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Odin has successfully observed the molecular core rho Oph A in the 572.5 GHzrotational ground state line of ammonia, NH3 (J,K = 1,0 - 0,0). Theinterpretation of this result makes use of complementary molecular line dataobtained from the ground (C17O and CH3OH) as part of the Odin preparatory work.Comparison of these observations with theoretical model calculations of lineexcitation and transfer yields a quite ordinary abundance of methanol, X(CH3OH)= 3e-9. Unless NH3 is not entirely segregated from C17O and CH3OH, ammonia isfound to be significantly underabundant with respect to typical dense corevalues, viz. X(NH3) = 8e-10.Comment: 4 pages, 2 figures, 2 tables, to appear in Astron. Astrophys. Letter

First detection of NH3 ($\mathsf{1_0 \rightarrow 0_0}$) from a low mass cloud core

First detection of NH₃ ($\mathsf{1_0 \rightarrow 0_0}$) from a low mass cloud core