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) |
| 2026-09-20 00:00 |
10:46:45.67 |
+26:11:46.7 |
HIP 52667 |
27.37 |
| 2026-09-20 12:00 |
10:46:54.85 |
+26:11:20.6 |
HIP 52667 |
27.65 |
| 2026-09-21 00:00 |
10:47:04.00 |
+26:10:55.2 |
HIP 52667 |
28.10 |
| 2026-09-21 12:00 |
10:47:13.13 |
+26:10:30.2 |
HIP 52667 |
28.70 |
| 2026-09-22 00:00 |
10:47:22.24 |
+26:10:05.8 |
HIP 52667 |
29.44 |
| 2026-09-22 12:00 |
10:47:31.31 |
+26:09:42.0 |
HIP 52667 |
30.31 |
| 2026-09-23 00:00 |
10:47:40.36 |
+26:09:18.7 |
HIP 52667 |
31.29 |
| 2026-09-23 12:00 |
10:47:49.39 |
+26:08:55.9 |
HIP 52667 |
32.38 |
| 2026-09-24 00:00 |
10:47:58.38 |
+26:08:33.7 |
HIP 52667 |
33.57 |
| 2026-09-24 12:00 |
10:48:07.35 |
+26:08:12.1 |
HIP 52667 |
34.83 |
| 2026-09-25 00:00 |
10:48:16.29 |
+26:07:51.0 |
HIP 52667 |
36.17 |
| 2026-09-25 12:00 |
10:48:25.20 |
+26:07:30.5 |
HIP 52994 |
35.72 |
| 2026-09-26 00:00 |
10:48:34.07 |
+26:07:10.6 |
HIP 52994 |
34.45 |
| 2026-09-26 12:00 |
10:48:42.92 |
+26:06:51.2 |
HIP 52994 |
33.25 |
| 2026-09-27 00:00 |
10:48:51.74 |
+26:06:32.4 |
HIP 52994 |
32.14 |
| 2026-09-27 12:00 |
10:49:00.52 |
+26:06:14.2 |
HIP 52994 |
31.11 |
| 2026-09-28 00:00 |
10:49:09.27 |
+26:05:56.5 |
HIP 52994 |
30.17 |
| 2026-09-28 12:00 |
10:49:17.99 |
+26:05:39.5 |
HIP 52994 |
29.33 |
| 2026-09-29 00:00 |
10:49:26.67 |
+26:05:23.0 |
HIP 52994 |
28.60 |
| 2026-09-29 12:00 |
10:49:35.32 |
+26:05:07.1 |
HIP 52994 |
27.98 |
| 2026-09-30 00:00 |
10:49:43.94 |
+26:04:51.8 |
HIP 52994 |
27.48 |
| 2026-09-30 12:00 |
10:49:52.52 |
+26:04:37.1 |
HIP 52994 |
27.10 |
| 2026-10-01 00:00 |
10:50:01.06 |
+26:04:23.1 |
HIP 52998 |
26.76 |
| 2026-10-01 12:00 |
10:50:09.57 |
+26:04:09.6 |
HIP 52998 |
26.14 |
| 2026-10-02 00:00 |
10:50:18.04 |
+26:03:56.7 |
HIP 52998 |
25.67 |
| 2026-10-02 12:00 |
10:50:26.47 |
+26:03:44.4 |
HIP 52998 |
25.34 |
| 2026-10-03 00:00 |
10:50:34.86 |
+26:03:32.8 |
HIP 52998 |
25.17 |
| 2026-10-03 12:00 |
10:50:43.21 |
+26:03:21.8 |
HIP 52998 |
25.15 |
| 2026-10-04 00:00 |
10:50:51.52 |
+26:03:11.4 |
HIP 52998 |
25.27 |
| 2026-10-04 12:00 |
10:50:59.79 |
+26:03:01.6 |
HIP 52998 |
25.54 |
| 2026-10-05 00:00 |
10:51:08.02 |
+26:02:52.5 |
HIP 52998 |
25.95 |
| 2026-10-05 12:00 |
10:51:16.21 |
+26:02:44.0 |
HIP 52998 |
26.50 |
| 2026-10-06 00:00 |
10:51:24.35 |
+26:02:36.1 |
HIP 52998 |
27.16 |
| 2026-10-06 12:00 |
10:51:32.45 |
+26:02:28.9 |
HIP 52998 |
27.93 |
| 2026-10-07 00:00 |
10:51:40.51 |
+26:02:22.4 |
HIP 53262 |
27.58 |
| 2026-10-07 12:00 |
10:51:48.52 |
+26:02:16.5 |
HIP 53262 |
25.95 |
| 2026-10-08 00:00 |
10:51:56.48 |
+26:02:11.2 |
HIP 53262 |
24.36 |
| 2026-10-08 12:00 |
10:52:04.40 |
+26:02:06.6 |
HIP 53262 |
22.79 |
| 2026-10-09 00:00 |
10:52:12.27 |
+26:02:02.7 |
HIP 53262 |
21.27 |
| 2026-10-09 12:00 |
10:52:20.09 |
+26:01:59.4 |
HIP 53262 |
19.78 |
| 2026-10-10 00:00 |
10:52:27.87 |
+26:01:56.9 |
HIP 53262 |
18.35 |
| 2026-10-10 12:00 |
10:52:35.59 |
+26:01:55.0 |
HIP 53262 |
16.98 |
| 2026-10-11 00:00 |
10:52:43.26 |
+26:01:53.7 |
HIP 53262 |
15.68 |