メタデータ
| 項目 |
値 |
| Designation |
481P/Lemmon-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-01-20T09:40:11.303040Z |
| Orbit solution date (soln_date, UTC) |
2025-01-02T20:13:07Z |
| Obs used |
58 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
8.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-02-12T23:21:45.216000Z |
| Discovery magnitude (MPC) |
20.20 G |
| Discovery observatory (MPC) |
J04 · ESA Optical Ground Station, Tenerife |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-02-02.0000000 |
| e |
0.33653656 |
| q (au) |
3.174489 |
| a (au) |
4.784723 |
| i (deg) |
6.121394 |
| Ω (om, deg) |
94.508201 |
| ω (w, deg) |
352.744493 |
| M (ma, deg) |
173.143194 |
等級
散乱 + 全体線形
$$
M_a = (10.456 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.456 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.536 |
| 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) |
| 2026-07-29 00:00 |
14:35:21.30 |
-10:40:58.6 |
HIP 71290 |
14.68 |
| 2026-07-29 12:00 |
14:35:27.22 |
-10:42:00.3 |
HIP 71290 |
14.87 |
| 2026-07-30 00:00 |
14:35:33.28 |
-10:43:02.7 |
HIP 71290 |
15.28 |
| 2026-07-30 12:00 |
14:35:39.50 |
-10:44:05.7 |
HIP 71290 |
15.92 |
| 2026-07-31 00:00 |
14:35:45.88 |
-10:45:09.3 |
HIP 71290 |
16.77 |
| 2026-07-31 12:00 |
14:35:52.40 |
-10:46:13.6 |
HIP 71290 |
17.81 |
| 2026-08-01 00:00 |
14:35:59.08 |
-10:47:18.5 |
HIP 71290 |
19.02 |
| 2026-08-01 12:00 |
14:36:05.91 |
-10:48:24.0 |
HIP 71290 |
20.38 |
| 2026-08-02 00:00 |
14:36:12.89 |
-10:49:30.1 |
HIP 71290 |
21.88 |
| 2026-08-02 12:00 |
14:36:20.02 |
-10:50:36.8 |
HIP 71290 |
23.49 |
| 2026-08-03 00:00 |
14:36:27.30 |
-10:51:44.1 |
HIP 71290 |
25.21 |
| 2026-08-03 12:00 |
14:36:34.73 |
-10:52:52.0 |
HIP 71290 |
27.02 |
| 2026-08-04 00:00 |
14:36:42.30 |
-10:54:00.5 |
HIP 71290 |
28.92 |
| 2026-08-04 12:00 |
14:36:50.03 |
-10:55:09.6 |
HIP 71290 |
30.88 |
| 2026-08-05 00:00 |
14:36:57.90 |
-10:56:19.3 |
HIP 71375 |
32.88 |
| 2026-08-05 12:00 |
14:37:05.92 |
-10:57:29.5 |
HIP 71375 |
33.01 |
| 2026-08-06 00:00 |
14:37:14.09 |
-10:58:40.3 |
HIP 71375 |
33.31 |
| 2026-08-06 12:00 |
14:37:22.40 |
-10:59:51.7 |
HIP 71375 |
33.79 |
| 2026-08-07 00:00 |
14:37:30.86 |
-11:01:03.7 |
HIP 71375 |
34.44 |
| 2026-08-07 12:00 |
14:37:39.46 |
-11:02:16.2 |
HIP 71632 |
35.15 |
| 2026-08-08 00:00 |
14:37:48.21 |
-11:03:29.3 |
HIP 71632 |
35.02 |
| 2026-08-08 12:00 |
14:37:57.10 |
-11:04:43.0 |
HIP 71632 |
35.06 |
| 2026-08-09 00:00 |
14:38:06.14 |
-11:05:57.1 |
HIP 71646 |
34.31 |
| 2026-08-09 12:00 |
14:38:15.31 |
-11:07:11.9 |
HIP 71646 |
32.13 |
| 2026-08-10 00:00 |
14:38:24.64 |
-11:08:27.1 |
HIP 71646 |
30.00 |
| 2026-08-10 12:00 |
14:38:34.10 |
-11:09:42.9 |
HIP 71646 |
27.92 |
| 2026-08-11 00:00 |
14:38:43.70 |
-11:10:59.3 |
HIP 71646 |
25.93 |
| 2026-08-11 12:00 |
14:38:53.44 |
-11:12:16.1 |
HIP 71646 |
24.05 |
| 2026-08-12 00:00 |
14:39:03.33 |
-11:13:33.5 |
HIP 71646 |
22.34 |
| 2026-08-12 12:00 |
14:39:13.35 |
-11:14:51.4 |
HIP 71646 |
20.83 |
| 2026-08-13 00:00 |
14:39:23.51 |
-11:16:09.7 |
HIP 71646 |
19.60 |
| 2026-08-13 12:00 |
14:39:33.81 |
-11:17:28.6 |
HIP 71646 |
18.71 |
| 2026-08-14 00:00 |
14:39:44.25 |
-11:18:48.0 |
HIP 71646 |
18.24 |
| 2026-08-14 12:00 |
14:39:54.82 |
-11:20:07.9 |
HIP 71646 |
18.22 |
| 2026-08-15 00:00 |
14:40:05.53 |
-11:21:28.2 |
HIP 71808 |
18.02 |
| 2026-08-15 12:00 |
14:40:16.37 |
-11:22:49.1 |
HIP 71808 |
15.38 |
| 2026-08-16 00:00 |
14:40:27.35 |
-11:24:10.4 |
HIP 71808 |
12.87 |
| 2026-08-16 12:00 |
14:40:38.46 |
-11:25:32.1 |
HIP 71808 |
10.60 |
| 2026-08-17 00:00 |
14:40:49.70 |
-11:26:54.3 |
HIP 71808 |
8.78 |
| 2026-08-17 12:00 |
14:41:01.07 |
-11:28:17.0 |
HIP 71808 |
7.79 |
| 2026-08-18 00:00 |
14:41:12.58 |
-11:29:40.1 |
HIP 71808 |
7.97 |
| 2026-08-18 12:00 |
14:41:24.21 |
-11:31:03.7 |
HIP 71808 |
9.29 |
| 2026-08-19 00:00 |
14:41:35.98 |
-11:32:27.7 |
HIP 71808 |
11.39 |