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SN 1996ah was a supernova located in the spiral galaxy NGC 5640 in the constellation of Camelopardalis. [ 1 ] [ 2 ] It was discovered on June 6, 1996 by American astronomer Jean Mueller , who was using the 1.2-m Oschin Schmidt telescope in the course of the second Palomar Sky Survey .
M + Sn(hmds) 2 → M(hmds) 2 + Sn Long reaction times are required for this synthesis and when performed in the presence of coordinating solvents, such as dimethoxyethane , adducts are formed. Hence non-coordinating solvents such as benzene or toluene must be used to obtain the free complexes.
The Circinus Galaxy (ESO 97-G13) is a Seyfert galaxy [2] in the constellation of Circinus. It is located 4 degrees below the Galactic plane, and, at a distance of 4.0 Mpc (13 Mly), is one of the closest major galaxies to the Milky Way. [3] The galaxy is undergoing tumultuous changes, as rings of gas are likely being ejected from the galaxy. [4]
Three supernovae have been observed in NGC 5939: . SN 2004ax (type Ib/c, mag. 17.7) was discovered by the Lick Observatory Supernova Search (LOSS) on 21 March 2004.[3] [4] The spectrum indicated this might be a calcium-rich supernova.
This led to successful jamming of several frequency bands of the FuG 220 (I to III, 72, 81 and 90 MHz), and a partial adoption of the use of the low-to-mid VHF band 170 MHz FuG 216 and 217 Neptun radar — which used eight shorter-length dipoles in the same "stag's antlers" layout for its frequency ranges than the SN-2 did — but several other ...
Sodium stannate, formally sodium hexahydroxostannate(IV), is the inorganic compound with the formula Na 2 [Sn(OH) 6].This colourless salt forms upon dissolving metallic tin or tin(IV) oxide in sodium hydroxide and is used as a stabiliser for hydrogen peroxide. [2]
NGC 4375 is a barred spiral galaxy in the constellation of Coma Berenices.Its velocity with respect to the cosmic microwave background is 9325 ± 20 km/s, which corresponds to a Hubble distance of 137.54 ± 9.63 Mpc (~448 million light-years). [1]
Tin-121m (121m Sn) is a radioisotope and nuclear isomer of tin with a half-life of 43.9 years.. In a normal thermal reactor, it has a very low fission product yield; thus, this isotope is not a significant contributor to nuclear waste.