481P/Lemmon-PANSTARRS
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 |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-02-03 00:00 |
15:12:20.51 |
-12:41:13.8 |
HIP 74430 |
18.67 |
| 2026-02-03 12:00 |
15:12:31.04 |
-12:41:35.8 |
HIP 74430 |
18.53 |
| 2026-02-04 00:00 |
15:12:41.40 |
-12:41:57.1 |
HIP 74430 |
18.73 |
| 2026-02-04 12:00 |
15:12:51.59 |
-12:42:17.6 |
HIP 74430 |
19.25 |
| 2026-02-05 00:00 |
15:13:01.62 |
-12:42:37.3 |
HIP 74430 |
20.05 |
| 2026-02-05 12:00 |
15:13:11.47 |
-12:42:56.2 |
HIP 74430 |
21.08 |
| 2026-02-06 00:00 |
15:13:21.16 |
-12:43:14.4 |
HIP 74533 |
21.38 |
| 2026-02-06 12:00 |
15:13:30.68 |
-12:43:31.8 |
HIP 74533 |
21.10 |
| 2026-02-07 00:00 |
15:13:40.02 |
-12:43:48.4 |
HIP 74533 |
21.06 |
| 2026-02-07 12:00 |
15:13:49.19 |
-12:44:04.2 |
HIP 74533 |
21.26 |
| 2026-02-08 00:00 |
15:13:58.19 |
-12:44:19.2 |
HIP 74533 |
21.67 |
| 2026-02-08 12:00 |
15:14:07.01 |
-12:44:33.4 |
HIP 74533 |
22.27 |
| 2026-02-09 00:00 |
15:14:15.66 |
-12:44:46.9 |
HIP 74533 |
23.04 |
| 2026-02-09 12:00 |
15:14:24.13 |
-12:44:59.6 |
HIP 74533 |
23.94 |
| 2026-02-10 00:00 |
15:14:32.42 |
-12:45:11.5 |
HIP 74533 |
24.95 |
| 2026-02-10 12:00 |
15:14:40.54 |
-12:45:22.6 |
HIP 74533 |
26.05 |
| 2026-02-11 00:00 |
15:14:48.48 |
-12:45:32.9 |
HIP 74533 |
27.22 |
| 2026-02-11 12:00 |
15:14:56.24 |
-12:45:42.4 |
HIP 74533 |
28.43 |
| 2026-02-12 00:00 |
15:15:03.81 |
-12:45:51.2 |
HIP 74533 |
29.68 |
| 2026-02-12 12:00 |
15:15:11.21 |
-12:45:59.2 |
HIP 74765 |
28.83 |
| 2026-02-13 00:00 |
15:15:18.43 |
-12:46:06.4 |
HIP 74765 |
27.33 |
| 2026-02-13 12:00 |
15:15:25.46 |
-12:46:12.8 |
HIP 74765 |
25.90 |
| 2026-02-14 00:00 |
15:15:32.31 |
-12:46:18.4 |
HIP 74765 |
24.56 |
| 2026-02-14 12:00 |
15:15:38.98 |
-12:46:23.3 |
HIP 74765 |
23.29 |
| 2026-02-15 00:00 |
15:15:45.46 |
-12:46:27.4 |
HIP 74765 |
22.12 |
| 2026-02-15 12:00 |
15:15:51.76 |
-12:46:30.7 |
HIP 74765 |
21.04 |
| 2026-02-16 00:00 |
15:15:57.87 |
-12:46:33.2 |
HIP 74765 |
20.06 |
| 2026-02-16 12:00 |
15:16:03.79 |
-12:46:35.0 |
HIP 74765 |
19.18 |
| 2026-02-17 00:00 |
15:16:09.53 |
-12:46:35.9 |
HIP 74765 |
18.41 |
| 2026-02-17 12:00 |
15:16:15.08 |
-12:46:36.1 |
HIP 74765 |
17.74 |
| 2026-02-18 00:00 |
15:16:20.44 |
-12:46:35.6 |
HIP 74765 |
17.19 |
| 2026-02-18 12:00 |
15:16:25.61 |
-12:46:34.2 |
HIP 74765 |
16.75 |
| 2026-02-19 00:00 |
15:16:30.59 |
-12:46:32.1 |
HIP 74765 |
16.41 |
| 2026-02-19 12:00 |
15:16:35.38 |
-12:46:29.3 |
HIP 74765 |
16.19 |
| 2026-02-20 00:00 |
15:16:39.98 |
-12:46:25.6 |
HIP 74765 |
16.06 |
| 2026-02-20 12:00 |
15:16:44.39 |
-12:46:21.2 |
HIP 74765 |
16.03 |
| 2026-02-21 00:00 |
15:16:48.61 |
-12:46:16.0 |
HIP 74765 |
16.08 |
| 2026-02-21 12:00 |
15:16:52.64 |
-12:46:10.1 |
HIP 74765 |
16.21 |
| 2026-02-22 00:00 |
15:16:56.47 |
-12:46:03.4 |
HIP 74765 |
16.41 |
| 2026-02-22 12:00 |
15:17:00.12 |
-12:45:56.0 |
HIP 74765 |
16.66 |
| 2026-02-23 00:00 |
15:17:03.57 |
-12:45:47.8 |
HIP 74765 |
16.95 |
| 2026-02-23 12:00 |
15:17:06.83 |
-12:45:38.9 |
HIP 74765 |
17.28 |
| 2026-02-24 00:00 |
15:17:09.89 |
-12:45:29.2 |
HIP 74765 |
17.65 |