When is the best time to observe Dalim?

Dalim is best observed from October through December, with peak visibility during November when it transits around midnight in the Northern Hemisphere.

Where is Dalim located in the sky?

Dalim lies in the constellation Fornace at right ascension 03h 12m and declination -28° 59′.

What telescope do I need to split Dalim?

Splitting Dalim requires an aperture of roughly 80 mm or larger — the components are separated by about 5.5″ at magnitudes near 3.9. The companion is about 3.3 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Dalim — Stella doppia in Fornace

HIP 14879; Alpha Fornacis

Stella doppia osservabile Eccellente (60/100)

Sep: 5.5", Companion: mag 7.2

Magnitudine 3.9^m DoubleStar Fornace (For) Visibile

Mappa stellare + Lista + Piano

Su Dalim

Descrizione

Dalim, Alpha Fornacis, is the brightest star in the faint southern constellation Fornax. It is an F-type subgiant of spectral class F6 V about 46.4 light-years away — a relatively nearby bright star. Dalim is a close visual binary, with a magnitude 7 companion orbiting every 269 years at a current separation of 5 arcseconds. Combined system magnitude is 3.87.

Consigli per l'osservazione

Dalim lies in southern Fornax, an inconspicuous constellation south of Eridanus. Despite being the constellation's alpha star, Fornax is so faint overall that Dalim is sometimes overlooked. The 5-arcsecond double is a lovely pair in a 3-inch scope at 100x. Best observed October through February.

Storia

The name Dalim was proposed and adopted by the IAU in 2017. Its etymology is somewhat uncertain but is believed to derive from a medieval Arabic source for this region.

Curiosità

Fornax is one of several 18th-century "furnace" constellations — along with Antlia (the air pump), Reticulum (the reticle), and Microscopium — created by Nicolas-Louis de Lacaille to fill gaps in the southern sky with scientific-instrument themes. Dalim's modest brightness reflects the general lack of bright stars in these Lacaille constellations.

Osservare

1Proprietà fisiche

Magnitudine 3.87

Tipo spettrale F6V

Colore della stella Giallo (B-V 0.52)

Distanza 46 ly

2Posizione e identificatori

RA 03h 12m 04.3s

Dec -28° 59' 13.0"

Costellazione Fornace (For)

HR 963

HIP 14879

HD 20010

SAO 168373

Bayer Alpha

Double Cat 2402

SIMBAD Wikipedia

3Facilità di separazione

Principale 3.9 mag Compagna 7.2 mag Separazione 5.5″

Accedi e configura la tua attrezzatura e località predefinita per vedere una riga personalizzata.

Telescopio	Bortle 3	Bortle 4	Bortle 5
Rifrattore 80 mm Rifr. 80mm	Medio	Medio	Medio
Newton 150 mm Newt. 150mm	Facile	Facile	Facile
Celestron C8 (SCT 203 mm) C8 203mm	Facile	Facile	Facile

Facile Medio Difficile Molto difficile Impossibile

Bortle 3 = rurale · 4 = periferia · 5 = suburbano

4Visibilità

Imposta una località nelle impostazioni per vedere i dati di visibilità.

Periodo migliore Oct – Dec (peak: Nov)

5Sistema stellare multiplo

Separazione 5.5″

Mag compagna 7.2

Angolo di posizione 301°

Colori delle stelle A: Giallo B: Arancione

Scopritore HJ 3555

Note

3.9 F8IV, 6.5 G7V, 314y, a = 4.367". Combined mag., colors.

Separazione nel tempo

Periodo: 268.2 y Eccentricità: 0.737 Ora: 5.5", PA 301° + 0.05" in 5 anni

Distanza apparente nel tempo, calcolata dagli elementi orbitali ORB6. Curve ripide indicano coppie in rapida evoluzione — osservatele finché sono separabili.