메타데이터
| 항목 |
값 |
| Designation |
C/1997 H2 (SOHO) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-05-03T04:04:48Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
115 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1997-05-03.1700000 |
| e |
1.00000000 |
| q (au) |
0.136100 |
| a (au) |
- |
| i (deg) |
18.320000 |
| Ω (om, deg) |
225.820000 |
| ω (w, deg) |
201.470000 |
| M (ma, deg) |
- |
밝기
산란 + 전체 선형
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-05-12 00:00 |
15:59:23.02 |
-15:29:31.9 |
HIP 78211 |
16.39 |
| 2026-05-12 12:00 |
15:59:20.80 |
-15:29:24.7 |
HIP 78211 |
15.84 |
| 2026-05-13 00:00 |
15:59:18.57 |
-15:29:17.5 |
HIP 78211 |
15.30 |
| 2026-05-13 12:00 |
15:59:16.35 |
-15:29:10.3 |
HIP 78211 |
14.76 |
| 2026-05-14 00:00 |
15:59:14.11 |
-15:29:03.2 |
HIP 78211 |
14.22 |
| 2026-05-14 12:00 |
15:59:11.88 |
-15:28:56.0 |
HIP 78211 |
13.68 |
| 2026-05-15 00:00 |
15:59:09.64 |
-15:28:48.9 |
HIP 78211 |
13.14 |
| 2026-05-15 12:00 |
15:59:07.40 |
-15:28:41.7 |
HIP 78211 |
12.60 |
| 2026-05-16 00:00 |
15:59:05.16 |
-15:28:34.6 |
HIP 78211 |
12.06 |
| 2026-05-16 12:00 |
15:59:02.91 |
-15:28:27.5 |
HIP 78211 |
11.52 |
| 2026-05-17 00:00 |
15:59:00.66 |
-15:28:20.4 |
HIP 78211 |
10.98 |
| 2026-05-17 12:00 |
15:58:58.41 |
-15:28:13.4 |
HIP 78211 |
10.44 |
| 2026-05-18 00:00 |
15:58:56.16 |
-15:28:06.4 |
HIP 78211 |
9.91 |
| 2026-05-18 12:00 |
15:58:53.91 |
-15:27:59.3 |
HIP 78211 |
9.37 |
| 2026-05-19 00:00 |
15:58:51.66 |
-15:27:52.3 |
HIP 78211 |
8.84 |
| 2026-05-19 12:00 |
15:58:49.40 |
-15:27:45.4 |
HIP 78211 |
8.31 |
| 2026-05-20 00:00 |
15:58:47.14 |
-15:27:38.4 |
HIP 78211 |
7.79 |
| 2026-05-20 12:00 |
15:58:44.89 |
-15:27:31.5 |
HIP 78211 |
7.27 |
| 2026-05-21 00:00 |
15:58:42.63 |
-15:27:24.6 |
HIP 78211 |
6.75 |
| 2026-05-21 12:00 |
15:58:40.37 |
-15:27:17.7 |
HIP 78211 |
6.24 |
| 2026-05-22 00:00 |
15:58:38.11 |
-15:27:10.8 |
HIP 78211 |
5.74 |
| 2026-05-22 12:00 |
15:58:35.85 |
-15:27:03.9 |
HIP 78211 |
5.25 |
| 2026-05-23 00:00 |
15:58:33.59 |
-15:26:57.1 |
HIP 78211 |
4.77 |
| 2026-05-23 12:00 |
15:58:31.33 |
-15:26:50.3 |
HIP 78211 |
4.32 |
| 2026-05-24 00:00 |
15:58:29.08 |
-15:26:43.6 |
HIP 78211 |
3.89 |
| 2026-05-24 12:00 |
15:58:26.82 |
-15:26:36.8 |
HIP 78211 |
3.49 |
| 2026-05-25 00:00 |
15:58:24.56 |
-15:26:30.1 |
HIP 78211 |
3.15 |
| 2026-05-25 12:00 |
15:58:22.31 |
-15:26:23.4 |
HIP 78211 |
2.87 |
| 2026-05-26 00:00 |
15:58:20.05 |
-15:26:16.7 |
HIP 78211 |
2.67 |
| 2026-05-26 12:00 |
15:58:17.80 |
-15:26:10.1 |
HIP 78211 |
2.59 |
| 2026-05-27 00:00 |
15:58:15.54 |
-15:26:03.5 |
HIP 78211 |
2.62 |
| 2026-05-27 12:00 |
15:58:13.29 |
-15:25:56.9 |
HIP 78211 |
2.76 |
| 2026-05-28 00:00 |
15:58:11.04 |
-15:25:50.3 |
HIP 78211 |
3.00 |
| 2026-05-28 12:00 |
15:58:08.80 |
-15:25:43.8 |
HIP 78211 |
3.31 |
| 2026-05-29 00:00 |
15:58:06.55 |
-15:25:37.3 |
HIP 78211 |
3.68 |
| 2026-05-29 12:00 |
15:58:04.31 |
-15:25:30.8 |
HIP 78211 |
4.09 |
| 2026-05-30 00:00 |
15:58:02.07 |
-15:25:24.4 |
HIP 78211 |
4.53 |
| 2026-05-30 12:00 |
15:57:59.83 |
-15:25:18.0 |
HIP 78211 |
4.99 |
| 2026-05-31 00:00 |
15:57:57.60 |
-15:25:11.6 |
HIP 78211 |
5.47 |
| 2026-05-31 12:00 |
15:57:55.36 |
-15:25:05.3 |
HIP 78211 |
5.96 |
| 2026-06-01 00:00 |
15:57:53.13 |
-15:24:59.0 |
HIP 78211 |
6.45 |
| 2026-06-01 12:00 |
15:57:50.91 |
-15:24:52.7 |
HIP 78211 |
6.96 |
| 2026-06-02 00:00 |
15:57:48.68 |
-15:24:46.4 |
HIP 78211 |
7.46 |