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) |
| 2026-05-12 00:00 |
21:38:20.15 |
-19:00:54.3 |
HIP 106768 |
16.39 |
| 2026-05-12 12:00 |
21:38:26.56 |
-19:00:33.1 |
HIP 106768 |
17.62 |
| 2026-05-13 00:00 |
21:38:32.81 |
-19:00:12.7 |
HIP 106868 |
18.82 |
| 2026-05-13 12:00 |
21:38:38.91 |
-18:59:53.0 |
HIP 106868 |
18.40 |
| 2026-05-14 00:00 |
21:38:44.85 |
-18:59:34.2 |
HIP 106868 |
18.11 |
| 2026-05-14 12:00 |
21:38:50.63 |
-18:59:16.1 |
HIP 106868 |
17.94 |
| 2026-05-15 00:00 |
21:38:56.24 |
-18:58:58.9 |
HIP 106868 |
17.88 |
| 2026-05-15 12:00 |
21:39:01.70 |
-18:58:42.4 |
HIP 106868 |
17.92 |
| 2026-05-16 00:00 |
21:39:07.00 |
-18:58:26.7 |
HIP 106868 |
18.06 |
| 2026-05-16 12:00 |
21:39:12.13 |
-18:58:11.9 |
HIP 106868 |
18.29 |
| 2026-05-17 00:00 |
21:39:17.11 |
-18:57:57.8 |
HIP 106868 |
18.59 |
| 2026-05-17 12:00 |
21:39:21.91 |
-18:57:44.5 |
HIP 107032 |
17.69 |
| 2026-05-18 00:00 |
21:39:26.56 |
-18:57:32.1 |
HIP 107032 |
16.57 |
| 2026-05-18 12:00 |
21:39:31.04 |
-18:57:20.4 |
HIP 107032 |
15.50 |
| 2026-05-19 00:00 |
21:39:35.36 |
-18:57:09.6 |
HIP 107032 |
14.46 |
| 2026-05-19 12:00 |
21:39:39.51 |
-18:56:59.5 |
HIP 107032 |
13.47 |
| 2026-05-20 00:00 |
21:39:43.49 |
-18:56:50.3 |
HIP 107032 |
12.52 |
| 2026-05-20 12:00 |
21:39:47.31 |
-18:56:41.9 |
HIP 107032 |
11.61 |
| 2026-05-21 00:00 |
21:39:50.96 |
-18:56:34.3 |
HIP 107032 |
10.74 |
| 2026-05-21 12:00 |
21:39:54.44 |
-18:56:27.5 |
HIP 107032 |
9.92 |
| 2026-05-22 00:00 |
21:39:57.76 |
-18:56:21.5 |
HIP 107032 |
9.14 |
| 2026-05-22 12:00 |
21:40:00.90 |
-18:56:16.4 |
HIP 107032 |
8.40 |
| 2026-05-23 00:00 |
21:40:03.88 |
-18:56:12.0 |
HIP 107032 |
7.71 |
| 2026-05-23 12:00 |
21:40:06.69 |
-18:56:08.5 |
HIP 107032 |
7.06 |
| 2026-05-24 00:00 |
21:40:09.33 |
-18:56:05.8 |
HIP 107032 |
6.46 |
| 2026-05-24 12:00 |
21:40:11.80 |
-18:56:03.9 |
HIP 107032 |
5.91 |
| 2026-05-25 00:00 |
21:40:14.10 |
-18:56:02.8 |
HIP 107032 |
5.41 |
| 2026-05-25 12:00 |
21:40:16.23 |
-18:56:02.5 |
HIP 107032 |
4.95 |
| 2026-05-26 00:00 |
21:40:18.19 |
-18:56:03.1 |
HIP 107032 |
4.55 |
| 2026-05-26 12:00 |
21:40:19.98 |
-18:56:04.5 |
HIP 107032 |
4.21 |
| 2026-05-27 00:00 |
21:40:21.59 |
-18:56:06.7 |
HIP 107032 |
3.92 |
| 2026-05-27 12:00 |
21:40:23.04 |
-18:56:09.7 |
HIP 107032 |
3.68 |
| 2026-05-28 00:00 |
21:40:24.31 |
-18:56:13.5 |
HIP 107032 |
3.51 |
| 2026-05-28 12:00 |
21:40:25.40 |
-18:56:18.1 |
HIP 107032 |
3.39 |
| 2026-05-29 00:00 |
21:40:26.33 |
-18:56:23.6 |
HIP 107032 |
3.32 |
| 2026-05-29 12:00 |
21:40:27.08 |
-18:56:29.8 |
HIP 107032 |
3.31 |
| 2026-05-30 00:00 |
21:40:27.65 |
-18:56:36.9 |
HIP 107032 |
3.33 |
| 2026-05-30 12:00 |
21:40:28.05 |
-18:56:44.8 |
HIP 107032 |
3.40 |
| 2026-05-31 00:00 |
21:40:28.28 |
-18:56:53.6 |
HIP 107032 |
3.51 |
| 2026-05-31 12:00 |
21:40:28.33 |
-18:57:03.1 |
HIP 107032 |
3.65 |
| 2026-06-01 00:00 |
21:40:28.20 |
-18:57:13.5 |
HIP 107032 |
3.82 |
| 2026-06-01 12:00 |
21:40:27.90 |
-18:57:24.6 |
HIP 107032 |
4.02 |
| 2026-06-02 00:00 |
21:40:27.42 |
-18:57:36.6 |
HIP 107032 |
4.24 |