# HD 135344

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Young star system in the constellation of Lupus

HD 135344 The orbit of HD 135344 Ab around HD 135344 A (blocked by a coronagraph) Credit: Stolker et al Observation data Epoch J2000 Equinox ICRS Constellation Lupus[1] A Right ascension 15h 15m 48.9463s[2] Declination −37° 08′ 55.731″[2] Apparent magnitude (V) 7.76[3] B Right ascension 15h 15m 48.4460s[4] Declination −37° 09′ 16.024″[4] Apparent magnitude (V) 8.708[5] Characteristics A Evolutionary stage main sequence[6] Spectral type A0V[3] B Evolutionary stage main sequence[4] Spectral type F8V[5] Astrometry A Radial velocity (Rv) 29.31±3.29[2] km/s Proper motion (μ) RA: −18.738 mas/yr[2] Dec.: −24.008 mas/yr[2] Parallax (π) 7.4105±0.0403 mas[2] Distance 440 ± 2 ly (134.9 ± 0.7 pc) B Radial velocity (Rv) −5.34±1.48[4] km/s Proper motion (μ) RA: −19.210 mas/yr[4] Dec.: −23.268 mas/yr[4] Parallax (π) 7.4074±0.0240 mas[4] Distance 440 ± 1 ly (135.0 ± 0.4 pc) Details A Mass 2.32[7] M☉ Radius 1.50±0.01[6] R☉ Luminosity 16.6±0.4[6] L☉ Surface gravity (log g) 4.1±0.1[6] cgs Temperature 9540±100[6] K Metallicity [Fe/H] 0.10[8] dex B Mass 1.46+0.07 −0.04[9] M☉ Radius 1.86 ± 0.08[9][a] R☉ Luminosity 5.13±0.12[9] L☉ Surface gravity (log g) 4.15±0.05[9] cgs Temperature 6,375±125[9] K Metallicity [Fe/H] +0.00±0.13[9] dex Rotation 0.25±0.03[9] days Rotational velocity (v sin i) 70±4[9] km/s Age 10.48+0.97 −0.49[9] Myr Other designations CD−36 10010, HD 135344[3] A: CPD−36 6758, SAO 206463, TYC 7324-1671-1[3] B: CPD−36 6759, SAO 206462, TYC 7324-1676-1[5] Database references SIMBAD A B

**HD 135344** is a young [binary star](/source/Binary_star) system about 440 [light-years](/source/Light-year) away from Earth in the [constellation](/source/Constellation) [Lupus](/source/Lupus_(constellation)). The primary star hosts a directly imaged [gas giant](/source/Gas_giant) planet, while the secondary star, also known as **SAO 206462**, is surrounded by a [circumstellar disk](/source/Circumstellar_disk) of gas with clearly defined spiral arms and has three planet candidates.

## HD 135344 A

HD 135344 A is an [A-type main-sequence star](/source/A-type_main-sequence_star). It hosts a directly imaged [gas giant](/source/Gas_giant) planet, about 10 times the [mass of Jupiter](/source/Jupiter_mass), discovered in 2025 with [VLT/SPHERE](/source/Spectro-Polarimetric_High-Contrast_Exoplanet_Research).[6]

The HD 135344 A planetary system[6] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (years) Eccentricity Inclination (°) Radius b 10.0+1.4 −1.9 MJ 16.5+2.8 −2.0 — 0.5±0.2 73.6+2.8 −4.7 1.45+0.06 −0.03 – 1.60+0.07 −0.06 RJ

## HD 135344 B

The disk around HD 135344B (SAO 206462) imaged by [VLT/SPHERE](/source/Spectro-Polarimetric_High-Contrast_Exoplanet_Research)

HD 135344 B, also known as SAO 206462, has been known to have a [circumstellar disk](/source/Circumstellar_disk) since the 1990s, first detected based on an [infrared excess](/source/Infrared_excess).[10] Observations of the structure of the disk were presented in July 2009 by Carol Grady, astronomer of Eureka Scientific, headquartered in the [Goddard Space Flight Center](/source/Goddard_Space_Flight_Center) at [NASA](/source/NASA). It was the first of this class that exhibited a high degree of clarity and was observed using several space telescopes ([Hubble](/source/Hubble_Space_Telescope), [FUSE](/source/Far_Ultraviolet_Spectroscopic_Explorer), [Spitzer](/source/Spitzer_Space_Telescope)) and ground-based telescopes ([Gemini Observatory](/source/Gemini_Observatory) and [Subaru Telescope](/source/Subaru_Telescope), situated in [Hawaii](/source/Hawaii)), through an international research program of young stars and of stars with planets. A number of astronomers of different observatories collaborated.[11] The disk's diameter is about twice the size of the orbit of [Pluto](/source/Pluto).[12]

### Evidence of planets

The protoplanetary disk of HD 135344B as seen by the [ERIS instrument](/source/ERIS_(instrument)) of the VLT with the position of a potential forming exoplanet indicated

The HD 135344 B (SAO 206462) planetary system Companion (in order from star) Mass Semimajor axis (AU) Orbital period (years) Eccentricity Inclination (°) Radius b (unconfirmed) 2[13] MJ 28[13] — — — 2[13] RJ (unconfirmed) — 66±3[14] 424±25[14] — — — c (unconfirmed) 0.8±0.3[15] MJ 300.8+9.9 −9.5[15] — — — ~1.00[15] RJ

The pair of spiral arms around SAO 206462 have a rotation rate of −0.85 [degrees](/source/Degree_(angle)) per year, which are thought to be caused by a dynamically driving [protoplanet](/source/Protoplanet) within the disk, at a distance of 66±3 [astronomical units](/source/Astronomical_unit) and an orbital period of 424±25 years. This planet should be a challenge to be detected using [direct imaging](/source/Direct_imaging) due to the presence of dust particles obscuring it, but could be detected and confirmed via high-resolution spectroscopic observations.[14]

Another planet candidate around SAO 206462 has been detected using observations of the JWST's [NIRCam](/source/NIRCam) imaging instrument, with low [signal-to-noise ratio](/source/Signal-to-noise_ratio), a mass of 0.8±0.3 *M*J and a separation of 300 astronomical units. It has been dubbed CC1 (Companion candidate 1). Objects more massive than 2.2 *M*J at distances of up to 120 AU have been ruled out by the observations.[15]

A third planet candidate was detected by direct imaging in 2025, at the root of one of the disk's spiral arms. The object has a mass estimated at 2 MJ, and is highly embedded in gas and dust, possibly having its own protoplanetary disk. It has a separation of 28 AU from the host star and is likely shepherding the inner part of the disk.[13]

## Notes

1. **[^](#cite_ref-radius1_10-0)** Calculated, using the [Stefan-Boltzmann law](/source/Stefan-Boltzmann_law) and the star's [effective temperature](/source/Effective_temperature) and luminosity, with respect to the [solar](/source/Sun) nominal effective temperature of 5,772 [K](/source/Kelvin): ( 5 , 772 6 , 375 ) 4 ⋅ 10 0.71 = 1.86 R ⊙ . {\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{6,375}}{\biggr )}^{4}\cdot 10^{0.71}}}=1.86\ R_{\odot }.}

## References

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v t e Constellation of Lupus List of stars in Lupus Lupus in Chinese astronomy Stars Bayer α (Uridim) β γ δ ε ζ η θ ι κ λ μ ν1 ν2 ξ ο π ρ σ τ1 τ2 υ φ1 φ2 χ ψ1 ψ2 ω Flamsteed 1 (i) 2 (f) Variable RU EX GG GQ HR II IL IM KT (d) V407 V462 HR 5362 5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967 HD 134004 135344 136164 141943 142527 143811 Other Gliese 588 HIP 70849 Lupus-TR-3 SSSPM J1549−3544 WASP-132 Exoplanets GQ Lupi b HIP 70849 b Lupus-TR-3b WASP-178b Star clusters NGC 5749 NGC 5822 NGC 5824 NGC 5927 NGC 5986 Nebulae IC 4406 NGC 5882 Galaxies IC 4444 NGC 5530 NGC 5643 Astronomical events SN 1006 Category

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Adapted from the Wikipedia article [HD 135344](https://en.wikipedia.org/wiki/HD_135344) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_135344?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.