NGC 4426

NGC 4426 is a double star in the constellation Haar der Berenike . It is identical to the following entry in the New General Catalog , NGC 4427. It is listed under the number GC 5649 in the General Catalog of Nebulae and Clusters . Its position is 12h 27m 10.5s ( σ = 0.75 "), + 27 ° 50 '18.40" (σ = 1.27 ") ( J2000.0 ).

discovery

NGC 4426 was discovered in 1865 by Heinrich Louis d'Arrest using an 11-inch refractor telescope at the position 12h 20m 10s, 61 ° 23.3 '( B1860.0 ), with an annual precession of 3.01s in right ascension and 20, 0 "in declination (both for 1880). The properties are described as" Cl, F, S "( cluster, faint, small , in English: heap , weak, small).

In 1886 Guillaume Bigourdan observed it using a 12-inch refractor. In the original edition of NGC, his observation can be found as NGC 4427 with almost identical coordinates (12h 20m 10s, 61 ° 23 ', annual precession: 3.01s or 20.0 "). In this case the properties were described as“ vF ,? 2 or 3 st in neb ”( very faint, probably 2 or 3 stars in nebula , in English: very weak, possibly 2 or 3 stars in nebula ).

Creation of the incorrect entry

Although the position and properties of the objects described were the same in both cases, Johan Dreyer entered them as different objects with consecutive numbers when compiling the New General Catalog. However, he noticed the obvious identity after seeing the proofs and added a comment to that effect.

The mistake is mainly attributed to the haste Dreyer probably displayed in the final phase of creating the NGC. Bigourdan also has an error, an incorrect position for a comparison star near BD + 28 ° 2116.

Further additions

Another note can be found later in IC II : There Dreyer noticed that, according to Max Wolf, there are only two stars that are 36 arc seconds apart. In fact, it's 13 to 14 arc seconds. There was possibly a defect on Wolf's photo plate.

Individual evidence

^ NED
↑ ^a ^b ^c ^d ^e database of NGC / IC objects ( Memento of the original from May 28, 2009 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (in English) @1@ 2

↑ NGC 4426 at VizieR (in English)

↑ ^a ^b With the declination information it should be noted that the information, in contrast to today, relates to the distance from the north celestial pole.

↑ ^a ^b page from the original NGC by Johan Dreyer (in English)

↑ The page on NGC 4426 at The NGC / IC Project speaks of "few objects" in which this haste came to light. According to Dr. Wolfgang Steinecke (NGC doubles. In: Sterne und Weltraum . Edition 08/2009, p. 8.) the number of multiple entries in the NGC is greater than is commonly assumed: 237 double and 16 triple entries, a good three percent of all Entries.

[1] NED

[NGCICDBNGC4426-2] ↑ ^a ^b ^c ^d ^e database of NGC / IC objects ( Memento of the original from May 28, 2009 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (in English) @1@ 2

[VizRNGC4426-3] NGC 4426 at VizieR (in English)

[DeklNGCOrig-4] With the declination information it should be noted that the information, in contrast to today, relates to the distance from the north celestial pole.

[NGCICDBOrig4398-5] rom the original NGC by Johan Dreyer (in English)

[SuW200908008NGC-6] The page on NGC 4426 at The NGC / IC Project speaks of "few objects" in which this haste came to light. According to Dr. Wolfgang Steinecke (NGC doubles. In: Sterne und Weltraum . Edition 08/2009, p. 8.) the number of multiple entries in the NGC is greater than is commonly assumed: 237 double and 16 triple entries, a good three percent of all Entries.