メタデータ
| 項目 |
値 |
| Designation |
251P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2004-06-19T01:47:38.279040Z |
| Orbit solution date (soln_date, UTC) |
2024-10-05T23:12:40Z |
| Obs used |
431 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
24.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2007-04-11.0000000 |
| e |
0.50982311 |
| q (au) |
1.711672 |
| a (au) |
3.491948 |
| i (deg) |
23.507154 |
| Ω (om, deg) |
219.552911 |
| ω (w, deg) |
30.906733 |
| M (ma, deg) |
154.959455 |
等級
散乱 + 全体線形
$$
M_a = (15.255 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.255 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.719 |
| k |
0.978 |
| 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) |
| 2026-03-26 00:00 |
02:22:29.36 |
+12:24:40.2 |
HIP 11082 |
9.34 |
| 2026-03-26 12:00 |
02:22:54.02 |
+12:26:03.4 |
HIP 11082 |
8.14 |
| 2026-03-27 00:00 |
02:23:18.73 |
+12:27:26.8 |
HIP 11082 |
11.04 |
| 2026-03-27 12:00 |
02:23:43.49 |
+12:28:50.3 |
HIP 11082 |
15.95 |
| 2026-03-28 00:00 |
02:24:08.30 |
+12:30:13.8 |
HIP 11082 |
21.54 |
| 2026-03-28 12:00 |
02:24:33.16 |
+12:31:37.4 |
HIP 11280 |
21.94 |
| 2026-03-29 00:00 |
02:24:58.06 |
+12:33:01.1 |
HIP 11280 |
18.38 |
| 2026-03-29 12:00 |
02:25:23.00 |
+12:34:24.8 |
HIP 11280 |
16.49 |
| 2026-03-30 00:00 |
02:25:47.99 |
+12:35:48.6 |
HIP 11280 |
16.86 |
| 2026-03-30 12:00 |
02:26:13.03 |
+12:37:12.4 |
HIP 11369 |
17.06 |
| 2026-03-31 00:00 |
02:26:38.10 |
+12:38:36.3 |
HIP 11369 |
15.57 |
| 2026-03-31 12:00 |
02:27:03.23 |
+12:40:00.2 |
HIP 11369 |
16.50 |
| 2026-04-01 00:00 |
02:27:28.39 |
+12:41:24.2 |
HIP 11518 |
16.21 |
| 2026-04-01 12:00 |
02:27:53.59 |
+12:42:48.2 |
HIP 11518 |
9.90 |
| 2026-04-02 00:00 |
02:28:18.84 |
+12:44:12.2 |
HIP 11518 |
3.59 |
| 2026-04-02 12:00 |
02:28:44.13 |
+12:45:36.2 |
HIP 11518 |
2.74 |
| 2026-04-03 00:00 |
02:29:09.45 |
+12:47:00.2 |
HIP 11518 |
9.07 |
| 2026-04-03 12:00 |
02:29:34.82 |
+12:48:24.2 |
HIP 11518 |
15.41 |
| 2026-04-04 00:00 |
02:30:00.22 |
+12:49:48.3 |
HIP 11518 |
21.76 |
| 2026-04-04 12:00 |
02:30:25.66 |
+12:51:12.3 |
HIP 11795 |
27.74 |
| 2026-04-05 00:00 |
02:30:51.14 |
+12:52:36.3 |
HIP 11795 |
22.73 |
| 2026-04-05 12:00 |
02:31:16.66 |
+12:54:00.3 |
HIP 11795 |
18.55 |
| 2026-04-06 00:00 |
02:31:42.21 |
+12:55:24.3 |
HIP 11795 |
15.91 |
| 2026-04-06 12:00 |
02:32:07.80 |
+12:56:48.3 |
HIP 11795 |
15.61 |
| 2026-04-07 00:00 |
02:32:33.42 |
+12:58:12.2 |
HIP 11795 |
17.78 |
| 2026-04-07 12:00 |
02:32:59.08 |
+12:59:36.1 |
HIP 11795 |
21.69 |
| 2026-04-08 00:00 |
02:33:24.78 |
+13:01:00.0 |
HIP 11795 |
26.60 |
| 2026-04-08 12:00 |
02:33:50.50 |
+13:02:23.7 |
HIP 12049 |
22.85 |
| 2026-04-09 00:00 |
02:34:16.26 |
+13:03:47.5 |
HIP 12049 |
16.44 |
| 2026-04-09 12:00 |
02:34:42.05 |
+13:05:11.2 |
HIP 12049 |
10.04 |
| 2026-04-10 00:00 |
02:35:07.87 |
+13:06:34.8 |
HIP 12049 |
3.73 |
| 2026-04-10 12:00 |
02:35:33.73 |
+13:07:58.4 |
HIP 12049 |
3.19 |
| 2026-04-11 00:00 |
02:35:59.61 |
+13:09:21.9 |
HIP 12049 |
9.47 |
| 2026-04-11 12:00 |
02:36:25.53 |
+13:10:45.3 |
HIP 12049 |
15.89 |
| 2026-04-12 00:00 |
02:36:51.47 |
+13:12:08.6 |
HIP 12198 |
18.35 |
| 2026-04-12 12:00 |
02:37:17.44 |
+13:13:31.9 |
HIP 12198 |
19.62 |
| 2026-04-13 00:00 |
02:37:43.44 |
+13:14:55.0 |
HIP 12198 |
22.74 |
| 2026-04-13 12:00 |
02:38:09.47 |
+13:16:18.1 |
HIP 12198 |
27.08 |
| 2026-04-14 00:00 |
02:38:35.52 |
+13:17:41.0 |
HIP 12461 |
30.50 |
| 2026-04-14 12:00 |
02:39:01.60 |
+13:19:03.9 |
HIP 12461 |
24.29 |
| 2026-04-15 00:00 |
02:39:27.71 |
+13:20:26.6 |
HIP 12461 |
18.26 |
| 2026-04-15 12:00 |
02:39:53.84 |
+13:21:49.2 |
HIP 12461 |
12.71 |
| 2026-04-16 00:00 |
02:40:19.99 |
+13:23:11.7 |
HIP 12461 |
8.61 |