.6 -08 22    4.7 +29.2  G1V                 5.49  4.76  71.30 45.74  
47 Ursae Majoris         10 59.5 +40 25  175.8 +63.4  G0V                 5.03  4.29  71.04 45.91                Has 2 planets
26 Draconis              17 35.0 +61 52   91.0 +32.7  G1V+K3V+M1V         5.23  4.49  70.98 45.95  
Alpha Fornacis           03 12.1 -28 59  224.7 -59.0  F7IV+G7V            3.80  3.05  70.86 46.03     Fornacis
HR7578                   19 54.3 -23 56   17.2 -23.9  K3V                 6.22  5.46  70.34 46.37  
Pi¹ Ursae Majoris        08 39.2 +65 01  150.6 +35.7  G1V                 5.63  4.86  70.07 46.55  
Alpha Ophiuchi           17 34.9 +12 33   35.9 +22.6  A5III-IV            2.08  1.30  69.84 46.70     Rasalhague
Eta Cephei               20 45.3 +61 50   97.9 +11.6  K0IV                3.41  2.63  69.73 46.77  
72 Herculis              17 20.7 +32 28   55.9 +32.3  G1V                 5.38  4.59  69.48 46.94  
Nu² Lupi                 15 21.8 -48 19  327.1  +7.4  G2V                 5.65  4.83  68.70 47.48  
Theta Boötis             14 25.2 +51 51   93.8 +59.7  F7V+M3V             4.04  3.22  68.63 47.52     Asellus Primus
Iota Ursae Majoris       08 59.2 +48 02  171.5 +40.8  A7V+M1V+M?          3.12  2.29  68.32 47.74     Talita
HR7898                   20 40.2 -23 46   21.3 -33.8  G8V                 6.36  5.53  68.28 47.77                   1.68ly from Psi Capricorni
111 Tauri                05 24.4 +17 23  187.2 -10.3  F8V+K4V+K5V         5.00  4.17  68.19 47.83  
Psi Serpentis            15 44.0 +02 30    9.7 +42.0  G5V+M?              5.86  5.03  68.16 47.85  
Psi Capricorni           20 46.1 -25 16   20.0 -35.5  F5V                 4.13  3.30  68.16 47.85  
Alpha Corvi              12 08.4 -24 43  290.6 +37.1  F2V                 4.02  3.17  67.71 48.17   Alchibah
I Hydrae                 09 42.2 -23 54  256.7 +21.5  G0V                 4.93  4.07  67.19 48.54  
20 Leonis Minoris        10 01.0 +31 55  195.0 +52.9  G2V                 5.37  4.50  67.14 48.58  
HR209                    00 45.8 -47 33  305.7 -69.6  G5V                 5.80  4.93  66.92 48.74  
Alpha Cephei             21 18.6 +62 35  101.0  +9.2  A7IV-V              2.45  1.58  66.84 48.80     Alderamin
HR7162                   18 57.0 +32 54   63.4 +13.3  G0V+K1V             5.20  4.32  66.76 48.86  
Eta Leporis              05 56.4 -14 10  219.8 -18.5  F0V                 3.71  2.82  66.47 49.07  
Nu Phoenicis             01 15.2 -45 31  290.1 -71.0  F8V                 4.97  4.08  66.43 49.10  
19 Draconis              16 56.0 +65 08   95.7 +36.5  F6V                 4.88  3.99  66.28 49.21  
31 Aquilae               19 25.0 +11 56   47.4  -1.9  G8IV                5.17  4.27  66.01 49.41  
HR3018                   07 45.6 -34 10  249.1  -4.8  G0V+DC              5.36  4.45  65.79 49.58  
HR5864                   15 47.5 -37 54  337.2 +13.0  G6V+DA7             6.01  5.09  65.60 49.72  
Mu Arae                  17 44.1 -51 50  340.1 -11.5  G5V                 5.12  4.23  65.46 49.83                  Has a planet








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