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Mean object RA, Dec: 18 28 30 -09 58 14 (277.1289040 -9.9708330)
Mean object l, b: 21.4565 0.4912

Maser object G21.457+0.491

Other names: 0H 21.5+0.5, 18257-1000, IRAS18257-1000 npl, G21.457+0.491-1612A, G21.457+0.491-1612B, IRAS 18257-1000, OH021.457+00.491, OH21.3+0.4, OH21.5+0.5, IRAS 18257-1000.

Detected/non-detected masers in the object: +H2O +OH +SiO