메타데이터
| 항목 |
값 |
| Designation |
389P/Siding Spring |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-01-02T20:23:08.842560Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:43:35Z |
| Obs used |
103 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
19.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-09-25T12:36:33.696000Z |
| Discovery magnitude (MPC) |
20.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2013-11-08.0000000 |
| e |
0.70466929 |
| q (au) |
1.659623 |
| a (au) |
5.619542 |
| i (deg) |
160.071918 |
| Ω (om, deg) |
218.811242 |
| ω (w, deg) |
249.490302 |
| M (ma, deg) |
193.763391 |
밝기
산란 + 전체 선형
$$
M_a = (14.922 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.922 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.937 |
| k |
0.999 |
| δ90 |
10.000 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
10:40:55.01 |
+29:52:27.5 |
HIP 52192 |
14.88 |
| 2026-03-26 12:00 |
10:40:39.67 |
+29:53:16.5 |
HIP 52192 |
11.53 |
| 2026-03-27 00:00 |
10:40:24.41 |
+29:54:04.4 |
HIP 52192 |
8.26 |
| 2026-03-27 12:00 |
10:40:09.22 |
+29:54:51.4 |
HIP 52192 |
5.18 |
| 2026-03-28 00:00 |
10:39:54.10 |
+29:55:37.3 |
HIP 52192 |
2.89 |
| 2026-03-28 12:00 |
10:39:39.05 |
+29:56:22.3 |
HIP 52192 |
3.51 |
| 2026-03-29 00:00 |
10:39:24.07 |
+29:57:06.2 |
HIP 52192 |
6.20 |
| 2026-03-29 12:00 |
10:39:09.18 |
+29:57:49.1 |
HIP 52192 |
9.28 |
| 2026-03-30 00:00 |
10:38:54.36 |
+29:58:31.0 |
HIP 52192 |
12.46 |
| 2026-03-30 12:00 |
10:38:39.61 |
+29:59:11.9 |
HIP 52192 |
15.66 |
| 2026-03-31 00:00 |
10:38:24.95 |
+29:59:51.9 |
HIP 52192 |
18.86 |
| 2026-03-31 12:00 |
10:38:10.36 |
+30:00:30.8 |
HIP 52192 |
22.05 |
| 2026-04-01 00:00 |
10:37:55.86 |
+30:01:08.7 |
HIP 51957 |
19.92 |
| 2026-04-01 12:00 |
10:37:41.44 |
+30:01:45.6 |
HIP 51957 |
17.36 |
| 2026-04-02 00:00 |
10:37:27.10 |
+30:02:21.6 |
HIP 51957 |
15.06 |
| 2026-04-02 12:00 |
10:37:12.85 |
+30:02:56.5 |
HIP 51957 |
13.15 |
| 2026-04-03 00:00 |
10:36:58.68 |
+30:03:30.4 |
HIP 51957 |
11.80 |
| 2026-04-03 12:00 |
10:36:44.60 |
+30:04:03.4 |
HIP 51957 |
11.19 |
| 2026-04-04 00:00 |
10:36:30.61 |
+30:04:35.4 |
HIP 51957 |
11.42 |
| 2026-04-04 12:00 |
10:36:16.70 |
+30:05:06.4 |
HIP 51957 |
12.43 |
| 2026-04-05 00:00 |
10:36:02.89 |
+30:05:36.4 |
HIP 51957 |
14.04 |
| 2026-04-05 12:00 |
10:35:49.16 |
+30:06:05.4 |
HIP 51957 |
16.06 |
| 2026-04-06 00:00 |
10:35:35.53 |
+30:06:33.5 |
HIP 51878 |
18.06 |
| 2026-04-06 12:00 |
10:35:21.98 |
+30:07:00.5 |
HIP 51878 |
18.59 |
| 2026-04-07 00:00 |
10:35:08.54 |
+30:07:26.6 |
HIP 51878 |
19.57 |
| 2026-04-07 12:00 |
10:34:55.18 |
+30:07:51.8 |
HIP 51878 |
20.91 |
| 2026-04-08 00:00 |
10:34:41.92 |
+30:08:15.9 |
HIP 51878 |
22.55 |
| 2026-04-08 12:00 |
10:34:28.76 |
+30:08:39.2 |
HIP 51878 |
24.41 |
| 2026-04-09 00:00 |
10:34:15.69 |
+30:09:01.4 |
HIP 51878 |
26.45 |
| 2026-04-09 12:00 |
10:34:02.73 |
+30:09:22.7 |
HIP 51878 |
28.62 |
| 2026-04-10 00:00 |
10:33:49.86 |
+30:09:43.0 |
HIP 51878 |
30.88 |
| 2026-04-10 12:00 |
10:33:37.09 |
+30:10:02.4 |
HIP 51878 |
33.21 |
| 2026-04-11 00:00 |
10:33:24.42 |
+30:10:20.8 |
HIP 51574 |
31.94 |
| 2026-04-11 12:00 |
10:33:11.85 |
+30:10:38.3 |
HIP 51487 |
30.11 |
| 2026-04-12 00:00 |
10:32:59.39 |
+30:10:54.8 |
HIP 51487 |
27.45 |
| 2026-04-12 12:00 |
10:32:47.03 |
+30:11:10.5 |
HIP 51487 |
24.82 |
| 2026-04-13 00:00 |
10:32:34.77 |
+30:11:25.1 |
HIP 51487 |
22.23 |
| 2026-04-13 12:00 |
10:32:22.62 |
+30:11:38.8 |
HIP 51487 |
19.69 |
| 2026-04-14 00:00 |
10:32:10.57 |
+30:11:51.6 |
HIP 51487 |
17.20 |
| 2026-04-14 12:00 |
10:31:58.63 |
+30:12:03.5 |
HIP 51487 |
14.79 |
| 2026-04-15 00:00 |
10:31:46.79 |
+30:12:14.5 |
HIP 51487 |
12.47 |
| 2026-04-15 12:00 |
10:31:35.07 |
+30:12:24.5 |
HIP 51487 |
10.29 |
| 2026-04-16 00:00 |
10:31:23.45 |
+30:12:33.6 |
HIP 51487 |
8.35 |