メタデータ
| 項目 |
値 |
| Designation |
52P/Harrington-Abell |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-03-07T08:33:30.715200Z |
| Orbit solution date (soln_date, UTC) |
2023-12-07T09:27:11Z |
| Obs used |
1164 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
16.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-07-09.0000000 |
| e |
0.54004886 |
| q (au) |
1.775054 |
| a (au) |
3.859222 |
| i (deg) |
10.231762 |
| Ω (om, deg) |
336.835681 |
| ω (w, deg) |
139.660705 |
| M (ma, deg) |
111.106469 |
等級
散乱 + 全体線形
$$
M_a = (11.377 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.377 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.989 |
| 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 |
| 2020-09-13 |
2022-02-27 |
+11.7519 |
-3.355 |
| 2022-02-27 |
2022-05-26 |
-2.1491 |
+1.106 |
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) |
| 2026-09-20 00:00 |
20:52:01.03 |
-21:45:10.0 |
HIP 102948 |
12.71 |
| 2026-09-20 12:00 |
20:51:50.56 |
-21:45:13.6 |
HIP 102948 |
11.35 |
| 2026-09-21 00:00 |
20:51:40.27 |
-21:45:16.3 |
HIP 102948 |
10.42 |
| 2026-09-21 12:00 |
20:51:30.16 |
-21:45:18.3 |
HIP 102948 |
9.99 |
| 2026-09-22 00:00 |
20:51:20.24 |
-21:45:19.4 |
HIP 102948 |
10.12 |
| 2026-09-22 12:00 |
20:51:10.49 |
-21:45:19.7 |
HIP 102948 |
10.74 |
| 2026-09-23 00:00 |
20:51:00.93 |
-21:45:19.2 |
HIP 102948 |
11.76 |
| 2026-09-23 12:00 |
20:50:51.55 |
-21:45:17.8 |
HIP 102948 |
13.07 |
| 2026-09-24 00:00 |
20:50:42.36 |
-21:45:15.7 |
HIP 102948 |
14.56 |
| 2026-09-24 12:00 |
20:50:33.35 |
-21:45:12.8 |
HIP 102948 |
16.17 |
| 2026-09-25 00:00 |
20:50:24.53 |
-21:45:09.0 |
HIP 102948 |
17.85 |
| 2026-09-25 12:00 |
20:50:15.89 |
-21:45:04.5 |
HIP 102743 |
17.57 |
| 2026-09-26 00:00 |
20:50:07.44 |
-21:44:59.1 |
HIP 102743 |
15.76 |
| 2026-09-26 12:00 |
20:49:59.18 |
-21:44:53.0 |
HIP 102743 |
14.01 |
| 2026-09-27 00:00 |
20:49:51.11 |
-21:44:46.1 |
HIP 102743 |
12.35 |
| 2026-09-27 12:00 |
20:49:43.23 |
-21:44:38.3 |
HIP 102743 |
10.79 |
| 2026-09-28 00:00 |
20:49:35.54 |
-21:44:29.8 |
HIP 102743 |
9.34 |
| 2026-09-28 12:00 |
20:49:28.04 |
-21:44:20.5 |
HIP 102743 |
8.06 |
| 2026-09-29 00:00 |
20:49:20.73 |
-21:44:10.4 |
HIP 102743 |
6.99 |
| 2026-09-29 12:00 |
20:49:13.61 |
-21:43:59.5 |
HIP 102743 |
6.21 |
| 2026-09-30 00:00 |
20:49:06.68 |
-21:43:47.8 |
HIP 102743 |
5.81 |
| 2026-09-30 12:00 |
20:48:59.95 |
-21:43:35.3 |
HIP 102743 |
5.81 |
| 2026-10-01 00:00 |
20:48:53.41 |
-21:43:22.1 |
HIP 102743 |
6.19 |
| 2026-10-01 12:00 |
20:48:47.07 |
-21:43:08.1 |
HIP 102743 |
6.87 |
| 2026-10-02 00:00 |
20:48:40.92 |
-21:42:53.3 |
HIP 102743 |
7.73 |
| 2026-10-02 12:00 |
20:48:34.96 |
-21:42:37.7 |
HIP 102743 |
8.70 |
| 2026-10-03 00:00 |
20:48:29.20 |
-21:42:21.3 |
HIP 102743 |
9.74 |
| 2026-10-03 12:00 |
20:48:23.64 |
-21:42:04.2 |
HIP 102743 |
10.79 |
| 2026-10-04 00:00 |
20:48:18.27 |
-21:41:46.3 |
HIP 102743 |
11.86 |
| 2026-10-04 12:00 |
20:48:13.10 |
-21:41:27.6 |
HIP 102743 |
12.92 |
| 2026-10-05 00:00 |
20:48:08.13 |
-21:41:08.2 |
HIP 102743 |
13.96 |
| 2026-10-05 12:00 |
20:48:03.36 |
-21:40:48.0 |
HIP 102743 |
14.97 |
| 2026-10-06 00:00 |
20:47:58.78 |
-21:40:27.0 |
HIP 102743 |
15.96 |
| 2026-10-06 12:00 |
20:47:54.40 |
-21:40:05.3 |
HIP 102743 |
16.92 |
| 2026-10-07 00:00 |
20:47:50.22 |
-21:39:42.8 |
HIP 102743 |
17.84 |
| 2026-10-07 12:00 |
20:47:46.24 |
-21:39:19.5 |
HIP 102743 |
18.73 |
| 2026-10-08 00:00 |
20:47:42.47 |
-21:38:55.5 |
HIP 102743 |
19.59 |
| 2026-10-08 12:00 |
20:47:38.89 |
-21:38:30.7 |
HIP 102743 |
20.40 |
| 2026-10-09 00:00 |
20:47:35.51 |
-21:38:05.2 |
HIP 102486 |
21.02 |
| 2026-10-09 12:00 |
20:47:32.33 |
-21:37:38.9 |
HIP 102487 |
20.32 |
| 2026-10-10 00:00 |
20:47:29.35 |
-21:37:11.9 |
HIP 102487 |
19.52 |
| 2026-10-10 12:00 |
20:47:26.57 |
-21:36:44.1 |
HIP 102487 |
18.76 |
| 2026-10-11 00:00 |
20:47:23.99 |
-21:36:15.6 |
HIP 102487 |
18.04 |