GoodSeeing
Home › Locations › Bontang

Bontang

0.132° N   117.485° E  ·  10 M
57 /100
PEAK
Worth setting up — 3 hours of workable sky from 03:00.
BEST WINDOW 03:00–06:00 · ASTRO DARK 02:00–06:00 · MOON 0%
Transparency
0.24
Seeing
0.89
Cloud
15%
Moon
0%

Good tonight

Hour by hour, local to Bontang. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
02
03
04
05
06
31
37
39
57
0
BEST WINDOW
Low cloud
5%
2%
7%
13%
0%
Mid cloud
6%
2%
1%
1%
0%
High cloud
88%
77%
66%
2%
11%
Transparency
0.24
0.24
0.23
0.22
0.21
Seeing
0.82
0.80
0.84
0.89
0.90
Moon clear
down
down
down
down
down
Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Why this hour scored what it did
02 Poor · 31/100
Starting from
100
Cloud
−53
Transparency
−14
Seeing
−1
Moonlight
−0
Darkness
−0
Score
31
CLOUD 89% LOW 5% MID 6% HIGH 88% SUN -60.1° MOON -61.2° / 0% WIND 4 TEMP 25°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.
Tonight's limiting factor
Why thin high cloud ruins long exposures

Cirrus you can barely see will halo your bright stars, lift your background and vary between frames. Visual observers shrug it off. Long exposures integrate it, so it accumulates.

What are you doing tonight?

The same forecast, weighted for the target. Planetary work barely cares about moonlight; long exposures die on high cloud a visual observer would never notice.

SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 43

Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.

020406
TWILIGHT BEGINS 06:00
SET UP 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 51

Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.

020406
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 04:30 · OBSERVE 05:00–06:00 · 1H · MEAN 54

Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.

020406
HIGH CLOUD CLEARS 05:00TWILIGHT BEGINS 06:00
SET UP 04:30 · OBSERVE 05:00–06:00 · 1H · MEAN 43

Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.

020406
HIGH CLOUD CLEARS 05:00TWILIGHT BEGINS 06:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 49

Naked eye, whole sky. Total cloud and moonlight are the only things that count.

020406
TWILIGHT BEGINS 06:00
Advertisement
Reserved

The next week of nights

Tonight · 12 Aug
57
Good
MOON 0%
03:00–06:00
Tomorrow · 13 Aug
64
Good
MOON 1%
20:00–06:00
Friday · 14 Aug
49
Fair
MOON 5%
20:00–00:00
Saturday · 15 Aug
32
Poor
MOON 10%
Sunday · 16 Aug
32
Poor
MOON 19%
Monday · 17 Aug
33
Poor
MOON 28%
Tuesday · 18 Aug
32
Poor
MOON 37%
Advertisement
Reserved

Nearby locations

About this forecast

Conditions for Bontang, Indonesia are computed from the MET Norway forecast model for these exact coordinates, combined with sun and moon positions we calculate directly. The score weighs cloud cover by layer, atmospheric transparency, estimated seeing, moonlight and how dark the sky actually gets. Read the full method →