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 Balena 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 — Stella doppia in Balena

HIP 12706; Gamma Ceti; 86 Ceti

Stella doppia osservabile Discreto (28/100)

Sep: 1.8", Companion: mag 6.2

Magnitudine 3.5^m DoubleStar Balena (Cet) Visibile

Mappa stellare + Lista + Piano

Su Kaffaljidhma

Descrizione

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.

Consigli per l'osservazione

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.

Storia

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.

Curiosità

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.

Osservare

1Proprietà fisiche

Magnitudine 3.47

Tipo spettrale A2Vn

Colore della stella Bianco (B-V 0.09)

Distanza 80 ly

2Posizione e identificatori

RA 02h 43m 18.0s

Dec +03° 14' 09.0"

Costellazione Balena (Cet)

HR 804

HIP 12706

HD 16970

SAO 110707

Bayer Gamma

Flamsteed 86 Cet

Double Cat 2080

SIMBAD Wikipedia

3Facilità di separazione

Principale 3.5 mag Compagna 6.2 mag Separazione 1.8″

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	M. diff.+	M. diff.+	M. diff.+
Newton 150 mm Newt. 150mm	Diff.+	Diff.+	Diff.+
Celestron C8 (SCT 203 mm) C8 203mm	Medio	Medio	Medio

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 Sep – Nov (peak: Oct)

5Sistema stellare multiplo Triple

Componenti 3 (triple)

ID componenti AB

Separazione 1.8″

Mag compagna 6.2

Sp compagna F4V

Angolo di posizione 299°

Colori delle stelle A: Bianco B: Bianco-giallo

Scopritore STF 299

Note

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

Separazione nel tempo

Periodo: 914.0 y Eccentricità: 0.900 Ora: 1.8", PA 300° -0.24" in 5 anni

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