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Traditionally, the distance to NGC 4038/39 has been derived from the systemicrecession velocity, yielding about 20 Mpc for H_0 = 72 km/s/Mpc. Recently, thiswidely adopted distance has been challenged based on photometry of the presumedtip of the red giant branch (TRGB), which seems to yield a shorter distance of13.3+-1.0 Mpc and, with it, nearly 1 mag lower luminosities and smaller radiifor objects in this prototypical merger. Here we present a new distanceestimate based on observations of the Type Ia supernova (SN) 2007sr in thesouthern tail, made at Las Campanas Observatory as part of the CarnegieSupernova Project. The resulting distance of D(SN Ia) = 22.3+-2.8 Mpc [(m-M)_0= 31.74+-0.27 mag] is in good agreement with a refined distance estimate basedon the recession velocity and the large-scale flow model developed by Tonry andcollaborators, D(flow) = 22.5+-2.8 Mpc. We point out three serious problemsthat a short distance of 13.3 Mpc would entail, and trace the claimed shortdistance to a likely misidentification of the TRGB. Reanalyzing Hubble SpaceTelescope (HST) data in the Archive with an improved method, we find a TRGBfainter by 0.9 mag and derive from it a preliminary new TRGB distance ofD(TRGB) = 20.0+-1.6 Mpc. Finally, assessing our three distance estimates werecommend using a conservative, rounded value of D = 22+-3 Mpc as the bestcurrently available distance to The Antennae.

A New Distance to The Antennae Galaxies (NGC 4038/39) Based on the Type Ia Supernova 2007sr