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Optical  UBVRI  photometry and medium‐resolution spectroscopy of the Type Ib supernova SN 2009jf, during the period from  ∼ −15  to +250 d, with respect to the  B  maximum are reported. The light curves are broad, with an extremely slow decline. The early post‐maximum decline rate in the  V  band is similar to SN 2008D; however, the late‐phase decline rate is slower than other Type Ib supernovae studied. With an absolute magnitude of   M V  =−17.96 ± 0.19  at peak, SN 2009jf is a normally bright supernova. The peak bolometric luminosity and the energy deposition rate via the  56 Ni  → 56  Co chain indicate that  ∼0.17 +0.03  −0.03  M ⊙   of  56 Ni was ejected during the explosion. The He  i  5876 Å line is clearly identified in the first spectrum of day  ∼ −15 , at a velocity of  ∼16 000 km s −1  . The [O  i ] 6300–6364 Å line seen in the nebular spectrum has a multipeaked and asymmetric emission profile, with the blue peak being stronger. The estimated flux in this line implies that  ≳1.34 M ⊙   oxygen was ejected. The slow evolution of the light curves of SN 2009jf indicates the presence of a massive ejecta. The high expansion velocity in the early phase and broader emission lines during the nebular phase suggest it to be an explosion with a large kinetic energy. A simple qualitative estimate leads to the ejecta mass of   M  ej = 4–9 M ⊙   and kinetic energy   E  K = 3–8 × 10 51  erg . The ejected mass estimate is indicative of an initial main‐sequence mass of  ≳20–25 M ⊙  .

Optical studies of SN 2009jf: a Type Ib supernova with an extremely slow decline and aspherical signature