メタデータ
| 項目 |
値 |
| Designation |
51P/Harrington |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-08-12T09:52:15.983040Z |
| Orbit solution date (soln_date, UTC) |
2022-10-24T10:18:34Z |
| Obs used |
99 |
| NEO |
- |
| M1 |
18.600 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-06-21.0000000 |
| e |
0.54204517 |
| q (au) |
1.699112 |
| a (au) |
3.710217 |
| i (deg) |
5.423652 |
| Ω (om, deg) |
83.717710 |
| ω (w, deg) |
269.163564 |
| M (ma, deg) |
93.586186 |
等級
散乱 + 全体線形
$$
M_a = (19.171 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
19.171 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.607 |
| k |
0.920 |
| 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 |
11:28:09.71 |
+10:31:58.9 |
HIP 55962 |
8.40 |
| 2026-03-26 12:00 |
11:27:53.56 |
+10:33:30.1 |
HIP 55962 |
7.34 |
| 2026-03-27 00:00 |
11:27:37.48 |
+10:35:00.5 |
HIP 55962 |
8.56 |
| 2026-03-27 12:00 |
11:27:21.47 |
+10:36:30.0 |
HIP 55962 |
11.32 |
| 2026-03-28 00:00 |
11:27:05.52 |
+10:37:58.6 |
HIP 55962 |
14.76 |
| 2026-03-28 12:00 |
11:26:49.64 |
+10:39:26.4 |
HIP 55820 |
15.29 |
| 2026-03-29 00:00 |
11:26:33.84 |
+10:40:53.3 |
HIP 55820 |
15.66 |
| 2026-03-29 12:00 |
11:26:18.11 |
+10:42:19.3 |
HIP 55820 |
17.04 |
| 2026-03-30 00:00 |
11:26:02.45 |
+10:43:44.4 |
HIP 55820 |
19.20 |
| 2026-03-30 12:00 |
11:25:46.88 |
+10:45:08.5 |
HIP 55820 |
21.90 |
| 2026-03-31 00:00 |
11:25:31.39 |
+10:46:31.8 |
HIP 55820 |
24.95 |
| 2026-03-31 12:00 |
11:25:15.97 |
+10:47:54.1 |
HIP 55642 |
25.53 |
| 2026-04-01 00:00 |
11:25:00.65 |
+10:49:15.5 |
HIP 55642 |
23.72 |
| 2026-04-01 12:00 |
11:24:45.41 |
+10:50:35.9 |
HIP 55642 |
22.48 |
| 2026-04-02 00:00 |
11:24:30.26 |
+10:51:55.4 |
HIP 55642 |
21.89 |
| 2026-04-02 12:00 |
11:24:15.20 |
+10:53:13.9 |
HIP 55642 |
22.00 |
| 2026-04-03 00:00 |
11:24:00.23 |
+10:54:31.5 |
HIP 55642 |
22.77 |
| 2026-04-03 12:00 |
11:23:45.36 |
+10:55:48.0 |
HIP 55642 |
24.14 |
| 2026-04-04 00:00 |
11:23:30.58 |
+10:57:03.6 |
HIP 55642 |
26.00 |
| 2026-04-04 12:00 |
11:23:15.91 |
+10:58:18.1 |
HIP 55642 |
28.24 |
| 2026-04-05 00:00 |
11:23:01.33 |
+10:59:31.7 |
HIP 55461 |
29.99 |
| 2026-04-05 12:00 |
11:22:46.86 |
+11:00:44.2 |
HIP 55461 |
26.56 |
| 2026-04-06 00:00 |
11:22:32.49 |
+11:01:55.7 |
HIP 55461 |
23.26 |
| 2026-04-06 12:00 |
11:22:18.23 |
+11:03:06.2 |
HIP 55461 |
20.14 |
| 2026-04-07 00:00 |
11:22:04.07 |
+11:04:15.7 |
HIP 55461 |
17.27 |
| 2026-04-07 12:00 |
11:21:50.03 |
+11:05:24.1 |
HIP 55461 |
14.78 |
| 2026-04-08 00:00 |
11:21:36.10 |
+11:06:31.4 |
HIP 55421 |
11.48 |
| 2026-04-08 12:00 |
11:21:22.28 |
+11:07:37.7 |
HIP 55421 |
8.14 |
| 2026-04-09 00:00 |
11:21:08.58 |
+11:08:42.9 |
HIP 55421 |
5.15 |
| 2026-04-09 12:00 |
11:20:54.99 |
+11:09:47.1 |
HIP 55421 |
3.44 |
| 2026-04-10 00:00 |
11:20:41.52 |
+11:10:50.1 |
HIP 55421 |
4.63 |
| 2026-04-10 12:00 |
11:20:28.18 |
+11:11:52.1 |
HIP 55421 |
7.40 |
| 2026-04-11 00:00 |
11:20:14.95 |
+11:12:53.0 |
HIP 55421 |
10.53 |
| 2026-04-11 12:00 |
11:20:01.85 |
+11:13:52.8 |
HIP 55421 |
13.76 |
| 2026-04-12 00:00 |
11:19:48.88 |
+11:14:51.5 |
HIP 55421 |
17.01 |
| 2026-04-12 12:00 |
11:19:36.03 |
+11:15:49.1 |
HIP 55421 |
20.25 |
| 2026-04-13 00:00 |
11:19:23.31 |
+11:16:45.6 |
HIP 55421 |
23.47 |
| 2026-04-13 12:00 |
11:19:10.72 |
+11:17:40.9 |
HIP 55421 |
26.66 |
| 2026-04-14 00:00 |
11:18:58.27 |
+11:18:35.1 |
HIP 55421 |
29.83 |
| 2026-04-14 12:00 |
11:18:45.94 |
+11:19:28.2 |
HIP 55421 |
32.96 |
| 2026-04-15 00:00 |
11:18:33.76 |
+11:20:20.2 |
HIP 55421 |
36.06 |
| 2026-04-15 12:00 |
11:18:21.71 |
+11:21:11.0 |
HIP 55092 |
37.40 |
| 2026-04-16 00:00 |
11:18:09.79 |
+11:22:00.7 |
HIP 55092 |
34.99 |