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) |
| 2026-06-01 00:00 |
08:36:12.41 |
+54:52:12.9 |
HIP 42126 |
13.79 |
| 2026-06-01 12:00 |
08:36:17.45 |
+54:51:03.3 |
HIP 42126 |
15.15 |
| 2026-06-02 00:00 |
08:36:22.57 |
+54:49:53.9 |
HIP 42126 |
16.52 |
| 2026-06-02 12:00 |
08:36:27.78 |
+54:48:44.7 |
HIP 42126 |
17.89 |
| 2026-06-03 00:00 |
08:36:33.07 |
+54:47:35.8 |
HIP 42126 |
19.27 |
| 2026-06-03 12:00 |
08:36:38.44 |
+54:46:27.1 |
HIP 42126 |
20.65 |
| 2026-06-04 00:00 |
08:36:43.89 |
+54:45:18.7 |
HIP 42126 |
22.04 |
| 2026-06-04 12:00 |
08:36:49.42 |
+54:44:10.5 |
HIP 42126 |
23.43 |
| 2026-06-05 00:00 |
08:36:55.03 |
+54:43:02.5 |
HIP 42126 |
24.82 |
| 2026-06-05 12:00 |
08:37:00.72 |
+54:41:54.8 |
HIP 42126 |
26.22 |
| 2026-06-06 00:00 |
08:37:06.49 |
+54:40:47.3 |
HIP 42126 |
27.62 |
| 2026-06-06 12:00 |
08:37:12.33 |
+54:39:40.1 |
HIP 42126 |
29.02 |
| 2026-06-07 00:00 |
08:37:18.25 |
+54:38:33.1 |
HIP 42126 |
30.42 |
| 2026-06-07 12:00 |
08:37:24.25 |
+54:37:26.4 |
HIP 42126 |
31.83 |
| 2026-06-08 00:00 |
08:37:30.32 |
+54:36:20.0 |
HIP 42126 |
33.25 |
| 2026-06-08 12:00 |
08:37:36.46 |
+54:35:13.8 |
HIP 42126 |
34.66 |
| 2026-06-09 00:00 |
08:37:42.68 |
+54:34:07.9 |
HIP 42126 |
36.08 |
| 2026-06-09 12:00 |
08:37:48.98 |
+54:33:02.3 |
HIP 42126 |
37.50 |
| 2026-06-10 00:00 |
08:37:55.34 |
+54:31:56.9 |
HIP 42126 |
38.93 |
| 2026-06-10 12:00 |
08:38:01.78 |
+54:30:51.9 |
HIP 42126 |
40.35 |
| 2026-06-11 00:00 |
08:38:08.29 |
+54:29:47.1 |
HIP 42126 |
41.78 |
| 2026-06-11 12:00 |
08:38:14.86 |
+54:28:42.6 |
HIP 42126 |
43.22 |
| 2026-06-12 00:00 |
08:38:21.51 |
+54:27:38.3 |
HIP 42393 |
44.35 |
| 2026-06-12 12:00 |
08:38:28.23 |
+54:26:34.4 |
HIP 42393 |
43.24 |
| 2026-06-13 00:00 |
08:38:35.01 |
+54:25:30.8 |
HIP 42393 |
42.15 |
| 2026-06-13 12:00 |
08:38:41.86 |
+54:24:27.4 |
HIP 42393 |
41.08 |
| 2026-06-14 00:00 |
08:38:48.78 |
+54:23:24.4 |
HIP 42393 |
40.05 |
| 2026-06-14 12:00 |
08:38:55.76 |
+54:22:21.7 |
HIP 42393 |
39.05 |
| 2026-06-15 00:00 |
08:39:02.81 |
+54:21:19.3 |
HIP 42393 |
38.09 |
| 2026-06-15 12:00 |
08:39:09.93 |
+54:20:17.2 |
HIP 42393 |
37.17 |
| 2026-06-16 00:00 |
08:39:17.10 |
+54:19:15.4 |
HIP 42393 |
36.29 |
| 2026-06-16 12:00 |
08:39:24.34 |
+54:18:13.9 |
HIP 42393 |
35.45 |
| 2026-06-17 00:00 |
08:39:31.65 |
+54:17:12.7 |
HIP 42393 |
34.67 |
| 2026-06-17 12:00 |
08:39:39.01 |
+54:16:11.9 |
HIP 42393 |
33.94 |
| 2026-06-18 00:00 |
08:39:46.43 |
+54:15:11.4 |
HIP 42393 |
33.27 |
| 2026-06-18 12:00 |
08:39:53.91 |
+54:14:11.2 |
HIP 42393 |
32.66 |
| 2026-06-19 00:00 |
08:40:01.45 |
+54:13:11.4 |
HIP 42393 |
32.12 |
| 2026-06-19 12:00 |
08:40:09.05 |
+54:12:11.9 |
HIP 42393 |
31.65 |
| 2026-06-20 00:00 |
08:40:16.71 |
+54:11:12.7 |
HIP 42393 |
31.25 |
| 2026-06-20 12:00 |
08:40:24.42 |
+54:10:13.9 |
HIP 42393 |
30.92 |
| 2026-06-21 00:00 |
08:40:32.19 |
+54:09:15.4 |
HIP 42393 |
30.68 |
| 2026-06-21 12:00 |
08:40:40.01 |
+54:08:17.2 |
HIP 42393 |
30.52 |
| 2026-06-22 00:00 |
08:40:47.88 |
+54:07:19.5 |
HIP 42393 |
30.44 |