メタデータ
| 項目 |
値 |
| 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 |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| 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) |
- |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
15:54:34.84 |
-15:18:05.1 |
HIP 78010 |
19.20 |
| 2026-07-29 12:00 |
15:54:33.94 |
-15:18:04.9 |
HIP 78010 |
19.39 |
| 2026-07-30 00:00 |
15:54:33.05 |
-15:18:04.7 |
HIP 78010 |
19.58 |
| 2026-07-30 12:00 |
15:54:32.19 |
-15:18:04.6 |
HIP 78010 |
19.77 |
| 2026-07-31 00:00 |
15:54:31.34 |
-15:18:04.6 |
HIP 78010 |
19.96 |
| 2026-07-31 12:00 |
15:54:30.51 |
-15:18:04.6 |
HIP 77872 |
20.06 |
| 2026-08-01 00:00 |
15:54:29.69 |
-15:18:04.7 |
HIP 77872 |
20.01 |
| 2026-08-01 12:00 |
15:54:28.90 |
-15:18:04.9 |
HIP 77872 |
19.96 |
| 2026-08-02 00:00 |
15:54:28.12 |
-15:18:05.1 |
HIP 77872 |
19.92 |
| 2026-08-02 12:00 |
15:54:27.36 |
-15:18:05.4 |
HIP 77872 |
19.88 |
| 2026-08-03 00:00 |
15:54:26.62 |
-15:18:05.7 |
HIP 77872 |
19.84 |
| 2026-08-03 12:00 |
15:54:25.89 |
-15:18:06.1 |
HIP 77872 |
19.81 |
| 2026-08-04 00:00 |
15:54:25.19 |
-15:18:06.6 |
HIP 77872 |
19.78 |
| 2026-08-04 12:00 |
15:54:24.50 |
-15:18:07.1 |
HIP 77872 |
19.76 |
| 2026-08-05 00:00 |
15:54:23.83 |
-15:18:07.7 |
HIP 77872 |
19.73 |
| 2026-08-05 12:00 |
15:54:23.18 |
-15:18:08.3 |
HIP 77872 |
19.71 |
| 2026-08-06 00:00 |
15:54:22.54 |
-15:18:09.0 |
HIP 77872 |
19.70 |
| 2026-08-06 12:00 |
15:54:21.93 |
-15:18:09.8 |
HIP 77872 |
19.68 |
| 2026-08-07 00:00 |
15:54:21.33 |
-15:18:10.6 |
HIP 77872 |
19.67 |
| 2026-08-07 12:00 |
15:54:20.75 |
-15:18:11.5 |
HIP 77872 |
19.66 |
| 2026-08-08 00:00 |
15:54:20.19 |
-15:18:12.5 |
HIP 77872 |
19.66 |
| 2026-08-08 12:00 |
15:54:19.65 |
-15:18:13.5 |
HIP 77872 |
19.66 |
| 2026-08-09 00:00 |
15:54:19.12 |
-15:18:14.6 |
HIP 77872 |
19.66 |
| 2026-08-09 12:00 |
15:54:18.62 |
-15:18:15.8 |
HIP 77872 |
19.66 |
| 2026-08-10 00:00 |
15:54:18.13 |
-15:18:17.0 |
HIP 77872 |
19.66 |
| 2026-08-10 12:00 |
15:54:17.66 |
-15:18:18.2 |
HIP 77872 |
19.67 |
| 2026-08-11 00:00 |
15:54:17.21 |
-15:18:19.6 |
HIP 77872 |
19.68 |
| 2026-08-11 12:00 |
15:54:16.78 |
-15:18:21.0 |
HIP 77872 |
19.69 |
| 2026-08-12 00:00 |
15:54:16.37 |
-15:18:22.4 |
HIP 77872 |
19.70 |
| 2026-08-12 12:00 |
15:54:15.98 |
-15:18:23.9 |
HIP 77872 |
19.72 |
| 2026-08-13 00:00 |
15:54:15.60 |
-15:18:25.5 |
HIP 77872 |
19.74 |
| 2026-08-13 12:00 |
15:54:15.25 |
-15:18:27.2 |
HIP 77872 |
19.76 |
| 2026-08-14 00:00 |
15:54:14.91 |
-15:18:28.9 |
HIP 77872 |
19.78 |
| 2026-08-14 12:00 |
15:54:14.59 |
-15:18:30.6 |
HIP 77872 |
19.80 |
| 2026-08-15 00:00 |
15:54:14.29 |
-15:18:32.4 |
HIP 77872 |
19.82 |
| 2026-08-15 12:00 |
15:54:14.01 |
-15:18:34.3 |
HIP 77872 |
19.85 |
| 2026-08-16 00:00 |
15:54:13.75 |
-15:18:36.3 |
HIP 77872 |
19.88 |
| 2026-08-16 12:00 |
15:54:13.51 |
-15:18:38.3 |
HIP 77872 |
19.91 |
| 2026-08-17 00:00 |
15:54:13.29 |
-15:18:40.3 |
HIP 77872 |
19.94 |
| 2026-08-17 12:00 |
15:54:13.08 |
-15:18:42.4 |
HIP 77872 |
19.97 |
| 2026-08-18 00:00 |
15:54:12.90 |
-15:18:44.6 |
HIP 77872 |
20.00 |
| 2026-08-18 12:00 |
15:54:12.73 |
-15:18:46.9 |
HIP 77872 |
20.04 |
| 2026-08-19 00:00 |
15:54:12.58 |
-15:18:49.2 |
HIP 77872 |
20.07 |