メタデータ
| 項目 |
値 |
| Designation |
292P/Li |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-02-06T08:53:58.968960Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:14:15Z |
| Obs used |
498 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
13.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-05-04.0000000 |
| e |
0.58678712 |
| q (au) |
2.535007 |
| a (au) |
6.134869 |
| i (deg) |
24.316162 |
| Ω (om, deg) |
91.860435 |
| ω (w, deg) |
318.847932 |
| M (ma, deg) |
247.179418 |
等級
散乱 + 全体線形
$$
M_a = (8.075 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.075 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2013-05-09 |
2014-02-01 |
+14.5124 |
-5.970 |
| 2014-02-06 |
2018-04-23 |
-1.1227 |
+0.220 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
18:19:58.52 |
-27:38:45.1 |
HIP 89871 |
15.15 |
| 2026-07-29 12:00 |
18:19:44.82 |
-27:39:20.4 |
HIP 89871 |
16.92 |
| 2026-07-30 00:00 |
18:19:31.24 |
-27:39:55.4 |
HIP 89871 |
19.01 |
| 2026-07-30 12:00 |
18:19:17.76 |
-27:40:30.0 |
HIP 89871 |
21.32 |
| 2026-07-31 00:00 |
18:19:04.41 |
-27:41:04.3 |
HIP 89871 |
23.78 |
| 2026-07-31 12:00 |
18:18:51.17 |
-27:41:38.3 |
HIP 89625 |
22.34 |
| 2026-08-01 00:00 |
18:18:38.05 |
-27:42:12.0 |
HIP 89625 |
20.26 |
| 2026-08-01 12:00 |
18:18:25.05 |
-27:42:45.4 |
HIP 89625 |
18.45 |
| 2026-08-02 00:00 |
18:18:12.18 |
-27:43:18.4 |
HIP 89592 |
16.53 |
| 2026-08-02 12:00 |
18:17:59.42 |
-27:43:51.1 |
HIP 89592 |
13.74 |
| 2026-08-03 00:00 |
18:17:46.80 |
-27:44:23.5 |
HIP 89592 |
11.01 |
| 2026-08-03 12:00 |
18:17:34.30 |
-27:44:55.6 |
HIP 89592 |
8.38 |
| 2026-08-04 00:00 |
18:17:21.93 |
-27:45:27.4 |
HIP 89592 |
5.97 |
| 2026-08-04 12:00 |
18:17:09.69 |
-27:45:58.8 |
HIP 89592 |
4.07 |
| 2026-08-05 00:00 |
18:16:57.58 |
-27:46:30.0 |
HIP 89592 |
3.56 |
| 2026-08-05 12:00 |
18:16:45.61 |
-27:47:00.9 |
HIP 89592 |
4.85 |
| 2026-08-06 00:00 |
18:16:33.77 |
-27:47:31.4 |
HIP 89592 |
6.97 |
| 2026-08-06 12:00 |
18:16:22.07 |
-27:48:01.7 |
HIP 89592 |
9.35 |
| 2026-08-07 00:00 |
18:16:10.51 |
-27:48:31.6 |
HIP 89592 |
11.80 |
| 2026-08-07 12:00 |
18:15:59.08 |
-27:49:01.3 |
HIP 89592 |
14.28 |
| 2026-08-08 00:00 |
18:15:47.80 |
-27:49:30.6 |
HIP 89592 |
16.76 |
| 2026-08-08 12:00 |
18:15:36.66 |
-27:49:59.7 |
HIP 89396 |
15.93 |
| 2026-08-09 00:00 |
18:15:25.67 |
-27:50:28.5 |
HIP 89396 |
13.67 |
| 2026-08-09 12:00 |
18:15:14.82 |
-27:50:57.0 |
HIP 89396 |
11.54 |
| 2026-08-10 00:00 |
18:15:04.12 |
-27:51:25.2 |
HIP 89396 |
9.57 |
| 2026-08-10 12:00 |
18:14:53.56 |
-27:51:53.1 |
HIP 89396 |
7.88 |
| 2026-08-11 00:00 |
18:14:43.16 |
-27:52:20.8 |
HIP 89396 |
6.64 |
| 2026-08-11 12:00 |
18:14:32.91 |
-27:52:48.1 |
HIP 89396 |
6.08 |
| 2026-08-12 00:00 |
18:14:22.81 |
-27:53:15.2 |
HIP 89396 |
6.35 |
| 2026-08-12 12:00 |
18:14:12.87 |
-27:53:42.0 |
HIP 89396 |
7.34 |
| 2026-08-13 00:00 |
18:14:03.08 |
-27:54:08.6 |
HIP 89396 |
8.77 |
| 2026-08-13 12:00 |
18:13:53.45 |
-27:54:34.8 |
HIP 89396 |
10.44 |
| 2026-08-14 00:00 |
18:13:43.98 |
-27:55:00.9 |
HIP 89396 |
12.24 |
| 2026-08-14 12:00 |
18:13:34.67 |
-27:55:26.6 |
HIP 89396 |
14.10 |
| 2026-08-15 00:00 |
18:13:25.51 |
-27:55:52.1 |
HIP 89396 |
15.98 |
| 2026-08-15 12:00 |
18:13:16.52 |
-27:56:17.3 |
HIP 89396 |
17.87 |
| 2026-08-16 00:00 |
18:13:07.69 |
-27:56:42.3 |
HIP 89238 |
18.69 |
| 2026-08-16 12:00 |
18:12:59.03 |
-27:57:07.0 |
HIP 89238 |
17.70 |
| 2026-08-17 00:00 |
18:12:50.52 |
-27:57:31.5 |
HIP 89238 |
16.90 |
| 2026-08-17 12:00 |
18:12:42.19 |
-27:57:55.7 |
HIP 89238 |
16.28 |
| 2026-08-18 00:00 |
18:12:34.02 |
-27:58:19.7 |
HIP 89238 |
15.87 |
| 2026-08-18 12:00 |
18:12:26.01 |
-27:58:43.5 |
HIP 89238 |
15.66 |
| 2026-08-19 00:00 |
18:12:18.18 |
-27:59:07.0 |
HIP 89238 |
15.66 |