메타데이터
| 항목 |
값 |
| Designation |
121P/Shoemaker-Holt 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2004-03-07T04:12:50.042880Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:13:18Z |
| Obs used |
769 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
18.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2008-07-29.0000000 |
| e |
0.20653217 |
| q (au) |
3.578428 |
| a (au) |
4.509859 |
| i (deg) |
20.819382 |
| Ω (om, deg) |
96.006730 |
| ω (w, deg) |
18.114322 |
| M (ma, deg) |
165.153239 |
밝기
산란 + 전체 선형
$$
M_a = (16.404 + 2.723\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
16.404 |
| n |
2.723 |
| gf |
1.000 |
| gb |
-0.696 |
| k |
0.800 |
| 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 |
15:56:24.78 |
-02:50:33.2 |
HIP 78116 |
12.94 |
| 2026-03-26 12:00 |
15:56:19.86 |
-02:49:29.4 |
HIP 78116 |
14.57 |
| 2026-03-27 00:00 |
15:56:14.73 |
-02:48:25.5 |
HIP 78116 |
16.23 |
| 2026-03-27 12:00 |
15:56:09.39 |
-02:47:21.5 |
HIP 78116 |
17.94 |
| 2026-03-28 00:00 |
15:56:03.86 |
-02:46:17.3 |
HIP 78116 |
19.68 |
| 2026-03-28 12:00 |
15:55:58.11 |
-02:45:13.1 |
HIP 78116 |
21.46 |
| 2026-03-29 00:00 |
15:55:52.17 |
-02:44:08.9 |
HIP 78116 |
23.29 |
| 2026-03-29 12:00 |
15:55:46.02 |
-02:43:04.5 |
HIP 78116 |
25.15 |
| 2026-03-30 00:00 |
15:55:39.68 |
-02:42:00.1 |
HIP 78116 |
27.05 |
| 2026-03-30 12:00 |
15:55:33.13 |
-02:40:55.7 |
HIP 78116 |
29.00 |
| 2026-03-31 00:00 |
15:55:26.38 |
-02:39:51.3 |
HIP 78024 |
30.82 |
| 2026-03-31 12:00 |
15:55:19.43 |
-02:38:46.8 |
HIP 78024 |
30.23 |
| 2026-04-01 00:00 |
15:55:12.29 |
-02:37:42.3 |
HIP 78024 |
29.79 |
| 2026-04-01 12:00 |
15:55:04.94 |
-02:36:37.9 |
HIP 78024 |
29.51 |
| 2026-04-02 00:00 |
15:54:57.41 |
-02:35:33.4 |
HIP 78024 |
29.41 |
| 2026-04-02 12:00 |
15:54:49.67 |
-02:34:29.0 |
HIP 78024 |
29.49 |
| 2026-04-03 00:00 |
15:54:41.74 |
-02:33:24.7 |
HIP 78024 |
29.77 |
| 2026-04-03 12:00 |
15:54:33.62 |
-02:32:20.4 |
HIP 78024 |
30.25 |
| 2026-04-04 00:00 |
15:54:25.31 |
-02:31:16.1 |
HIP 78024 |
30.93 |
| 2026-04-04 12:00 |
15:54:16.80 |
-02:30:12.0 |
HIP 78024 |
31.80 |
| 2026-04-05 00:00 |
15:54:08.10 |
-02:29:08.0 |
HIP 77728 |
31.43 |
| 2026-04-05 12:00 |
15:53:59.21 |
-02:28:04.0 |
HIP 77728 |
28.97 |
| 2026-04-06 00:00 |
15:53:50.14 |
-02:27:00.2 |
HIP 77728 |
26.47 |
| 2026-04-06 12:00 |
15:53:40.87 |
-02:25:56.6 |
HIP 77728 |
23.93 |
| 2026-04-07 00:00 |
15:53:31.42 |
-02:24:53.0 |
HIP 77728 |
21.34 |
| 2026-04-07 12:00 |
15:53:21.79 |
-02:23:49.7 |
HIP 77728 |
18.71 |
| 2026-04-08 00:00 |
15:53:11.97 |
-02:22:46.5 |
HIP 77728 |
16.04 |
| 2026-04-08 12:00 |
15:53:01.97 |
-02:21:43.5 |
HIP 77728 |
13.33 |
| 2026-04-09 00:00 |
15:52:51.79 |
-02:20:40.8 |
HIP 77728 |
10.58 |
| 2026-04-09 12:00 |
15:52:41.42 |
-02:19:38.2 |
HIP 77728 |
7.79 |
| 2026-04-10 00:00 |
15:52:30.88 |
-02:18:35.9 |
HIP 77728 |
4.96 |
| 2026-04-10 12:00 |
15:52:20.16 |
-02:17:33.8 |
HIP 77728 |
2.09 |
| 2026-04-11 00:00 |
15:52:09.27 |
-02:16:32.0 |
HIP 77728 |
0.83 |
| 2026-04-11 12:00 |
15:51:58.20 |
-02:15:30.5 |
HIP 77728 |
3.77 |
| 2026-04-12 00:00 |
15:51:46.96 |
-02:14:29.2 |
HIP 77728 |
6.76 |
| 2026-04-12 12:00 |
15:51:35.54 |
-02:13:28.3 |
HIP 77728 |
9.79 |
| 2026-04-13 00:00 |
15:51:23.96 |
-02:12:27.7 |
HIP 77728 |
12.85 |
| 2026-04-13 12:00 |
15:51:12.21 |
-02:11:27.4 |
HIP 77594 |
10.89 |
| 2026-04-14 00:00 |
15:51:00.29 |
-02:10:27.5 |
HIP 77594 |
8.50 |
| 2026-04-14 12:00 |
15:50:48.21 |
-02:09:27.9 |
HIP 77594 |
6.73 |
| 2026-04-15 00:00 |
15:50:35.97 |
-02:08:28.7 |
HIP 77594 |
6.19 |
| 2026-04-15 12:00 |
15:50:23.56 |
-02:07:29.9 |
HIP 77594 |
7.22 |
| 2026-04-16 00:00 |
15:50:11.00 |
-02:06:31.6 |
HIP 77594 |
9.34 |