메타데이터
| 항목 |
값 |
| Designation |
C/2010 A4 (Siding Spring) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-10-08T17:46:24.746880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:39Z |
| Obs used |
140 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
15.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2010-05-04.0000000 |
| e |
0.99062596 |
| q (au) |
2.737996 |
| a (au) |
292.082906 |
| i (deg) |
96.730138 |
| Ω (om, deg) |
346.685502 |
| ω (w, deg) |
271.685276 |
| M (ma, deg) |
359.968855 |
밝기
산란 + 전체 선형
$$
M_a = (7.590 + 5.685\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.590 |
| n |
5.685 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.998 |
| 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 |
20:56:02.55 |
+43:00:39.0 |
HIP 103355 |
8.14 |
| 2026-03-26 12:00 |
20:56:05.19 |
+43:01:24.6 |
HIP 103355 |
7.24 |
| 2026-03-27 00:00 |
20:56:07.79 |
+43:02:10.5 |
HIP 103355 |
6.34 |
| 2026-03-27 12:00 |
20:56:10.37 |
+43:02:56.5 |
HIP 103355 |
5.44 |
| 2026-03-28 00:00 |
20:56:12.91 |
+43:03:42.7 |
HIP 103355 |
4.55 |
| 2026-03-28 12:00 |
20:56:15.42 |
+43:04:29.1 |
HIP 103355 |
3.65 |
| 2026-03-29 00:00 |
20:56:17.90 |
+43:05:15.7 |
HIP 103355 |
2.76 |
| 2026-03-29 12:00 |
20:56:20.34 |
+43:06:02.4 |
HIP 103355 |
1.87 |
| 2026-03-30 00:00 |
20:56:22.75 |
+43:06:49.3 |
HIP 103355 |
0.98 |
| 2026-03-30 12:00 |
20:56:25.12 |
+43:07:36.4 |
HIP 103355 |
0.25 |
| 2026-03-31 00:00 |
20:56:27.46 |
+43:08:23.6 |
HIP 103355 |
0.87 |
| 2026-03-31 12:00 |
20:56:29.77 |
+43:09:11.0 |
HIP 103355 |
1.75 |
| 2026-04-01 00:00 |
20:56:32.04 |
+43:09:58.5 |
HIP 103355 |
2.63 |
| 2026-04-01 12:00 |
20:56:34.28 |
+43:10:46.2 |
HIP 103355 |
3.52 |
| 2026-04-02 00:00 |
20:56:36.48 |
+43:11:34.0 |
HIP 103355 |
4.41 |
| 2026-04-02 12:00 |
20:56:38.65 |
+43:12:22.0 |
HIP 103355 |
5.30 |
| 2026-04-03 00:00 |
20:56:40.79 |
+43:13:10.1 |
HIP 103355 |
6.19 |
| 2026-04-03 12:00 |
20:56:42.89 |
+43:13:58.4 |
HIP 103355 |
7.08 |
| 2026-04-04 00:00 |
20:56:44.95 |
+43:14:46.8 |
HIP 103355 |
7.97 |
| 2026-04-04 12:00 |
20:56:46.98 |
+43:15:35.3 |
HIP 103355 |
8.86 |
| 2026-04-05 00:00 |
20:56:48.97 |
+43:16:24.0 |
HIP 103355 |
9.74 |
| 2026-04-05 12:00 |
20:56:50.93 |
+43:17:12.8 |
HIP 103355 |
10.63 |
| 2026-04-06 00:00 |
20:56:52.85 |
+43:18:01.7 |
HIP 103341 |
10.56 |
| 2026-04-06 12:00 |
20:56:54.73 |
+43:18:50.8 |
HIP 103341 |
10.26 |
| 2026-04-07 00:00 |
20:56:56.58 |
+43:19:39.9 |
HIP 103341 |
10.02 |
| 2026-04-07 12:00 |
20:56:58.39 |
+43:20:29.2 |
HIP 103341 |
9.85 |
| 2026-04-08 00:00 |
20:57:00.17 |
+43:21:18.6 |
HIP 103341 |
9.75 |
| 2026-04-08 12:00 |
20:57:01.91 |
+43:22:08.1 |
HIP 103341 |
9.73 |
| 2026-04-09 00:00 |
20:57:03.61 |
+43:22:57.8 |
HIP 103341 |
9.77 |
| 2026-04-09 12:00 |
20:57:05.27 |
+43:23:47.5 |
HIP 103341 |
9.89 |
| 2026-04-10 00:00 |
20:57:06.90 |
+43:24:37.3 |
HIP 103341 |
10.08 |
| 2026-04-10 12:00 |
20:57:08.49 |
+43:25:27.2 |
HIP 103341 |
10.33 |
| 2026-04-11 00:00 |
20:57:10.04 |
+43:26:17.2 |
HIP 103341 |
10.65 |
| 2026-04-11 12:00 |
20:57:11.56 |
+43:27:07.4 |
HIP 103341 |
11.01 |
| 2026-04-12 00:00 |
20:57:13.04 |
+43:27:57.6 |
HIP 103341 |
11.43 |
| 2026-04-12 12:00 |
20:57:14.47 |
+43:28:47.8 |
HIP 103341 |
11.89 |
| 2026-04-13 00:00 |
20:57:15.87 |
+43:29:38.2 |
HIP 103341 |
12.39 |
| 2026-04-13 12:00 |
20:57:17.24 |
+43:30:28.7 |
HIP 103341 |
12.93 |
| 2026-04-14 00:00 |
20:57:18.56 |
+43:31:19.2 |
HIP 103341 |
13.49 |
| 2026-04-14 12:00 |
20:57:19.84 |
+43:32:09.8 |
HIP 103341 |
14.08 |
| 2026-04-15 00:00 |
20:57:21.09 |
+43:33:00.4 |
HIP 103341 |
14.69 |
| 2026-04-15 12:00 |
20:57:22.30 |
+43:33:51.2 |
HIP 103341 |
15.33 |
| 2026-04-16 00:00 |
20:57:23.46 |
+43:34:41.9 |
HIP 103341 |
15.98 |