메타데이터
| 항목 |
값 |
| Designation |
C/2020 J1 (SONEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-04-18T14:32:05.205120Z |
| Orbit solution date (soln_date, UTC) |
2023-05-24T21:12:29Z |
| Obs used |
1423 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
7.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-05-01T06:33:40.896000Z |
| Discovery magnitude (MPC) |
17.00 R |
| Discovery observatory (MPC) |
Y00 · SONEAR Observatory, Oliveira |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-10-28.0000000 |
| e |
1.00036308 |
| q (au) |
3.355156 |
| a (au) |
-9240.744312 |
| i (deg) |
142.295628 |
| Ω (om, deg) |
226.582890 |
| ω (w, deg) |
341.755563 |
| M (ma, deg) |
0.000213 |
밝기
산란 + 전체 선형
$$
M_a = (7.505 + 3.369\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.505 |
| n |
3.369 |
| gf |
0.833 |
| gb |
-0.500 |
| k |
0.921 |
| δ90 |
2.649 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2020-04-19 |
2021-04-17 |
+0.2477 |
+0.184 |
| 2021-04-19 |
2021-12-01 |
-7.4917 |
+3.560 |
| 2021-12-01 |
2023-05-23 |
+6.0369 |
-4.382 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
09:07:57.80 |
+53:20:05.0 |
HIP 44861 |
4.66 |
| 2026-09-20 12:00 |
09:08:04.42 |
+53:20:39.0 |
HIP 44861 |
4.12 |
| 2026-09-21 00:00 |
09:08:10.97 |
+53:21:13.7 |
HIP 44861 |
3.88 |
| 2026-09-21 12:00 |
09:08:17.46 |
+53:21:48.9 |
HIP 44861 |
3.97 |
| 2026-09-22 00:00 |
09:08:23.87 |
+53:22:24.7 |
HIP 44861 |
4.38 |
| 2026-09-22 12:00 |
09:08:30.22 |
+53:23:01.1 |
HIP 44861 |
5.02 |
| 2026-09-23 00:00 |
09:08:36.50 |
+53:23:38.1 |
HIP 44861 |
5.81 |
| 2026-09-23 12:00 |
09:08:42.71 |
+53:24:15.6 |
HIP 44861 |
6.71 |
| 2026-09-24 00:00 |
09:08:48.85 |
+53:24:53.8 |
HIP 44861 |
7.67 |
| 2026-09-24 12:00 |
09:08:54.91 |
+53:25:32.5 |
HIP 44861 |
8.66 |
| 2026-09-25 00:00 |
09:09:00.91 |
+53:26:11.8 |
HIP 44861 |
9.69 |
| 2026-09-25 12:00 |
09:09:06.84 |
+53:26:51.7 |
HIP 44861 |
10.73 |
| 2026-09-26 00:00 |
09:09:12.69 |
+53:27:32.1 |
HIP 44861 |
11.79 |
| 2026-09-26 12:00 |
09:09:18.47 |
+53:28:13.2 |
HIP 44861 |
12.85 |
| 2026-09-27 00:00 |
09:09:24.17 |
+53:28:54.8 |
HIP 44861 |
13.92 |
| 2026-09-27 12:00 |
09:09:29.80 |
+53:29:36.9 |
HIP 44861 |
15.00 |
| 2026-09-28 00:00 |
09:09:35.35 |
+53:30:19.7 |
HIP 44861 |
16.07 |
| 2026-09-28 12:00 |
09:09:40.83 |
+53:31:03.0 |
HIP 44861 |
17.15 |
| 2026-09-29 00:00 |
09:09:46.24 |
+53:31:46.9 |
HIP 44861 |
18.23 |
| 2026-09-29 12:00 |
09:09:51.56 |
+53:32:31.4 |
HIP 44861 |
19.31 |
| 2026-09-30 00:00 |
09:09:56.81 |
+53:33:16.4 |
HIP 44861 |
20.39 |
| 2026-09-30 12:00 |
09:10:01.98 |
+53:34:02.1 |
HIP 44861 |
21.47 |
| 2026-10-01 00:00 |
09:10:07.07 |
+53:34:48.2 |
HIP 44861 |
22.54 |
| 2026-10-01 12:00 |
09:10:12.08 |
+53:35:35.0 |
HIP 44861 |
23.62 |
| 2026-10-02 00:00 |
09:10:17.02 |
+53:36:22.3 |
HIP 44861 |
24.70 |
| 2026-10-02 12:00 |
09:10:21.87 |
+53:37:10.2 |
HIP 44861 |
25.77 |
| 2026-10-03 00:00 |
09:10:26.64 |
+53:37:58.6 |
HIP 44861 |
26.84 |
| 2026-10-03 12:00 |
09:10:31.32 |
+53:38:47.6 |
HIP 44861 |
27.92 |
| 2026-10-04 00:00 |
09:10:35.93 |
+53:39:37.2 |
HIP 44861 |
28.99 |
| 2026-10-04 12:00 |
09:10:40.45 |
+53:40:27.3 |
HIP 44861 |
30.05 |
| 2026-10-05 00:00 |
09:10:44.88 |
+53:41:18.0 |
HIP 44861 |
31.12 |
| 2026-10-05 12:00 |
09:10:49.23 |
+53:42:09.3 |
HIP 44861 |
32.19 |
| 2026-10-06 00:00 |
09:10:53.50 |
+53:43:01.1 |
HIP 44861 |
33.25 |
| 2026-10-06 12:00 |
09:10:57.68 |
+53:43:53.4 |
HIP 44861 |
34.32 |
| 2026-10-07 00:00 |
09:11:01.77 |
+53:44:46.3 |
HIP 45337 |
35.30 |
| 2026-10-07 12:00 |
09:11:05.77 |
+53:45:39.8 |
HIP 45337 |
34.31 |
| 2026-10-08 00:00 |
09:11:09.69 |
+53:46:33.8 |
HIP 45337 |
33.34 |
| 2026-10-08 12:00 |
09:11:13.51 |
+53:47:28.3 |
HIP 45337 |
32.38 |
| 2026-10-09 00:00 |
09:11:17.25 |
+53:48:23.4 |
HIP 45337 |
31.44 |
| 2026-10-09 12:00 |
09:11:20.90 |
+53:49:19.1 |
HIP 45337 |
30.51 |
| 2026-10-10 00:00 |
09:11:24.45 |
+53:50:15.3 |
HIP 45337 |
29.60 |
| 2026-10-10 12:00 |
09:11:27.91 |
+53:51:12.0 |
HIP 45337 |
28.71 |
| 2026-10-11 00:00 |
09:11:31.28 |
+53:52:09.2 |
HIP 45337 |
27.84 |