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) |
| 2026-05-12 00:00 |
11:11:24.94 |
+11:38:20.5 |
HIP 54607 |
12.63 |
| 2026-05-12 12:00 |
11:11:21.54 |
+11:38:09.1 |
HIP 54607 |
11.79 |
| 2026-05-13 00:00 |
11:11:18.31 |
+11:37:56.6 |
HIP 54607 |
10.99 |
| 2026-05-13 12:00 |
11:11:15.25 |
+11:37:43.0 |
HIP 54607 |
10.24 |
| 2026-05-14 00:00 |
11:11:12.37 |
+11:37:28.3 |
HIP 54607 |
9.53 |
| 2026-05-14 12:00 |
11:11:09.65 |
+11:37:12.5 |
HIP 54607 |
8.88 |
| 2026-05-15 00:00 |
11:11:07.10 |
+11:36:55.7 |
HIP 54607 |
8.27 |
| 2026-05-15 12:00 |
11:11:04.73 |
+11:36:37.7 |
HIP 54607 |
7.73 |
| 2026-05-16 00:00 |
11:11:02.52 |
+11:36:18.7 |
HIP 54607 |
7.24 |
| 2026-05-16 12:00 |
11:11:00.49 |
+11:35:58.6 |
HIP 54607 |
6.83 |
| 2026-05-17 00:00 |
11:10:58.62 |
+11:35:37.4 |
HIP 54607 |
6.48 |
| 2026-05-17 12:00 |
11:10:56.93 |
+11:35:15.2 |
HIP 54607 |
6.22 |
| 2026-05-18 00:00 |
11:10:55.41 |
+11:34:51.9 |
HIP 54607 |
6.05 |
| 2026-05-18 12:00 |
11:10:54.05 |
+11:34:27.5 |
HIP 54607 |
5.96 |
| 2026-05-19 00:00 |
11:10:52.87 |
+11:34:02.1 |
HIP 54607 |
5.96 |
| 2026-05-19 12:00 |
11:10:51.85 |
+11:33:35.6 |
HIP 54607 |
6.05 |
| 2026-05-20 00:00 |
11:10:51.00 |
+11:33:08.1 |
HIP 54607 |
6.22 |
| 2026-05-20 12:00 |
11:10:50.33 |
+11:32:39.6 |
HIP 54607 |
6.46 |
| 2026-05-21 00:00 |
11:10:49.82 |
+11:32:10.0 |
HIP 54607 |
6.77 |
| 2026-05-21 12:00 |
11:10:49.47 |
+11:31:39.4 |
HIP 54607 |
7.14 |
| 2026-05-22 00:00 |
11:10:49.30 |
+11:31:07.7 |
HIP 54607 |
7.57 |
| 2026-05-22 12:00 |
11:10:49.29 |
+11:30:35.1 |
HIP 54607 |
8.04 |
| 2026-05-23 00:00 |
11:10:49.45 |
+11:30:01.4 |
HIP 54607 |
8.55 |
| 2026-05-23 12:00 |
11:10:49.77 |
+11:29:26.8 |
HIP 54607 |
9.10 |
| 2026-05-24 00:00 |
11:10:50.26 |
+11:28:51.1 |
HIP 54607 |
9.69 |
| 2026-05-24 12:00 |
11:10:50.91 |
+11:28:14.4 |
HIP 54607 |
10.31 |
| 2026-05-25 00:00 |
11:10:51.73 |
+11:27:36.8 |
HIP 54613 |
10.19 |
| 2026-05-25 12:00 |
11:10:52.71 |
+11:26:58.2 |
HIP 54613 |
9.69 |
| 2026-05-26 00:00 |
11:10:53.86 |
+11:26:18.6 |
HIP 54613 |
9.22 |
| 2026-05-26 12:00 |
11:10:55.16 |
+11:25:38.0 |
HIP 54613 |
8.78 |
| 2026-05-27 00:00 |
11:10:56.63 |
+11:24:56.5 |
HIP 54613 |
8.40 |
| 2026-05-27 12:00 |
11:10:58.26 |
+11:24:14.0 |
HIP 54613 |
8.08 |
| 2026-05-28 00:00 |
11:11:00.06 |
+11:23:30.5 |
HIP 54613 |
7.86 |
| 2026-05-28 12:00 |
11:11:02.01 |
+11:22:46.1 |
HIP 54613 |
7.75 |
| 2026-05-29 00:00 |
11:11:04.12 |
+11:22:00.8 |
HIP 54613 |
7.76 |
| 2026-05-29 12:00 |
11:11:06.39 |
+11:21:14.5 |
HIP 54613 |
7.91 |
| 2026-05-30 00:00 |
11:11:08.82 |
+11:20:27.3 |
HIP 54613 |
8.20 |
| 2026-05-30 12:00 |
11:11:11.41 |
+11:19:39.2 |
HIP 54613 |
8.63 |
| 2026-05-31 00:00 |
11:11:14.16 |
+11:18:50.1 |
HIP 54622 |
8.71 |
| 2026-05-31 12:00 |
11:11:17.06 |
+11:18:00.1 |
HIP 54622 |
8.78 |
| 2026-06-01 00:00 |
11:11:20.12 |
+11:17:09.3 |
HIP 54622 |
9.00 |
| 2026-06-01 12:00 |
11:11:23.34 |
+11:16:17.5 |
HIP 54622 |
9.39 |
| 2026-06-02 00:00 |
11:11:26.71 |
+11:15:24.8 |
HIP 54622 |
9.93 |