メタデータ
| 項目 |
値 |
| Designation |
221P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-01-24T08:32:46.219200Z |
| Orbit solution date (soln_date, UTC) |
2022-10-28T22:13:13Z |
| Obs used |
627 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
13.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-08-08.0000000 |
| e |
0.48757555 |
| q (au) |
1.779766 |
| a (au) |
3.473226 |
| i (deg) |
11.431021 |
| Ω (om, deg) |
229.989314 |
| ω (w, deg) |
39.511181 |
| M (ma, deg) |
140.944591 |
等級
散乱 + 全体線形
$$
M_a = (12.562 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.562 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.891 |
| k |
0.999 |
| 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) |
| 2026-09-20 00:00 |
09:04:32.71 |
+07:35:08.5 |
HIP 44406 |
31.82 |
| 2026-09-20 12:00 |
09:04:59.16 |
+07:32:35.1 |
HIP 44406 |
36.40 |
| 2026-09-21 00:00 |
09:05:25.54 |
+07:30:01.3 |
HIP 44780 |
32.72 |
| 2026-09-21 12:00 |
09:05:51.86 |
+07:27:27.4 |
HIP 44780 |
26.24 |
| 2026-09-22 00:00 |
09:06:18.11 |
+07:24:53.1 |
HIP 44780 |
20.13 |
| 2026-09-22 12:00 |
09:06:44.28 |
+07:22:18.6 |
HIP 44780 |
14.84 |
| 2026-09-23 00:00 |
09:07:10.39 |
+07:19:43.8 |
HIP 44780 |
11.54 |
| 2026-09-23 12:00 |
09:07:36.43 |
+07:17:08.7 |
HIP 44780 |
11.96 |
| 2026-09-24 00:00 |
09:08:02.40 |
+07:14:33.4 |
HIP 44869 |
14.42 |
| 2026-09-24 12:00 |
09:08:28.29 |
+07:11:57.8 |
HIP 44869 |
14.76 |
| 2026-09-25 00:00 |
09:08:54.12 |
+07:09:22.0 |
HIP 44869 |
17.98 |
| 2026-09-25 12:00 |
09:09:19.87 |
+07:06:46.0 |
HIP 44869 |
22.90 |
| 2026-09-26 00:00 |
09:09:45.54 |
+07:04:09.7 |
HIP 45010 |
27.56 |
| 2026-09-26 12:00 |
09:10:11.14 |
+07:01:33.1 |
HIP 45010 |
29.88 |
| 2026-09-27 00:00 |
09:10:36.67 |
+06:58:56.3 |
HIP 45194 |
29.54 |
| 2026-09-27 12:00 |
09:11:02.12 |
+06:56:19.3 |
HIP 45194 |
23.13 |
| 2026-09-28 00:00 |
09:11:27.50 |
+06:53:42.1 |
HIP 45194 |
17.06 |
| 2026-09-28 12:00 |
09:11:52.79 |
+06:51:04.6 |
HIP 45194 |
11.86 |
| 2026-09-29 00:00 |
09:12:18.01 |
+06:48:27.0 |
HIP 45194 |
9.11 |
| 2026-09-29 12:00 |
09:12:43.15 |
+06:45:49.1 |
HIP 45194 |
10.84 |
| 2026-09-30 00:00 |
09:13:08.21 |
+06:43:11.0 |
HIP 45194 |
15.61 |
| 2026-09-30 12:00 |
09:13:33.19 |
+06:40:32.7 |
HIP 45194 |
21.46 |
| 2026-10-01 00:00 |
09:13:58.09 |
+06:37:54.2 |
HIP 45194 |
27.70 |
| 2026-10-01 12:00 |
09:14:22.91 |
+06:35:15.5 |
HIP 45471 |
23.37 |
| 2026-10-02 00:00 |
09:14:47.64 |
+06:32:36.7 |
HIP 45471 |
17.06 |
| 2026-10-02 12:00 |
09:15:12.29 |
+06:29:57.6 |
HIP 45471 |
11.22 |
| 2026-10-03 00:00 |
09:15:36.85 |
+06:27:18.4 |
HIP 45471 |
7.06 |
| 2026-10-03 12:00 |
09:16:01.33 |
+06:24:39.0 |
HIP 45471 |
7.90 |
| 2026-10-04 00:00 |
09:16:25.72 |
+06:21:59.4 |
HIP 45471 |
12.76 |
| 2026-10-04 12:00 |
09:16:50.02 |
+06:19:19.7 |
HIP 45471 |
18.71 |
| 2026-10-05 00:00 |
09:17:14.23 |
+06:16:39.9 |
HIP 45471 |
24.97 |
| 2026-10-05 12:00 |
09:17:38.35 |
+06:13:59.9 |
HIP 45471 |
31.35 |
| 2026-10-06 00:00 |
09:18:02.38 |
+06:11:19.7 |
HIP 45471 |
37.78 |
| 2026-10-06 12:00 |
09:18:26.32 |
+06:08:39.4 |
HIP 45471 |
44.22 |
| 2026-10-07 00:00 |
09:18:50.17 |
+06:05:59.0 |
HIP 45471 |
50.66 |
| 2026-10-07 12:00 |
09:19:13.92 |
+06:03:18.5 |
HIP 45882 |
45.63 |
| 2026-10-08 00:00 |
09:19:37.58 |
+06:00:37.9 |
HIP 45882 |
39.71 |
| 2026-10-08 12:00 |
09:20:01.14 |
+05:57:57.1 |
HIP 45882 |
34.00 |
| 2026-10-09 00:00 |
09:20:24.60 |
+05:55:16.3 |
HIP 45882 |
28.61 |
| 2026-10-09 12:00 |
09:20:47.96 |
+05:52:35.3 |
HIP 45882 |
23.75 |
| 2026-10-10 00:00 |
09:21:11.22 |
+05:49:54.3 |
HIP 45882 |
19.78 |
| 2026-10-10 12:00 |
09:21:34.39 |
+05:47:13.2 |
HIP 45942 |
15.06 |
| 2026-10-11 00:00 |
09:21:57.45 |
+05:44:32.1 |
HIP 45942 |
10.17 |