メタデータ
| 項目 |
値 |
| Designation |
C/1988 L1 (Shoemaker-Holt-Rodriquez) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1989-06-12T11:09:22.452480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
155 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
4.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1988-11-06.0000000 |
| e |
1.00067716 |
| q (au) |
2.474297 |
| a (au) |
-3653.923503 |
| i (deg) |
97.688560 |
| Ω (om, deg) |
115.255065 |
| ω (w, deg) |
232.145920 |
| M (ma, deg) |
-0.000975 |
等級
散乱 + 全体線形
$$
M_a = (7.401 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.401 |
| n |
2.000 |
| gf |
0.995 |
| gb |
-0.685 |
| k |
0.999 |
| δ90 |
9.990 |
| 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) |
| 2026-09-20 00:00 |
08:02:09.60 |
+49:32:47.6 |
HIP 39167 |
17.08 |
| 2026-09-20 12:00 |
08:02:11.09 |
+49:32:58.3 |
HIP 39167 |
17.38 |
| 2026-09-21 00:00 |
08:02:12.56 |
+49:33:09.1 |
HIP 39167 |
17.68 |
| 2026-09-21 12:00 |
08:02:14.01 |
+49:33:20.0 |
HIP 39167 |
17.98 |
| 2026-09-22 00:00 |
08:02:15.44 |
+49:33:30.9 |
HIP 39167 |
18.27 |
| 2026-09-22 12:00 |
08:02:16.85 |
+49:33:42.0 |
HIP 39167 |
18.56 |
| 2026-09-23 00:00 |
08:02:18.24 |
+49:33:53.2 |
HIP 39167 |
18.85 |
| 2026-09-23 12:00 |
08:02:19.60 |
+49:34:04.5 |
HIP 39167 |
19.14 |
| 2026-09-24 00:00 |
08:02:20.95 |
+49:34:15.9 |
HIP 39167 |
19.43 |
| 2026-09-24 12:00 |
08:02:22.27 |
+49:34:27.3 |
HIP 39167 |
19.71 |
| 2026-09-25 00:00 |
08:02:23.57 |
+49:34:38.9 |
HIP 39167 |
19.99 |
| 2026-09-25 12:00 |
08:02:24.85 |
+49:34:50.6 |
HIP 39167 |
20.27 |
| 2026-09-26 00:00 |
08:02:26.10 |
+49:35:02.3 |
HIP 39167 |
20.55 |
| 2026-09-26 12:00 |
08:02:27.34 |
+49:35:14.2 |
HIP 39167 |
20.83 |
| 2026-09-27 00:00 |
08:02:28.55 |
+49:35:26.1 |
HIP 39167 |
21.10 |
| 2026-09-27 12:00 |
08:02:29.74 |
+49:35:38.2 |
HIP 39167 |
21.37 |
| 2026-09-28 00:00 |
08:02:30.90 |
+49:35:50.3 |
HIP 39167 |
21.64 |
| 2026-09-28 12:00 |
08:02:32.05 |
+49:36:02.5 |
HIP 39167 |
21.91 |
| 2026-09-29 00:00 |
08:02:33.17 |
+49:36:14.8 |
HIP 39167 |
22.17 |
| 2026-09-29 12:00 |
08:02:34.27 |
+49:36:27.2 |
HIP 39167 |
22.44 |
| 2026-09-30 00:00 |
08:02:35.34 |
+49:36:39.7 |
HIP 39167 |
22.70 |
| 2026-09-30 12:00 |
08:02:36.40 |
+49:36:52.3 |
HIP 39167 |
22.96 |
| 2026-10-01 00:00 |
08:02:37.43 |
+49:37:05.0 |
HIP 39167 |
23.22 |
| 2026-10-01 12:00 |
08:02:38.43 |
+49:37:17.7 |
HIP 39167 |
23.47 |
| 2026-10-02 00:00 |
08:02:39.42 |
+49:37:30.6 |
HIP 39167 |
23.73 |
| 2026-10-02 12:00 |
08:02:40.38 |
+49:37:43.5 |
HIP 39167 |
23.98 |
| 2026-10-03 00:00 |
08:02:41.31 |
+49:37:56.5 |
HIP 39167 |
24.23 |
| 2026-10-03 12:00 |
08:02:42.22 |
+49:38:09.6 |
HIP 39167 |
24.47 |
| 2026-10-04 00:00 |
08:02:43.11 |
+49:38:22.8 |
HIP 39167 |
24.72 |
| 2026-10-04 12:00 |
08:02:43.98 |
+49:38:36.0 |
HIP 39167 |
24.96 |
| 2026-10-05 00:00 |
08:02:44.82 |
+49:38:49.4 |
HIP 39167 |
25.21 |
| 2026-10-05 12:00 |
08:02:45.64 |
+49:39:02.8 |
HIP 39167 |
25.45 |
| 2026-10-06 00:00 |
08:02:46.43 |
+49:39:16.3 |
HIP 39167 |
25.68 |
| 2026-10-06 12:00 |
08:02:47.20 |
+49:39:29.9 |
HIP 39167 |
25.92 |
| 2026-10-07 00:00 |
08:02:47.94 |
+49:39:43.6 |
HIP 39167 |
26.15 |
| 2026-10-07 12:00 |
08:02:48.66 |
+49:39:57.4 |
HIP 39167 |
26.39 |
| 2026-10-08 00:00 |
08:02:49.36 |
+49:40:11.2 |
HIP 39167 |
26.62 |
| 2026-10-08 12:00 |
08:02:50.03 |
+49:40:25.1 |
HIP 39167 |
26.85 |
| 2026-10-09 00:00 |
08:02:50.68 |
+49:40:39.1 |
HIP 39167 |
27.07 |
| 2026-10-09 12:00 |
08:02:51.30 |
+49:40:53.1 |
HIP 39167 |
27.30 |
| 2026-10-10 00:00 |
08:02:51.90 |
+49:41:07.3 |
HIP 39167 |
27.52 |
| 2026-10-10 12:00 |
08:02:52.47 |
+49:41:21.5 |
HIP 39167 |
27.74 |
| 2026-10-11 00:00 |
08:02:53.02 |
+49:41:35.7 |
HIP 39167 |
27.96 |