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 Fornalha 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 — Estrela Dupla em Fornalha

HIP 14879; Alpha Fornacis

Estrela Dupla Observável Excelente (60/100)

Sep: 5.5", Companion: mag 7.2

Magnitude 3.9^m DoubleStar Fornalha (For) Visível

Mapa Estelar + Lista + Plano

Sobre Dalim

Descrição

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.

Dicas de Observação

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.

História

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.

Curiosidades

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.

Observar

1Propriedades Físicas

Magnitude 3.87

Tipo Espectral F6V

Cor da Estrela Amarelo (B-V 0.52)

Distância 46 ly

2Posição e Identificadores

RA 03h 12m 04.3s

Dec -28° 59' 13.0"

Constelação Fornalha (For)

HR 963

HIP 14879

HD 20010

SAO 168373

Bayer Alpha

Double Cat 2402

SIMBAD Wikipedia

3Facilidade de separação

Principal 3.9 mag Companheira 7.2 mag Separação 5.5″

Entrar e configure seu equipamento e local padrão para ver uma linha personalizada.

Telescópio	Bortle 3	Bortle 4	Bortle 5
Refrator 80 mm Refr. 80mm	Médio	Médio	Médio
Newton 150 mm Newt. 150mm	Fácil	Fácil	Fácil
Celestron C8 (SCT 203 mm) C8 203mm	Fácil	Fácil	Fácil

Fácil Médio Difícil Muito difícil Impossível

Bortle 3 = rural · 4 = suburbano · 5 = urbano

4Visibilidade

Defina um local nas Configurações do Usuário para ver dados de visibilidade.

Melhor temporada Oct – Dec (peak: Nov)

5Sistema Estelar Múltiplo

Separação 5.5″

Mag da Companheira 7.2

Ângulo de Posição 301°

Cores das Estrelas A: Amarelo B: Laranja

Descobridor HJ 3555

Notas

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

Separação ao longo do tempo

Período: 268.2 y Excentricidade: 0.737 Agora: 5.5", PA 301° + 0.05" em 5 anos

Separação aparente ao longo do tempo, calculada a partir dos elementos orbitais ORB6. Curvas íngremes indicam pares de rápida evolução — observe-os enquanto forem separáveis.