When is the best time to observe Talitha?

Talitha is best observed from December through February, with peak visibility during January when it transits around midnight in the Northern Hemisphere.

Where is Talitha located in the sky?

Talitha lies in the constellation 큰곰 at right ascension 08h 59m and declination +48° 02′.

What telescope do I need to split Talitha?

Splitting Talitha requires an aperture beyond typical amateur scopes — even 500 mm struggles against the primary's glare — the components are separated by about 0.9″ at magnitudes near 3.1. The companion is about 7.0 magnitudes fainter, so glare from the primary — not separation — sets the minimum aperture. Larger apertures and steady seeing help resolve the pair cleanly.

Talitha — 큰곰의 이중성

HIP 44127; Iota Ursae Majoris; 9 Ursae Majoris

등급 3.1^m DoubleStar 큰곰 (UMa) 관측 가능

성도 + 목록 + 계획

Talitha 소개

설명

Talitha, Iota Ursae Majoris, is a quadruple star system lying 47 light-years away in the west of Ursa Major. The primary is an A7V white dwarf of about 1.7 solar masses, orbited distantly by a pair of M-dwarf red-dwarf binaries. Talitha shines at combined magnitude 3.14 and forms one of the three "leaps of the gazelle" asterism with Alkaphrah (Kappa UMa) and Alhaud stars — the marks of the bear's "paws" in classical Arabic astronomy.

관측 팁

Find Talitha west of the main Big Dipper pattern, forming a prominent pair with nearby Kappa UMa (about 0.7 degrees south). Together they make the First Leap of the Gazelle. The bright primary is an easy naked-eye object; the M-dwarf companion binary is around 4 arcseconds out at magnitude 10 — a challenge requiring 10-inch apertures and steady seeing. Circumpolar at mid-northern latitudes.

역사

The name Talitha derives from the Arabic "al-qafzah al-thālithah," meaning "the third leap" (of the gazelle, a pre-Islamic asterism). The IAU adopted "Talitha" specifically for Iota UMa A in 2016. The companion pair was resolved by Otto Struve in the 1840s.

재미있는 사실

The Three Leaps of the Gazelle asterism is one of the oldest recognized patterns in Ursa Major — older than the Big Dipper itself in some traditions. Talitha is one of the few naked-eye A-type stars close enough to have a directly measured angular diameter by optical interferometry. The full four-star system spans about 200 AU at its present epoch.

관측

1물리적 특성

등급 3.14

분광형 A7V(n)

항성 색상 황백색 (B-V 0.19)

거리 47 ly

2위치 & 식별자

RA 08h 59m 12.4s

Dec +48° 02' 30.0"

별자리 큰곰 (UMa)

HR 3569

HIP 44127

HD 76644

SAO 42630

Bayer Iota

Flamsteed 9 UMa

Double Cat 7114

SIMBAD Wikipedia

3분리 난이도

주성 3.1 mag 반성 10.1 mag 이각 0.9″

로그인 하고 장비와 기본 위치를 설정하면 맞춤 행이 표시됩니다.

망원경	보틀 3	보틀 4	보틀 5
80 mm 굴절 80mm 굴절	극난	극난	극난
150 mm 뉴턴 150mm 뉴턴	극난	극난	극난
Celestron C8 (203 mm SCT) C8 203mm	극난	극난	극난

쉬움 보통 어려움 매우 어려움 불가능

보틀 3 = 시골 · 4 = 외곽 · 5 = 교외

보틀 3에서도 일반 아마추어 망원경의 한계를 벗어납니다.

4가시성

사용자 설정에서 관측지를 설정하세요 가시성 데이터를 확인할 수 있습니다.

최적 관측 시기 Dec – Feb (peak: Jan)

5다중 항성계 Quadruple

구성 항성 4 (quadruple)

구성 ID AB

이격 0.9″

동반성 등급 10.1

위치각 206°

항성 색상 A: 황백색

발견자 HU 628

메모

BC 10.8, 11.0, 39.69y, a = 0.68". BC is dM1. BCxA: 817.91y, a = 9.092". Separation rapidly decreasing. ADS 7114Aa, | 11.02y, a = 90.354". This is the SB pair.