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) |
| 2026-07-29 00:00 |
06:54:00.52 |
+35:58:14.8 |
HIP 33044 |
15.92 |
| 2026-07-29 12:00 |
06:54:02.56 |
+35:58:14.1 |
HIP 33044 |
16.21 |
| 2026-07-30 00:00 |
06:54:04.58 |
+35:58:13.4 |
HIP 33044 |
16.51 |
| 2026-07-30 12:00 |
06:54:06.60 |
+35:58:12.7 |
HIP 33044 |
16.81 |
| 2026-07-31 00:00 |
06:54:08.62 |
+35:58:12.1 |
HIP 33044 |
17.12 |
| 2026-07-31 12:00 |
06:54:10.62 |
+35:58:11.6 |
HIP 33044 |
17.43 |
| 2026-08-01 00:00 |
06:54:12.61 |
+35:58:11.1 |
HIP 33044 |
17.74 |
| 2026-08-01 12:00 |
06:54:14.60 |
+35:58:10.7 |
HIP 33044 |
18.05 |
| 2026-08-02 00:00 |
06:54:16.58 |
+35:58:10.3 |
HIP 33044 |
18.37 |
| 2026-08-02 12:00 |
06:54:18.55 |
+35:58:10.0 |
HIP 33044 |
18.69 |
| 2026-08-03 00:00 |
06:54:20.51 |
+35:58:09.7 |
HIP 33044 |
19.01 |
| 2026-08-03 12:00 |
06:54:22.46 |
+35:58:09.5 |
HIP 33044 |
19.34 |
| 2026-08-04 00:00 |
06:54:24.40 |
+35:58:09.4 |
HIP 33044 |
19.66 |
| 2026-08-04 12:00 |
06:54:26.34 |
+35:58:09.3 |
HIP 33044 |
19.99 |
| 2026-08-05 00:00 |
06:54:28.26 |
+35:58:09.3 |
HIP 33044 |
20.32 |
| 2026-08-05 12:00 |
06:54:30.18 |
+35:58:09.3 |
HIP 33044 |
20.65 |
| 2026-08-06 00:00 |
06:54:32.08 |
+35:58:09.4 |
HIP 33044 |
20.98 |
| 2026-08-06 12:00 |
06:54:33.98 |
+35:58:09.6 |
HIP 33044 |
21.31 |
| 2026-08-07 00:00 |
06:54:35.86 |
+35:58:09.8 |
HIP 33044 |
21.64 |
| 2026-08-07 12:00 |
06:54:37.74 |
+35:58:10.0 |
HIP 33044 |
21.97 |
| 2026-08-08 00:00 |
06:54:39.60 |
+35:58:10.3 |
HIP 33044 |
22.30 |
| 2026-08-08 12:00 |
06:54:41.45 |
+35:58:10.7 |
HIP 33044 |
22.63 |
| 2026-08-09 00:00 |
06:54:43.30 |
+35:58:11.1 |
HIP 33044 |
22.96 |
| 2026-08-09 12:00 |
06:54:45.13 |
+35:58:11.6 |
HIP 33044 |
23.29 |
| 2026-08-10 00:00 |
06:54:46.95 |
+35:58:12.1 |
HIP 33329 |
23.59 |
| 2026-08-10 12:00 |
06:54:48.76 |
+35:58:12.7 |
HIP 33329 |
23.39 |
| 2026-08-11 00:00 |
06:54:50.56 |
+35:58:13.4 |
HIP 33329 |
23.19 |
| 2026-08-11 12:00 |
06:54:52.35 |
+35:58:14.1 |
HIP 33329 |
23.00 |
| 2026-08-12 00:00 |
06:54:54.13 |
+35:58:14.9 |
HIP 33329 |
22.82 |
| 2026-08-12 12:00 |
06:54:55.90 |
+35:58:15.7 |
HIP 33329 |
22.64 |
| 2026-08-13 00:00 |
06:54:57.65 |
+35:58:16.5 |
HIP 33329 |
22.47 |
| 2026-08-13 12:00 |
06:54:59.39 |
+35:58:17.5 |
HIP 33329 |
22.31 |
| 2026-08-14 00:00 |
06:55:01.12 |
+35:58:18.5 |
HIP 33329 |
22.15 |
| 2026-08-14 12:00 |
06:55:02.84 |
+35:58:19.5 |
HIP 33329 |
22.00 |
| 2026-08-15 00:00 |
06:55:04.54 |
+35:58:20.6 |
HIP 33329 |
21.85 |
| 2026-08-15 12:00 |
06:55:06.24 |
+35:58:21.8 |
HIP 33329 |
21.71 |
| 2026-08-16 00:00 |
06:55:07.92 |
+35:58:23.0 |
HIP 33329 |
21.58 |
| 2026-08-16 12:00 |
06:55:09.58 |
+35:58:24.3 |
HIP 33329 |
21.45 |
| 2026-08-17 00:00 |
06:55:11.24 |
+35:58:25.6 |
HIP 33329 |
21.34 |
| 2026-08-17 12:00 |
06:55:12.88 |
+35:58:27.0 |
HIP 33329 |
21.22 |
| 2026-08-18 00:00 |
06:55:14.51 |
+35:58:28.4 |
HIP 33329 |
21.12 |
| 2026-08-18 12:00 |
06:55:16.13 |
+35:58:29.9 |
HIP 33329 |
21.02 |
| 2026-08-19 00:00 |
06:55:17.73 |
+35:58:31.4 |
HIP 33329 |
20.92 |