メタデータ
| 項目 |
値 |
| Designation |
C/1987 H1 (Shoemaker) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1986-11-17T00:37:43.749120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
126 |
| NEO |
- |
| M1 |
5.200 |
| K1 |
9.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1987-11-03.0000000 |
| e |
1.00321165 |
| q (au) |
5.457290 |
| a (au) |
-1699.216266 |
| i (deg) |
132.485156 |
| Ω (om, deg) |
268.336619 |
| ω (w, deg) |
16.992162 |
| M (ma, deg) |
0.004939 |
等級
散乱 + 全体線形
$$
M_a = (2.864 + 5.022\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.864 |
| n |
5.022 |
| gf |
0.980 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.814 |
| 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) |
| 2026-05-12 00:00 |
06:48:45.09 |
+36:10:25.9 |
HIP 32728 |
19.30 |
| 2026-05-12 12:00 |
06:48:46.49 |
+36:10:18.3 |
HIP 32728 |
19.25 |
| 2026-05-13 00:00 |
06:48:47.92 |
+36:10:10.6 |
HIP 32728 |
19.21 |
| 2026-05-13 12:00 |
06:48:49.35 |
+36:10:03.0 |
HIP 32728 |
19.17 |
| 2026-05-14 00:00 |
06:48:50.81 |
+36:09:55.4 |
HIP 32728 |
19.13 |
| 2026-05-14 12:00 |
06:48:52.27 |
+36:09:47.9 |
HIP 32728 |
19.09 |
| 2026-05-15 00:00 |
06:48:53.75 |
+36:09:40.4 |
HIP 32728 |
19.06 |
| 2026-05-15 12:00 |
06:48:55.25 |
+36:09:32.8 |
HIP 32728 |
19.03 |
| 2026-05-16 00:00 |
06:48:56.76 |
+36:09:25.4 |
HIP 32728 |
19.01 |
| 2026-05-16 12:00 |
06:48:58.29 |
+36:09:17.9 |
HIP 32728 |
18.99 |
| 2026-05-17 00:00 |
06:48:59.82 |
+36:09:10.5 |
HIP 32728 |
18.97 |
| 2026-05-17 12:00 |
06:49:01.38 |
+36:09:03.0 |
HIP 32728 |
18.96 |
| 2026-05-18 00:00 |
06:49:02.94 |
+36:08:55.7 |
HIP 32728 |
18.95 |
| 2026-05-18 12:00 |
06:49:04.52 |
+36:08:48.3 |
HIP 32728 |
18.95 |
| 2026-05-19 00:00 |
06:49:06.12 |
+36:08:41.0 |
HIP 32728 |
18.95 |
| 2026-05-19 12:00 |
06:49:07.73 |
+36:08:33.7 |
HIP 32728 |
18.96 |
| 2026-05-20 00:00 |
06:49:09.35 |
+36:08:26.4 |
HIP 32728 |
18.98 |
| 2026-05-20 12:00 |
06:49:10.98 |
+36:08:19.1 |
HIP 32728 |
18.99 |
| 2026-05-21 00:00 |
06:49:12.63 |
+36:08:11.9 |
HIP 32728 |
19.02 |
| 2026-05-21 12:00 |
06:49:14.29 |
+36:08:04.7 |
HIP 32728 |
19.04 |
| 2026-05-22 00:00 |
06:49:15.96 |
+36:07:57.5 |
HIP 32728 |
19.08 |
| 2026-05-22 12:00 |
06:49:17.65 |
+36:07:50.4 |
HIP 32728 |
19.12 |
| 2026-05-23 00:00 |
06:49:19.34 |
+36:07:43.3 |
HIP 32728 |
19.16 |
| 2026-05-23 12:00 |
06:49:21.05 |
+36:07:36.2 |
HIP 32728 |
19.21 |
| 2026-05-24 00:00 |
06:49:22.77 |
+36:07:29.2 |
HIP 32728 |
19.27 |
| 2026-05-24 12:00 |
06:49:24.51 |
+36:07:22.2 |
HIP 32862 |
19.01 |
| 2026-05-25 00:00 |
06:49:26.25 |
+36:07:15.2 |
HIP 32862 |
18.69 |
| 2026-05-25 12:00 |
06:49:28.01 |
+36:07:08.2 |
HIP 32862 |
18.37 |
| 2026-05-26 00:00 |
06:49:29.78 |
+36:07:01.3 |
HIP 32862 |
18.05 |
| 2026-05-26 12:00 |
06:49:31.56 |
+36:06:54.4 |
HIP 32862 |
17.73 |
| 2026-05-27 00:00 |
06:49:33.35 |
+36:06:47.6 |
HIP 32862 |
17.41 |
| 2026-05-27 12:00 |
06:49:35.16 |
+36:06:40.8 |
HIP 32862 |
17.09 |
| 2026-05-28 00:00 |
06:49:36.97 |
+36:06:34.0 |
HIP 32862 |
16.76 |
| 2026-05-28 12:00 |
06:49:38.80 |
+36:06:27.2 |
HIP 32862 |
16.44 |
| 2026-05-29 00:00 |
06:49:40.63 |
+36:06:20.5 |
HIP 32862 |
16.12 |
| 2026-05-29 12:00 |
06:49:42.48 |
+36:06:13.8 |
HIP 32862 |
15.80 |
| 2026-05-30 00:00 |
06:49:44.34 |
+36:06:07.1 |
HIP 32862 |
15.49 |
| 2026-05-30 12:00 |
06:49:46.20 |
+36:06:00.5 |
HIP 32862 |
15.17 |
| 2026-05-31 00:00 |
06:49:48.08 |
+36:05:53.9 |
HIP 32862 |
14.85 |
| 2026-05-31 12:00 |
06:49:49.97 |
+36:05:47.4 |
HIP 32862 |
14.54 |
| 2026-06-01 00:00 |
06:49:51.87 |
+36:05:40.9 |
HIP 32862 |
14.23 |
| 2026-06-01 12:00 |
06:49:53.78 |
+36:05:34.4 |
HIP 32862 |
13.92 |
| 2026-06-02 00:00 |
06:49:55.69 |
+36:05:28.0 |
HIP 32862 |
13.61 |