Author: J. Schenker, Schweizerische Astronomische Gesellschaft (SAG) http://www.sag-sas.ch
Call for Observation during September 2021
1.) Minorplanets: Observable objects with apparent brightness < 10 mag
Asteroid Brightness Brightness Ephemeris
begin of month end of month
(1) Ceres 8.9 8.5 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=1
(2) Pallas 8.8 8.9 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2
(6) Hebe 9.1 9.6 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=6
(7) Iris 9.7 9.5 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=7
(12) Victoria 9.5 > 10.0 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=12
(40) Harmonia > 10.0 9.5 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=40
(43) Ariadne 9.9 > 10.0 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=43
(89) Julia 9.1 9.8 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=89
2.) Minorplanets: Close encounters with astronomical objects
Date Time UT
[hh:mm]
Asteroid m (ast)
[mag]
Distance
[ ' ]
Polar angle
[]
Object m (obj)
[mag]
Position (J2000)
Ra

Dec
09.09.2021 02:00 (11) Parthenope 12.1 7.0 246 20 Cnc 5.9 08h 23m 24s +18 20'
14.09.2021 03:00 (20) Massalia 11.2 8.5 132 63 Gem 5.2 07h 27m 42s +21 27'
15.09.2021 21:50 (44) Nysa 11.3 5.0 179 104 Tau 5.0 05h 27m 24s +18 39'
15.09.2021 23:10 (117) Lomia 12.0 1.5 356 13 Psc 6.4 23h 32m 00s -01 05'
17.09.2021 22:00 (1) Ceres 8.7 3.5 153 σ1 Tau 5.1 04h 39m 12s +15 48'
18.09.2021 02:00 (1) Ceres 8.7 10.0 175 σ2 Tau 4.7 04h 39m 18s +15 55'
19.09.2021 22:10 (59) Elpis 11.4 6.0 132 HIP 6751 6.7 01h 26m 54s +03 32'
22.09.2021 23:00 (143649) QQ47 13.7 5.5 52 HIP 4171 7.4 00h 53m 18s +19 46' Earth-crossing Asteroid
30.09.2021 21:30 (20) Massalia 11.1 6.5 27 HIP 39180 6.3 08h 00m 48s +19 49'
3.) Minorplanets: Close approaches by near-Earth objects with min. distance < 10 Lunar Distances LD
Date Time UT
[hh:mm]
Asteroid Min. distance
[LD]
rel. speed
[km/s]
Diameter
[m]
Ephemeris
09.09.2021 05:35 2021 QG 6.16 5.85 13 - 29 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2021%20QG
09.09.2021 14:49 2010 RJ53 7.84 19.28 774 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2010%20RJ53
22.09.2021 14:43 2021 NY1 3.90 9.35 130 - 290 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2021%20NY1
19.10.2021 05:07 2020 TH6 7.25 5.86 5 - 10 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2020%20TH6
20.10.2021 18:52 1996 VB3 8.75 15.32 100 - 230 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=1996%20VB3
26.10.2021 12:16 2019 UW6 7.82 11.11 13 - 28 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2019%20UW6
09.11.2021 03:48 2019 XS 1.49 10.68 48 - 110 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2019%20XS
15.11.2021 03:40 2016 VR 6.80 8.74 15 - 34 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2016%20VR
15.11.2021 11:38 2010 VK139 5.07 13.94 45 - 65 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2010%20VK139
15.11.2021 19:56 2019 VL5 8.43 8.02 18 - 39 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2019%20VL5
29.12.2021 01:54 2017 AE3 8.36 19.08 120 - 260 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2017%20AE3
07.01.2022 17:32 2020 AP1 0.003 5.65 3.2 - 7.1 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2020%20AP1
18.02.2022 09:20 2018 CW2 2.23 10.76 18 - 41 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2018%20CW2
06.03.2022 09:17 2020 DC 3.12 4.94 12 - 27 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2020%20DC
19.03.2022 11:39 2016 FZ12 2.08 8.31 12 - 27 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2016%20FZ12
21.03.2022 16:38 2020 SQ 2.19 6.02 8.8 - 20 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2020%20SQ
29.04.2022 16:26 2017 UK52 1.17 13.72 15 - 33 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2017%20UK52
11.05.2022 03:56 2019 JE 4.77 7.22 15 - 34 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2019%20JE
15.05.2022 15:45 2012 UX68 2.28 8.20 40 - 90 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2012%20UX68
30.05.2022 03:59 2021 KO2 1.23 14.75 6.6 - 15 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2021%20KO2
4.) Minorplanets: Close approaches (< 0.1 AU) by near-Earth objects with absolute brightness < 20 mag
Date Time UT
[hh:mm]
Asteroid Min. distance
[LD]
rel. speed
[km/s]
Diameter
[m]
Ephemeris
11.09.2021 08:35 2011 YQ10 35.84 6.65 440 - 990 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2011%20YQ10
13.09.2021 11:05 2021 MG1 22.02 17.26 590 - 1300 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2021%20MG1
15.09.2021 12:42 2001 EC 31.72 19.03 530 - 1200 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2001%20EC
17.09.2021 11:34 1991 TF3 33.97 14.19 370 - 840 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=1991%20TF3
23.09.2021 23:04 2003 QQ47 38.34 30.23 880 - 2000 https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=143649
5.) Comets:
Brightness
[mag]
Constellation Ephemeris
Short periodic comets:
4P/Faye 11.5 to 11.0 Orion https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=4P%20[]
15P/Finlay 12.0 Gemini https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=15P%20[]
67P/Tschurjumow-Gerasimenko 10.0 - 9.5 Taurus https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=67P%20[]
Long or not periodic comets:
C/2017 K2 (PANSTARRS) 12.0 Hercules https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=C/2017%20K2
C/2019 L3 (ATLAS) 11.0 Auriga - Lynx https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=C/2019%20L3
C/2021 A1 (Leonard) 13.0 Canis Major https://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=C/2021%20A1
(Sources: CNEOS MPC JPL )