Hemisphere:  Northern
DG 41 (GN 04.32.08, Magakian 77), HH 434,435,436,.. The forgotten areas of Taurus..., 



    
        

            Antonio F. Sánchez
DG 41 (GN 04.32.08, Magakian 77), HH 434,435,436,.. The forgotten areas of Taurus...
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Technical card

Imaging telescopes or lenses: ASA N12 astrograph

Imaging cameras: FLI ML8300

Mounts: ASA DDM85 S-XL

Software: ASA Autoslew, Sequence...

Filters: Optec 50mm B  ·  Optec 50mm G  ·  Optec 50mm R  ·  Optec 50mm L

Accessory: FLI CFW-2-7 50mm round 7 position filter wheel


Dates:Oct. 12, 2015Oct. 15, 2015Nov. 13, 2015Nov. 15, 2015

Frames:
Optec 50mm B: 29x600" bin 1x1
Optec 50mm G: 25x600" bin 1x1
Optec 50mm L: 54x600" bin 1x1
Optec 50mm R: 27x600" bin 1x1

Integration: 22.5 hours

Avg. Moon age: 9.14 days

Avg. Moon phase: 5.65%

Bortle Dark-Sky Scale: 2.00


Basic astrometry details

Astrometry.net job: 863181

RA center: 4h 35' 51"

DEC center: +22° 54' 18"

Pixel scale: 1.518 arcsec/pixel

Orientation: -177.732 degrees

Field radius: 0.583 degrees


Resolution: 620x472

Description

DG 41 (also named GN 04.32.08, Magakian 77, Bernes 83) is a reflection nebula embbeded into a cloud of dust,close to LDN 1536, into the Taurus constellation. Central star is a variable T tauri ( V* V1025 Tau ),also know as CoKu (Cohen+Kuhi) HP Tau G2.Close to it is CoKu HP Tau G3 -- Young Stellar Object..

The best fit yields a distance of 161.2±0.9 pc, suggesting that the eastern portion of Taurus (where HP Tau/G2 is located) corresponds to the far side of the complex.
Magakian 77 is classified as a cometary Nebula into the Magakian catalog.

The whole of the Taurus region (a total area of 52 deg2) has been observed by the Herschel Spectral and Photometric Imaging Receiver (SPIRE) and Photodetector Array Camera and Spectrometer (PACS) instruments at wavelengths of 70, 160, 250, 350 and 500µm as part of the Herschel Gould Belt Survey.

(At the upper right side, over the star TYC 1829:747) While carrying out a wide-field survey of nearby star-forming regions for Herbig-Haro (HH) objects three Herbig-Haro objects were discovered in 2001:, HH 434-436, in a ~2'x2' (0.08x0.08 pc) region near LDN 1536. HH 434 consists of three knots. HH 435 shows a bow shock shape, and HH 436 is an elongated patch. Spectroscopic observations indicate that the excitation levels of HH 434-436 are different: HH 436 has a high excitation level, while 434A has an intermediate, and 435 has a low excitation level. The overall morphology of HH 434-436 shows a bow shock shape and suggests that HH 434-436 may be a single bow shock fragmented into separate knots.

Compiled/resumed by Antonio F.Sánchez. Many thanks to Mr. Sakib Rasool for suggesting me to image this area.

Bibliography:

Dorschner & Gürtler (1963)
Untersuchungen uber Reflexionsnebel.

Struve & Straka (1962)
Notes on diffuse galactic nebulae.

Magakian T. Yu. (2003)

VLBA determination of the distance to nearby star-forming regions. III. HP TAU/G2 and the three-dimensional structure of Taurus.
TORRES R.M.; LOINARD L.; MIODUSZEWSKI A.J.; RODRIGUEZ L.F.

Herbig-Haro objects HH 434-436: part of a giant flow driven by the central source A/B of IRAS 04325+2402?
WANG H.; YANG J.; WANG M.; DENG L.; YAN J.; CHEN J.

Deep imaging surveys of star-forming clouds. V. New Herbig-Haro shocks and giant outflows in Taurus.
BALLY J.; WALAWENDER J.; REIPURTH B.

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Antonio F. Sánchez
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DG 41 (GN 04.32.08, Magakian 77), HH 434,435,436,.. The forgotten areas of Taurus..., 



    
        

            Antonio F. Sánchez