Author: J. Schenker, Schweizerische Astronomische Gesellschaft (SAG) http://www.sag-sas.ch
Call for Observation during October 2021
1.) Minorplanets: Observable objects with apparent brightness < 10 mag
Asteroid Brightness Brightness
(Ephemeris) begin of month end of month
(1) Ceres 8.4 Taurus 7.8
(2) Pallas 8.9 Aquarius 9.4
(6) Hebe 9.6 Sagitt. - Capricorn. 9.9
(7) Iris 9.5 Gemini 9.1
(40) Harmonia 9.5 Cetus >10.0
(89) Julia 9.8 Aquarius >10.0
(25) Phocaea 10.1 Pisces 10.5
2.) Minorplanets: Close encounters with astronomical objects
Date Time UT
[hh:mm]
Asteroid
(Ephemeris)
m (ast)
[mag]
Distance
[ ' ]
Polar angle
[]
Object m (obj)
[mag]
Position (J2000)
Ra

Dec
01.10.2021 20:00 (2) Pallas 8.9 7.5 305 HIP 113184 5.7 22h 55m 12s -04 59'
10.10.2021 04:00 (25) Phocaea 10.3 3.5 303 HIP 7359 5.9 01h 34m 48s +18 28'
11.10.2021 03:30 (796) Sarita 11.6 6.5 64 27 Tau 3.6 03h 49m 12s +24 03'
11.10.2021 04:00 (796) Sarita 11.6 5.5 111 28 Tau 5.1 03h 49m 12s +24 08'
15.10.2021 04:00 (377) Campania 12.1 7.5 125 Hip 5534 7.7 01h 10m 54s +09 34'
18.10.2021 03:05 (20) Massalia 10.9 4.5 15 ϑ Cnc 5.3 08h 31m 36s +18 06'
21.10.2021 19:00 (3) Juno 11.3 9.0 66 HIP 85397 6.2 17h 27m 00s -12 31'
23.10.2021 18:25 (354) Eleonora 12.2 2.0 188 57 Sgr 5.9 19h 52m 12s -19 03'
26.10.2021 20:00 (6) Hebe 9.9 6.0 256 HIP 98575 6.0 20h 01m 24s -22 44'
3.) Minorplanets: Close approaches by near-Earth objects with min. distance < 10 Lunar Distances LD
Date Time UT
[hh:mm]
Asteroid
(Ephemeris)
Min. distance
[LD]
rel. speed
[km/s]
Diameter
[m]
04.10.2021 00:22 2021 SV1 6.77 5.39 18 - 41
05.10.2021 00:18 2021 SE1 8.55 4.27 15 - 33
06.10.2021 01:58 2021 ST 5.98 9.08 18 - 39
06.10.2021 05:35 2021 RP12 4.98 9.65 31 - 70
12.10.2021 00:44 2021 SF1 6.20 3.38 9.2 - 21
14.10.2021 16:23 2021 SM1 6.78 7.23 21 - 46
19.10.2021 05:07 2020 TH6 7.25 5.86 5 - 10
20.10.2021 18:52 1996 VB3 8.75 15.32 100 - 230
26.10.2021 12:16 2019 UW6 7.82 11.11 13 - 28
09.11.2021 03:48 2019 XS 1.49 10.68 48 - 110
15.11.2021 03:40 2016 VR 6.80 8.74 15 - 34
15.11.2021 11:38 2010 VK139 5.07 13.94 45 - 65
15.11.2021 19:56 2019 VL5 8.43 8.02 18 - 39
29.12.2021 01:54 2017 AE3 8.36 19.08 120 - 260
07.01.2022 17:32 2020 AP1 0.003 5.65 3.2 - 7.1
4.) Minorplanets: Close approaches (< 0.1 AU) by near-Earth objects with absolute brightness < 20 mag
Date Time UT
[hh:mm]
Asteroid
(Ephemeris)
Min. distance
[LD]
rel. speed
[km/s]
Diameter
[m]
11.09.2021 08:35 2011 YQ10 35.84 6.65 440 - 990
13.09.2021 11:05 2021 MG1 22.02 17.26 590 - 1300
15.09.2021 12:42 2001 EC 31.72 19.03 530 - 1200
17.09.2021 11:34 1991 TF3 33.97 14.19 370 - 840
23.09.2021 23:04 2003 QQ47 38.34 30.23 880 - 2000
5.) Comets:
Brightness
[mag]
Constellation
Short periodic comets:
4P/Faye 11.0 Orion - Gemini
67P/Tschurjumow-Gerasimenko 9.5 - 9.0 Taurus - Gemini
132P/Helin-Roman-Alu 13.0 Pisces
Long or not periodic comets:
C/2017 K2 (PANSTARRS) 12.0 Hercules
C/2019 L3 (ATLAS) 10.5 Lynx
C/2021 A1 (Leonard) 13.0 Ursa Major
(Sources: CNEOS MPC JPL )