Ernst Hartwig
Introduction

[thumb\|200px\|Carl Ernst Albrecht Hartwig](/wiki/File:Carl_Ernst_Albrecht_Hartwig.jpg "Carl Ernst Albrecht Hartwig.jpg")
**Carl Ernst Albrecht Hartwig** (14 January 1851 in [Frankfurt](/wiki/Frankfurt "Frankfurt") – 3 May 1923 in [Bamberg](/wiki/Bamberg "Bamberg")) was a German [astronomer](/wiki/Astronomer "Astronomer").

On 20 August 1885, Hartwig discovered a new star, [SN 1885A](/wiki/SN%C2%A01885A "SN 1885A") (S Andromedae), in the [Andromeda Galaxy](/wiki/Andromeda_Galaxy "Andromeda Galaxy"), which was the first [supernova](/wiki/Supernova "Supernova") that was ever seen that was outside the Milky Way. He is also credited for the discovery and co\-discovery of three [parabolic and hyperbolic comets](/wiki/List_of_hyperbolic_comets "List of hyperbolic comets"), namely [C/1879 Q2](/wiki/C/1879_Q2 "C/1879 Q2"), [C/1880 S1](/wiki/C/1880_S1 "C/1880 S1") and [C/1886 T1](/wiki/C/1886_T1 "C/1886 T1"). In 1882, Hartwig observed the [transit of Venus](/wiki/Transit_of_Venus "Transit of Venus") in Argentina. During the 1883 observation campaign of comet [6P/d'Arrest](/wiki/6P/d%27Arrest "6P/d'Arrest") he found five [NGC](/wiki/New_General_Catalogue "New General Catalogue") objects working at the [Strasbourg Observatory](/wiki/Strasbourg_Observatory "Strasbourg Observatory"). In 1874 he became assistant at the [Observatory of Strasbourg](/wiki/Observatory_of_Strasbourg "Observatory of Strasbourg"), 1884 astronomer at [Dorpat Observatory](/wiki/Dorpat_Observatory "Dorpat Observatory") and 1887 director of the [Remeis Observatory](/wiki/Remeis_Observatory "Remeis Observatory") at Bamberg. 

The [French Academy of Sciences](/wiki/French_Academy_of_Sciences "French Academy of Sciences") awarded him the [Valz Prize](/wiki/Valz_Prize "Valz Prize") in 1902 for his [heliometer](/wiki/Heliometer "Heliometer") observations and work on [variable stars](/wiki/Variable_stars "Variable stars"). Lunar [crater](/wiki/Impact_crater "Impact crater") [*Hartwig*](/wiki/Hartwig_%28lunar_crater%29 "Hartwig (lunar crater)") and Martian crater [*Hartwig*](/wiki/Hartwig_%28Martian_crater%29 "Hartwig (Martian crater)") were both named in his honor.


In which city and country was Carl Ernst Albrecht Hartwig born?