HU Delphini

HU Delphini is a system of two red dwarf stars of spectral type M4.5V, located in constellation Delphinus at 28.9 light-years from Earth.^[1]

References

↑ Benedict, G. Fritz; McArthur, Barbara E.; Franz, Otto G.; Wasserman, Lawrence H.; Henry, Todd J. (2000). "Interferometric Astrometry of the Low-Mass Binary GL 791.2 (= HU Del) Using Hubble Space Telescope Fine Guidance Sensor 3: Parallax and Component Masses". The Astronomical Journal 120 (2): 1106–1112. arXiv:astro-ph/0005026. Bibcode:2000AJ....120.1106B. doi:10.1086/301495.

Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. (2014). "Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs". The Astrophysical Journal 784 (2): 156. arXiv:1312.3241. Bibcode:2014ApJ...784..156D. doi:10.1088/0004-637X/784/2/156. Table with parallaxes.

Celestial objects within 25–30 light-years →

Primary member type	Celestial objects by systems. Secondary members are listed in small print.

Subgiant stars

G-type	μ Her (27.4±0.2 ly) 3 red dwarfs: Ab B C

K-type	δ Eri «Rana» (29.49±0.06 ly)

Main-sequence
stars

A-type	Vega (α Lyr) (25.04±0.07 ly) Fomalhaut (α PsA) (25.13±0.09 ly) K-type main-sequence star TW PsA (B) (24.82 ± 0.12 ly) red dwarf LP 876-10 (C) (24.70 ± 0.22 ly) planet Ab

F-type	π³ Ori «Tabit» (26.2±0.2 ly) χ Dra (26.22±0.11 ly) K-type main-sequence star B ζ Tuc (28.0±0.2 ly) γ Lep (29.3±0.2 ly) K-type main-sequence star B

G-type	ξ UMa «Alula Australis» (27.25±0.18 ly) G-type main-sequence star Ba red dwarf Ab T-type brown dwarf WISE 1118+31 brown dwarf Bb β CVn «Chara» (27.3±0.2 ly) 61 Vir (27.8±0.2 ly) 3 planets: b c d χ¹ Ori (28.3±0.3 ly) red dwarf B 41 G. Ara (28.7±0.3 ly) red dwarf B β CBr (29.9±0.2 ly) κ¹ Cet (29.9±0.2 ly)

K-type	GJ 673 (25.12±0.14 ly) GJ 884 (26.6±0.3 ly) p Eri (26.57±0.31 ly) K-type main-sequence star B HD 50281 (28.4±0.3 ly) red dwarf B HR 1614 (28.8±0.3 ly) HR 7722 (28.8±0.3 ly) 2 planets: b c

M-type (red dwarfs)	LHS 1070 (25.2±0.5 ly) red dwarf B M-type brown dwarf C GJ 701 (25.3±0.3 ly) GJ 1093 (25.3±0.7 ly) GJ 480.1 (25.4±0.8 ly) GJ 382 (25.48±0.30 ly) GJ 1224 (25.77+0.22 −0.21 ly) DG CVn (25.9+5.5 −3.8 ly) Wolf 922 (25.9±0.5 ly) red dwarf B SSSPM J1138-7722 (26±3 ly) GJ 793 (26.08±0.23 ly) 2MASS J12140866-2345172 (~26.1 ly) 2MASS J19513587-3510375 (~26.1 ly) SCR 0838-5855 (~26.1 ly) GJ 257 (26.2±0.6 ly) red dwarf B GJ 623 (26.2±0.3 ly) red dwarf B GJ 1289 (26.4±0.6 ly) GJ 1105 (26.4±0.7 ly) GJ 686 (26.5±0.4 ly) GJ 300 (26.59±0.11 ly) GJ 493.1 (26.6±1.0 ly) GJ 48 (26.6±0.3 ly) GJ 747 (26.6±0.4 ly) red dwarf B SCR 1138-7721 (26.7±0.7 ly) GJ 486 (26.8±0.6 ly) GJ 1151 (26.8±0.7 ly) GJ 1227 (26.9±0.4 ly) 2MASS J18352154-3123385 (27.3±2 ly) red dwarf B GJ 1230 (27.0+1.7 −1.5 ly) 2 red dwarfs: B C GJ 232 (27.2±0.4 ly) AP Col (27.4±0.2 ly) GJ 3146 (27.6±1.7 ly) GJ 1154 (27.6±0.9 ly) GJ 1057 (27.6±0.9 ly) GJ 618 (27.6±0.6 ly) red dwarf B GJ 3076 (27.6+6.0 −4.2 ly) L 173-19 (27.6±4.9 ly) SCR 0640-0552 (~27.7 ly) HD 32450 (27.8±0.4 ly) red dwarf B GJ 450 (27.9±0.3 ly) GJ 877 (28.1±0.3 ly) GJ 745 (28.1±0.6 ly) red dwarf B GJ 867 (28.2±0.4 ly) red dwarf B GJ 3454 (28.2±0.2 ly) red dwarf B 2MASS J20490993-4012062 (28.2±4.8 ly) SCR 0630-7643 (28.6±0.5 ly) red dwarf B HU Del (28.6±0.5 ly) red dwarf B LDS 169 (28.6±0.8 ly) red dwarf B GJ 849 (28.6±0.5 ly) 2 planets: b c GJ 1103 (28.7±0.8 ly) red dwarf B GJ 1207 (28.8±0.4 ly) GJ 465 (29.0±0.7 ly) GJ 1277 (29.0±4.6 ly) GJ 3128 (29.1±0.5 ly) V374 Peg (29.1±0.9 ly) GJ 357 (29.3±0.5 ly) GJ 595 (29.4±3.5 ly) GJ 433 (29.5±0.5 ly) 2 planets: b c GJ 424 (29.7±0.3 ly) GJ 3801 (29.7±0.9 ly) GJ 2066 (29.9±0.5 ly) LHS 224 (29.9±0.8 ly) red dwarf B SCR 1826-6542 (~30 ly)

Subdwarf stars

G-type	Groombridge 1830 (29.9±0.2 ly)

Degenerate
stars

White dwarfs	L 97-12 (25.83±0.27 ly) G 99-47 (26.1±0.8 ly) WD 2359-434 (26.7±0.3 ly) Wolf 489 (26.9±0.8 ly) LP 701-29 (27.9±0.2 ly) GJ 318 (28.7±0.5 ly) LHS 1126 (29.5±0.3 ly) L 745-46 (29.7±0.2 ly) red dwarf B

Brown dwarfs

M-type	DENIS 0334-49 (27.04±0.83 ly) LHS 2065 (27.65±0.18 ly)

L-type	WISE 0607+2429 (25.4+4.6 −3.9 ly) WISE 1800+0134 (26.1±0.7 ly) 2MASS 0835-08 (27.9+2.9 −2.4 ly) WISE 1647+5632 (28.1+9.4 −5.6 ly) 2MASS 0036+1821 (28.6±0.2 ly) 2MASS J04390101-2353083 (29.5±1.1 ly) SDSS J1416+1348 (29.7±0.3 ly) T-type brown dwarf B 2MASS J03552337+1133437 (29.8+0.4 −0.3 ly)

T-type	2MASS 0348-6022 (~25.4 ly) 2MASS 0729-39 (25.8±1.8 ly) UGPS J0521+3640 (26.7+3.9 −3.2 ly) 2MASS 0727+1710 (29.0±0.2 ly)

Y-type	WISE 1405+5534 (25.3+4.4 −3.2 ly) WISE 1738+2732 (25.5+2.2 −1.8 ly) WISE 0647-6232 (28.4+3.3 −2.7 ly)

Italic are systems without known trigonometric parallax.

Stars of Delphinus

Bayer	α (Sualocin) β (Rotanev) γ δ ε (Deneb Dulfim) ζ η θ ι κ ρ Aql (Tso Ke)

Flamsteed	1 10 13 14 15 16 17 18

Variable	U V W TX TY BX CM DM DX EU HR HU LS LU MR V339

HR	7771 7774 7778 7793 7810 7813 7816 7820 7824 7839 7899 7907 7914 7954 7975 8010 8044 8057 8088

HD	194578 194841 195019 195909

Gliese	Gliese 795

Other	HAT-P-23 He 2-467 WASP-2 WISE 2056+1459

List

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