沙鹿的星空

[yao]

有時候天文器材還是要先搶先贏(Explore Scientific 9mm 120°)

Following is adopted from CN review, binoculars forum.

It seems the first batch (serial # 1-20) had a wider AFOV of ~140°.
The remainder (serial # > #20) have a AFOV of 120° (due to installed field stop).
Compared to a 9mm 100° eyepiece (APM, ES, etc) there is quite a difference in TFOV (true field of view).
The original AFOV 140° version has 1.96X the TFOV.
The current AFOV 120° version has 1.44X the TFOV.
The AFOV 140° version has 1.36X the TFOV of the current AFOV 120° versions.

However, the owners of this specific version would know this and not be willing to part with their eyepiece.

[yao]

ε Lyrae雙雙星。
也是在天琴座。
非常好找，又亮。
下次拿折射鏡試試看最低分解的倍率。
20x70之類當然能分出double，不能分出double double。

Epsilon (ε) Lyrae。
RA: 18h 44.3m
Dec: +39° 40′
Epsilon-1/AB (Σ 2382) (H II 5) HIP: 91919 SAO: 67309
Magnitudes: 5.15, 6.10
Separation: 2.3″
Position Angle: 346° (WDS 2013)
Spectral Type: “A” is A3, “B” is F0
Distance: 162 Light Years (Simbad)

Epsilon-2/CD (Σ 2383) (H II 6) HIP: 91926 SAO: 67315
Magnitudes: 5.25, 5.38
Separation: 2.4″
Position Angle: 78° (WDS 2013)
Spectral Type: “C” is A^, “D” is F7
Distance: 160 Light Years (Simbad)

[yao]

雙雙星。
Struve (Σ) 2470與Struve (Σ) 2474
也是在天琴座。
TS兄看過多次。
下次拿折射鏡試試看。

Struve (Σ) 2470 HIP: 94043 SAO: 67870
RA: 19h 8.8m Dec: +34° 46′
Magnitudes: 7.03, 8.44
Separation: 13.9″
Position Angle: 267° (WDS 2013)
Spectral Type: B5
Distance: 1320 Light Years
Status: Not determined

Struve (Σ) 2474 HIP: 94076 SAO: 67879
RA: 19h 9.1m Dec: +34° 36′
Magnitudes AB: 6.78, 7.88 AC: 6.78, 11.42
Separation AB: 15.9″ AC: 96.80″
Position Angle AB: 263° (WDS 2013) AC: 123° (1998)
Spectral Type: “A” is G1, “B” is G5
Distance: 160 Light Years
Status: Physically related (WDS, codes U & Z); AC is WAL 105
(WDS data updated 10/6/2014)

[yao]

補圖

[yao]

天蠍座雙雙星
下次拿折射鏡看看

Xi [ξ] Scorpii (Σ 1998) (AB is H I 33, AC is H II 20) HIP: 78727 SAO: 159665
RA: 16h 04.4m Dec: -11° 22′
Magnitudes AB: 5.2, 4.9 AC: 5.2, 7.3
Separation AB: 0.99″ AC:7.6″
Position Angle AB: 359° (WDS 2010) AC: 44° (WDS 2009)
Distance: 79 Light Years
Spectral Classification: F7
Status: AB gravitationally linked, orbit in can be seen here

Σ 1999 (AB is H II 21) HIP: 78738 (A), 78739 (B) SAO: 159668
RA: 16h 04.4m Dec: – 11° 27′
Magnitudes AB: 7.5, 8.1 AC: 7.5, 11.0 AD: 7.5, 4.4
Separation AB: 13.3″ AC: 83.1″ AD: 278.5″
Position Angles AB: 101° (WDS 2009) AC: 84° (WDS 1999) AD: 351° (WDS 2006)
Distance: 82 Light Years
Spectral Classification: K0
Status: AB is physical, AC is optical; “D” is the AB pair of Σ 1998 and is physical

Σ 1998 is the brighter pair (“A” and “C”) just above and to the left of center in this sketch, and the fainter pair below and slightly to the right of center is Σ 1999. It’s “C” component is flickering faintly just to the east (right). The 4.9 magnitude “B” component of Σ 1998, at a very unreasonable proximity of 0.99″, isn’t seen in this sketch, which is because it has proven to be beyond the author reach so far. (East & west reversed to match the refractor view, click for a closer look).

[yao]

蛇夫座61(61 Ophinchus)

之前天氣不好時看的

方式: 手持。

器材: Apm 20x70 ed。

尋找難易度: 10%(找到蛇夫座alpha, 再到beta, 再到gamma。gamma的右下方)。

分解難易度: 15%。(21角秒間距)

好看度: 75%

顏色: 6.1等主星與6.4等伴星亮度有些微差距的同時(絕對看的出來)。兩顆星仍然有些許的顏色差距(約5%的顏色差距)。

補充:圖是80倍牛頓下的61 Ophinchus。其實20倍手持下的分解狀態與圖極像。

[yao]

松本龍郎說
Recently, I have come to concentrate on making the EMS itself and do not accept the order of making a total binoscope.

所以搞松本雙筒的方法剩
2047天文工作室
aowswiss
北旅論壇收一只二手松本雙筒
買現成的例如WO 126 Binoscope