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We present an independent discovery and detailed characterisation of K2-280b,a transiting low density warm sub-Saturn in a 19.9-day moderately eccentricorbit (e = 0.35_{-0.04}^{+0.05}) from K2 campaign 7. A joint analysis of highprecision HARPS, HARPS-N, and FIES radial velocity measurements and K2photometric data indicates that K2-280b has a radius of R_b = 7.50 +/- 0.44R_Earth and a mass of M_b = 37.1 +/- 5.6 M_Earth, yielding a mean density of0.48_{-0.10}^{+0.13} g/cm^3. The host star is a mildly evolved G7 star with aneffective temperature of T_{eff} = 5500 +/- 100 K, a surface gravity of log(g)= 4.21 +/- 0.05 (cgs), and an iron abundance of [Fe/H] = 0.33 +/- 0.08 dex, andwith an inferred mass of M_star = 1.03 +/- 0.03 M_sun and a radius of R_star =1.28 +/- 0.07 R_sun. We discuss the importance of K2-280b for testing formationscenarios of sub-Saturn planets and the current sample of this intriguing groupof planets that are absent in the Solar System.

K2-280b -- a low density warm sub-Saturn around a mildly evolved star