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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
Omicron▓ 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 Bo÷tis 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.
Pi│ 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
Chi╣ 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
Kappa╣ 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 Bo÷tis 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 Bo÷tis 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
Rho╣ 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 Bo÷tis 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
Tau╣ 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
Pi╣ 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
Nu▓ Lupi 15 21.8 -48 19 327.1 +7.4 G2V 5.65 4.83 68.70 47.48
Theta Bo÷tis 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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