When is the best time to observe Kaffaljidhma?

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

Where is Kaffaljidhma located in the sky?

Kaffaljidhma lies in the constellation Baleia at right ascension 02h 43m and declination +03° 14′.

What telescope do I need to split Kaffaljidhma?

Splitting Kaffaljidhma requires an aperture of roughly 150 mm or larger — the components are separated by about 1.8″ at magnitudes near 3.5. Larger apertures and steady seeing help resolve the pair cleanly.

Kaffaljidhma — Estrela Dupla em Baleia

HIP 12706; Gamma Ceti; 86 Ceti

Estrela Dupla Observável Razoável (28/100)

Sep: 1.8", Companion: mag 6.2

Magnitude 3.5^m DoubleStar Baleia (Cet) Visível

Mapa Estelar + Lista + Plano

Sobre Kaffaljidhma

Descrição

Kaffaljidhma, Gamma Ceti, is a wide triple-star system about 80 light-years away. The brightest component is an A2 Vn main-sequence star at magnitude 3.47. The second component, at 2.6 arcseconds separation, is an F3 dwarf at magnitude 6.6. A third distant member rounds out the system. Kaffaljidhma's physical properties make it a typical young A-type dwarf with a close F-type companion.

Dicas de Observação

Kaffaljidhma is one of the finest double stars in Cetus. A 3-inch telescope at 150x cleanly splits the 2.6-arcsecond pair. The color contrast between the white primary and the warm yellow companion is very pleasing. Kaffaljidhma lies near the head of Cetus, close to the neighboring Pisces boundary. Best observed October through February.

História

The name Kaffaljidhma comes from the Arabic "kaff al-jidhmā'," meaning "the cut-off hand" — a reference to the hand of the Roman goddess Ceres in mythology. The IAU adopted the name in 2016. The double nature was noted by William Herschel in 1780.

Curiosidades

Kaffaljidhma's primary is a young star, only about 800 million years old — one of the younger stars of its spectral type in the nearby galaxy. The system's small angular size allowed rapid orbital motion to be detected: the F-type companion has completed substantial arc of its orbit since Herschel's first measurements.

Observar

1Propriedades Físicas

Magnitude 3.47

Tipo Espectral A2Vn

Cor da Estrela Branco (B-V 0.09)

Distância 80 ly

2Posição e Identificadores

RA 02h 43m 18.0s

Dec +03° 14' 09.0"

Constelação Baleia (Cet)

HR 804

HIP 12706

HD 16970

SAO 110707

Bayer Gamma

Flamsteed 86 Cet

Double Cat 2080

SIMBAD Wikipedia

3Facilidade de separação

Principal 3.5 mag Companheira 6.2 mag Separação 1.8″

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	M. dif.+	M. dif.+	M. dif.+
Newton 150 mm Newt. 150mm	Difícil+	Difícil+	Difícil+
Celestron C8 (SCT 203 mm) C8 203mm	Médio	Médio	Médio

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 Sep – Nov (peak: Oct)

5Sistema Estelar Múltiplo Triple

Componentes 3 (triple)

IDs dos Componentes AB

Separação 1.8″

Mag da Companheira 6.2

Espectro da Companheira F4V

Ângulo de Posição 299°

Cores das Estrelas A: Branco B: Amarelo-branco

Descobridor STF 299

Notas

AB binary, combined mag., colors. CPM with BD+2d418, 10.2v M6 at 840".

Separação ao longo do tempo

Período: 914.0 y Excentricidade: 0.900 Agora: 1.8", PA 300° -0.24" 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.