The Moon and the stars — October 2027

Lunar occultations of stars to magnitude 9.5, computed for your location

Every night the Moon slides in front of stars. A star doesn't fade behind it — it switches off, then switches back on at the other edge, often an hour later. Pick your place and what you observe with; the list keeps what you can realistically see.

Naked eye Binoculars Small telescope (80 mm) Telescope (200 mm)

32 occultations you can see from New Delhi with small telescope (80 mm) this month, on 15 nights · 1161 in all from there

Mon

Tue

Wed

Thu

Fri

Sat

Sun

3 8

1 9

2 10

1 11

4 18

1 19

2 20

2 21

4 22

2 23

Times in IST. A night runs from noon to noon, so an event at 01:30 stays with the evening before. On each Moon, the numbered marks show where on the limb each star disappears or reappears.

Night of Tue 5 Oct

1
18:50:23 HIP 84297 V 6.7
Disappears at the dark limb
26° up in the SSW · dusk · PA 142° · cusp 44°
2
20:05:10 HIP 84497 V 8.2
Disappears at the dark limb
16° up in the SW · dark sky · PA 99° · cusp 87°

Night of Thu 7 Oct

1
19:36:58 HIP 93691 V 7.1
Disappears at the dark limb
33° up in the SSW · dark sky · PA 46° · cusp 53°
2
21:35:27 TYC 6878-898-1 V 8.1
Disappears at the dark limb
20° up in the SW · dark sky · PA 20° · cusp 27°
3
22:12:20 HIP 94045 V 6.9
Disappears at the dark limb
14° up in the SW · dark sky · PA 106° · cusp 68°

Night of Fri 8 Oct

1
22:20:44 Gaia …2010496 V 6.8
Disappears at the dark limb
22° up in the SW · dark sky · PA 114° · cusp 54°

Night of Sat 9 Oct

1
22:48:57 HIP 102685 V 7.2
Disappears at the dark limb
28° up in the SW · dark sky · PA 84° · cusp 81°
2
23:29:25 HR 7964 V 6.2
Disappears at the dark limb
21° up in the SW · dark sky · PA 80° · cusp 84°

Night of Sun 10 Oct

1
19:21:53 HIP 106199 V 6.6
Disappears at the dark limb
43° up in the SSE · dark sky · PA 55° · cusp 73°

Night of Mon 11 Oct

1
20:36:41 HR 8500 V 5.8
Disappears at the dark limb
51° up in the SSE · dark sky · PA 59° · cusp 79°

Night of Thu 14 Oct

1
04:39:47 HIP 3236 V 6.5
Disappears at the dark limb
15° up in the W · dark sky · PA 63° · cusp 57°

Night of Sun 17 Oct

1
19:34:19 HIP 13892 V 6.8
Reappears at the dark limb
9° up in the ENE · dark sky · PA 295° · cusp 40°
2
19:34:19 HIP 13892 V 6.8
Reappears at the dark limb
9° up in the ENE · dark sky · PA 295° · cusp 40°
3
19:37:20 ε Ari V 5.2
Reappears at the dark limb
10° up in the ENE · dark sky · PA 226° · cusp 72°
4
04:50:34 HIP 15072 V 6.8
Reappears at the dark limb
50° up in the W · dark sky · PA 245° · cusp 89°

Night of Mon 18 Oct

1
20:11:25 HR 1222 V 6.2
Reappears at the dark limb
7° up in the ENE · dark sky · PA 247° · cusp 84°

Night of Tue 19 Oct

1
23:42:58 HIP 23712 V 6.6
Reappears at the dark limb
38° up in the ENE · dark sky · PA 261° · cusp 88°
2
02:53:41 HIP 24252 V 6.8
Reappears at the dark limb
79° up in the E · dark sky · PA 199° · cusp 27°

Night of Wed 20 Oct

1
01:01:19 TYC 1881-1526-1 V 7.5
Reappears at the dark limb
42° up in the E · dark sky · PA 239° · cusp 59°
2
01:01:19 TYC 1881-1526-2 V 7.5
Reappears at the dark limb
42° up in the E · dark sky · PA 239° · cusp 59°

Night of Thu 21 Oct

1
00:15:18 HIP 34640 V 7.9
Reappears at the dark limb
20° up in the ENE · dark sky · PA 280° · cusp 86°
2
01:06:06 48 Gem V 5.8
Reappears at the dark limb
30° up in the ENE · dark sky · PA 291° · cusp 76°
3
02:38:45 HIP 35099 V 7.9
Reappears at the dark limb
50° up in the E · dark sky · PA 248° · cusp 60°
4
03:19:24 TYC 1909-901-1 V 8.0
Reappears at the dark limb
58° up in the E · dark sky · PA 263° · cusp 76°

Night of Fri 22 Oct

1
01:56:43 HIP 40270 V 7.8
Reappears at the dark limb
27° up in the E · dark sky · PA 261° · cusp 68°
2
02:59:39 TYC 1385-1113-1 V 7.9
Reappears at the dark limb
41° up in the E · dark sky · PA 276° · cusp 83°

Night of Sat 23 Oct

1
01:58:30 HIP 44985 V 8.4
Reappears at the dark limb
14° up in the E · dark sky · PA 272° · cusp 75°
2
02:09:21 HIP 45043 V 8.5
Reappears at the dark limb
17° up in the E · dark sky · PA 311° · cusp 65°
3
03:46:17 π2 Cnc V 5.4
Disappears at the bright limb · reappears 04:56:51 at the dark limb
37° up in the E · dark sky · PA 134° · cusp 63°
4
05:14:58 HIP 45462 V 7.8
Reappears at the dark limb
56° up in the ESE · dark sky · PA 305° · cusp 73°

Night of Tue 26 Oct

1
05:25:26 HIP 57972 V 8.1
Reappears at the dark limb
17° up in the ESE · dark sky · PA 269° · cusp 71°
2
05:33:58 HIP 58007 V 7.4
Reappears at the dark limb
19° up in the ESE · dark sky · PA 301° · cusp 76°

Reading the list

The Moons are drawn from LRO LOLA topography (a 40 KB relief map), lit by the Sun as it is at that moment and turned to the Moon's real libration: north up, east to the left. A dark-limb event — the star vanishing into, or popping out of, the unlit edge of the Moon — is easy to see. At the bright limb only bright stars show against the glare. PA is where on the limb it happens, measured from north through east; the cusp angle is the distance from the nearest horn of the crescent. graze marks a star passing within 3″ of the edge from your place: a few kilometres from a graze line, where it may blink several times behind mountains.

Instrument	dark limb	bright limb
Naked eye	V ≤ 3.0	V ≤ 1.0
Binoculars	V ≤ 6.5	V ≤ 3.5
Small telescope (80 mm)	V ≤ 8.5	V ≤ 5.5
Telescope (200 mm)	V ≤ 9.5	V ≤ 7.0

Those limits are rules of thumb: the dark-limb limit drops by 2.5 magnitudes × (lit fraction − 0.4) in moonglare and by 1 in twilight; events with the Moon under 5° are left out, and daylight events except for the brightest stars. Stars are from Gaia DR3 to G 9.5, with Hipparcos-2 for the brightest and the Yale Bright Star Catalogue for names; the Moon is from the JPL DE431 ephemeris. Times are for the Moon's mean limb, ±2 s — mountains at the edge can move a contact by a few seconds, and much more near a graze.