December 1998 ปรากฏการณ์ท้องฟ้า

Observer Location:Beijing (39.904°, 116.407°)

ภาพรวมดาวเคราะห์

24 sky events total, including 4 moon phases and 2 planetary events.

เหตุการณ์ท้องฟ้า

All times are in local time (Asia/Shanghai)

Group วันที่ Sunrise/Sunset Moonrise/Moonset Moon Phase ปรากฏการณ์ท้องฟ้า

Planetary outlook

December 1998 mid-month observing conditions

Mercury

Excellent
Apparent magnitude: -0.1
กลุ่มดาว: Sagittarius
Angular diameter: 7.5"
Status: near greatest eastern elongation

Observation tip: Very bright, easily visible to the naked eye; Mercury stays close to the Sun; best seen at dusk or dawn

Right ascension: 16h03m25s
เดคลิเนชัน: -18°01'13"

Venus

Excellent
Apparent magnitude: -3.9
กลุ่มดาว: Capricornus
Angular diameter: 10.0"
Status: near greatest western elongation

Observation tip: Very bright, easily visible to the naked eye; Venus is the brightest planet and is best seen at dusk or dawn

Right ascension: 18h17m45s
เดคลิเนชัน: -24°10'33"

Mars

Excellent
Apparent magnitude: 1.2
กลุ่มดาว: Libra
Angular diameter: 5.6"
Status: near eastern quadrature

Observation tip: Visible to the naked eye; Its reddish appearance is obvious; it is best observed near opposition

Right ascension: 12h38m12s
เดคลิเนชัน: -02°10'07"

Jupiter

Excellent
Apparent magnitude: -2.4
กลุ่มดาว: Pisces
Angular diameter: 40.1"
Status: near western quadrature

Observation tip: Very bright, easily visible to the naked eye; Its moons are easy to spot and it is excellent for telescope observing

Right ascension: 23h24m36s
เดคลิเนชัน: -05°13'43"

Saturn

Excellent
Apparent magnitude: 0.3
กลุ่มดาว: Aries
Angular diameter: 19.1"
Status: near western quadrature

Observation tip: Visible to the naked eye; Saturn’s rings require a telescope to see clearly

Right ascension: 01h43m54s
เดคลิเนชัน: +07°56'25"

Uranus

Fair
Apparent magnitude: 5.9
กลุ่มดาว: Aquarius
Angular diameter: 3.4"
Status: near western quadrature

Observation tip: Binoculars are recommended; Binoculars or a telescope are recommended

Right ascension: 20h51m03s
เดคลิเนชัน: -18°18'53"

Neptune

Fair
Apparent magnitude: 7.9
กลุ่มดาว: Aquarius
Angular diameter: 2.2"
Status: near western quadrature

Observation tip: A telescope is required; A telescope is required; Neptune appears blue-green

Right ascension: 20h10m27s
เดคลิเนชัน: -19°44'56"

Moon

Excellent
Apparent magnitude: -12.7
กลุ่มดาว: Scorpius
Angular diameter: 11468.2"
Status: Moon illumination 14.0%

Observation tip: Moon illumination 14.0%; good for observing lunar surface detail

Right ascension: 14h33m41s
เดคลิเนชัน: -09°56'09"