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
$$
M_a = (2.870 + 5.022\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.870 |
| n |
5.022 |
| gf |
0.969 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.415 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
06:49:57.62 |
+36:05:21.6 |
HIP 32862 |
13.30 |
| 2026-06-03 00:00 |
06:49:59.56 |
+36:05:15.2 |
HIP 32862 |
13.00 |
| 2026-06-03 12:00 |
06:50:01.50 |
+36:05:08.9 |
HIP 32862 |
12.71 |
| 2026-06-04 00:00 |
06:50:03.46 |
+36:05:02.6 |
HIP 32862 |
12.41 |
| 2026-06-04 12:00 |
06:50:05.42 |
+36:04:56.3 |
HIP 32862 |
12.13 |
| 2026-06-05 00:00 |
06:50:07.40 |
+36:04:50.1 |
HIP 32862 |
11.84 |
| 2026-06-05 12:00 |
06:50:09.38 |
+36:04:43.9 |
HIP 32862 |
11.57 |
| 2026-06-06 00:00 |
06:50:11.37 |
+36:04:37.8 |
HIP 32862 |
11.30 |
| 2026-06-06 12:00 |
06:50:13.37 |
+36:04:31.7 |
HIP 32862 |
11.04 |
| 2026-06-07 00:00 |
06:50:15.38 |
+36:04:25.6 |
HIP 32862 |
10.78 |
| 2026-06-07 12:00 |
06:50:17.39 |
+36:04:19.6 |
HIP 32862 |
10.53 |
| 2026-06-08 00:00 |
06:50:19.42 |
+36:04:13.6 |
HIP 32862 |
10.30 |
| 2026-06-08 12:00 |
06:50:21.45 |
+36:04:07.7 |
HIP 32862 |
10.07 |
| 2026-06-09 00:00 |
06:50:23.49 |
+36:04:01.8 |
HIP 32862 |
9.86 |
| 2026-06-09 12:00 |
06:50:25.54 |
+36:03:55.9 |
HIP 32862 |
9.65 |
| 2026-06-10 00:00 |
06:50:27.59 |
+36:03:50.1 |
HIP 32862 |
9.46 |
| 2026-06-10 12:00 |
06:50:29.66 |
+36:03:44.3 |
HIP 32862 |
9.29 |
| 2026-06-11 00:00 |
06:50:31.73 |
+36:03:38.6 |
HIP 32862 |
9.13 |
| 2026-06-11 12:00 |
06:50:33.80 |
+36:03:32.9 |
HIP 32862 |
8.99 |
| 2026-06-12 00:00 |
06:50:35.89 |
+36:03:27.2 |
HIP 32862 |
8.86 |
| 2026-06-12 12:00 |
06:50:37.98 |
+36:03:21.6 |
HIP 32862 |
8.75 |
| 2026-06-13 00:00 |
06:50:40.08 |
+36:03:16.0 |
HIP 32862 |
8.66 |
| 2026-06-13 12:00 |
06:50:42.18 |
+36:03:10.5 |
HIP 32862 |
8.59 |
| 2026-06-14 00:00 |
06:50:44.29 |
+36:03:05.0 |
HIP 32862 |
8.55 |
| 2026-06-14 12:00 |
06:50:46.41 |
+36:02:59.6 |
HIP 32862 |
8.52 |
| 2026-06-15 00:00 |
06:50:48.53 |
+36:02:54.2 |
HIP 32862 |
8.51 |
| 2026-06-15 12:00 |
06:50:50.66 |
+36:02:48.8 |
HIP 32862 |
8.53 |
| 2026-06-16 00:00 |
06:50:52.79 |
+36:02:43.5 |
HIP 32862 |
8.56 |
| 2026-06-16 12:00 |
06:50:54.93 |
+36:02:38.2 |
HIP 32862 |
8.62 |
| 2026-06-17 00:00 |
06:50:57.08 |
+36:02:33.0 |
HIP 32862 |
8.70 |
| 2026-06-17 12:00 |
06:50:59.23 |
+36:02:27.9 |
HIP 32862 |
8.80 |
| 2026-06-18 00:00 |
06:51:01.38 |
+36:02:22.7 |
HIP 32862 |
8.92 |
| 2026-06-18 12:00 |
06:51:03.54 |
+36:02:17.6 |
HIP 32862 |
9.07 |
| 2026-06-19 00:00 |
06:51:05.71 |
+36:02:12.6 |
HIP 32862 |
9.22 |
| 2026-06-19 12:00 |
06:51:07.88 |
+36:02:07.6 |
HIP 32862 |
9.40 |
| 2026-06-20 00:00 |
06:51:10.05 |
+36:02:02.7 |
HIP 32862 |
9.60 |
| 2026-06-20 12:00 |
06:51:12.23 |
+36:01:57.8 |
HIP 32862 |
9.81 |
| 2026-06-21 00:00 |
06:51:14.41 |
+36:01:52.9 |
HIP 32862 |
10.03 |
| 2026-06-21 12:00 |
06:51:16.60 |
+36:01:48.1 |
HIP 32862 |
10.27 |
| 2026-06-22 00:00 |
06:51:18.79 |
+36:01:43.4 |
HIP 32862 |
10.52 |