メタデータ
| 項目 |
値 |
| Designation |
C/1997 L1 (Zhu-Balam) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1996-11-22T20:49:19.153920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:51Z |
| Obs used |
213 |
| NEO |
- |
| M1 |
6.500 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1997-08-22.0000000 |
| e |
0.99797377 |
| q (au) |
4.899563 |
| a (au) |
2418.066374 |
| i (deg) |
72.991461 |
| Ω (om, deg) |
233.299834 |
| ω (w, deg) |
346.364690 |
| M (ma, deg) |
0.002256 |
等級
散乱 + 全体線形
$$
M_a = (2.899 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
2.899 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
00:28:54.97 |
+55:23:38.0 |
HIP 2457 |
20.73 |
| 2026-06-01 12:00 |
00:28:56.98 |
+55:24:05.5 |
HIP 2457 |
20.58 |
| 2026-06-02 00:00 |
00:28:58.95 |
+55:24:33.0 |
HIP 2457 |
20.46 |
| 2026-06-02 12:00 |
00:29:00.90 |
+55:25:00.6 |
HIP 2457 |
20.35 |
| 2026-06-03 00:00 |
00:29:02.82 |
+55:25:28.3 |
HIP 2457 |
20.26 |
| 2026-06-03 12:00 |
00:29:04.71 |
+55:25:56.0 |
HIP 2457 |
20.19 |
| 2026-06-04 00:00 |
00:29:06.57 |
+55:26:23.7 |
HIP 2457 |
20.14 |
| 2026-06-04 12:00 |
00:29:08.41 |
+55:26:51.4 |
HIP 2457 |
20.10 |
| 2026-06-05 00:00 |
00:29:10.22 |
+55:27:19.2 |
HIP 2457 |
20.09 |
| 2026-06-05 12:00 |
00:29:11.99 |
+55:27:47.0 |
HIP 2457 |
20.09 |
| 2026-06-06 00:00 |
00:29:13.74 |
+55:28:14.9 |
HIP 2457 |
20.11 |
| 2026-06-06 12:00 |
00:29:15.46 |
+55:28:42.7 |
HIP 2457 |
20.14 |
| 2026-06-07 00:00 |
00:29:17.16 |
+55:29:10.6 |
HIP 2440 |
19.90 |
| 2026-06-07 12:00 |
00:29:18.82 |
+55:29:38.5 |
HIP 2440 |
19.42 |
| 2026-06-08 00:00 |
00:29:20.45 |
+55:30:06.5 |
HIP 2440 |
18.94 |
| 2026-06-08 12:00 |
00:29:22.06 |
+55:30:34.5 |
HIP 2440 |
18.47 |
| 2026-06-09 00:00 |
00:29:23.63 |
+55:31:02.4 |
HIP 2440 |
18.01 |
| 2026-06-09 12:00 |
00:29:25.18 |
+55:31:30.4 |
HIP 2440 |
17.55 |
| 2026-06-10 00:00 |
00:29:26.69 |
+55:31:58.5 |
HIP 2440 |
17.09 |
| 2026-06-10 12:00 |
00:29:28.18 |
+55:32:26.5 |
HIP 2440 |
16.65 |
| 2026-06-11 00:00 |
00:29:29.64 |
+55:32:54.5 |
HIP 2440 |
16.21 |
| 2026-06-11 12:00 |
00:29:31.06 |
+55:33:22.6 |
HIP 2440 |
15.78 |
| 2026-06-12 00:00 |
00:29:32.46 |
+55:33:50.6 |
HIP 2440 |
15.35 |
| 2026-06-12 12:00 |
00:29:33.82 |
+55:34:18.7 |
HIP 2440 |
14.94 |
| 2026-06-13 00:00 |
00:29:35.16 |
+55:34:46.7 |
HIP 2440 |
14.54 |
| 2026-06-13 12:00 |
00:29:36.46 |
+55:35:14.8 |
HIP 2440 |
14.14 |
| 2026-06-14 00:00 |
00:29:37.74 |
+55:35:42.9 |
HIP 2440 |
13.76 |
| 2026-06-14 12:00 |
00:29:38.98 |
+55:36:10.9 |
HIP 2440 |
13.39 |
| 2026-06-15 00:00 |
00:29:40.19 |
+55:36:39.0 |
HIP 2440 |
13.03 |
| 2026-06-15 12:00 |
00:29:41.37 |
+55:37:07.0 |
HIP 2440 |
12.68 |
| 2026-06-16 00:00 |
00:29:42.52 |
+55:37:35.1 |
HIP 2440 |
12.35 |
| 2026-06-16 12:00 |
00:29:43.64 |
+55:38:03.1 |
HIP 2440 |
12.04 |
| 2026-06-17 00:00 |
00:29:44.73 |
+55:38:31.1 |
HIP 2440 |
11.74 |
| 2026-06-17 12:00 |
00:29:45.79 |
+55:38:59.1 |
HIP 2440 |
11.46 |
| 2026-06-18 00:00 |
00:29:46.81 |
+55:39:27.0 |
HIP 2440 |
11.20 |
| 2026-06-18 12:00 |
00:29:47.81 |
+55:39:55.0 |
HIP 2440 |
10.96 |
| 2026-06-19 00:00 |
00:29:48.77 |
+55:40:22.9 |
HIP 2440 |
10.73 |
| 2026-06-19 12:00 |
00:29:49.70 |
+55:40:50.8 |
HIP 2440 |
10.54 |
| 2026-06-20 00:00 |
00:29:50.60 |
+55:41:18.7 |
HIP 2440 |
10.36 |
| 2026-06-20 12:00 |
00:29:51.47 |
+55:41:46.5 |
HIP 2440 |
10.21 |
| 2026-06-21 00:00 |
00:29:52.30 |
+55:42:14.3 |
HIP 2440 |
10.08 |
| 2026-06-21 12:00 |
00:29:53.11 |
+55:42:42.1 |
HIP 2440 |
9.98 |
| 2026-06-22 00:00 |
00:29:53.88 |
+55:43:09.9 |
HIP 2440 |
9.91 |