メタデータ
| 項目 |
値 |
| Designation |
C/2001 HT50 (LINEAR-NEAT) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-07-09T00:34:23.802240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:09Z |
| Obs used |
3866 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
7.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2003-11-01.0000000 |
| e |
0.99766027 |
| q (au) |
2.792083 |
| a (au) |
1193.337554 |
| i (deg) |
163.212126 |
| Ω (om, deg) |
42.912495 |
| ω (w, deg) |
324.071020 |
| M (ma, deg) |
0.002749 |
等級
散乱 + 全体線形
$$
M_a = (7.009 + 3.500\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.009 |
| n |
3.500 |
| gf |
1.000 |
| gb |
-0.552 |
| k |
0.800 |
| 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) |
| 2026-06-01 00:00 |
19:10:38.18 |
-06:48:38.4 |
HIP 94236 |
12.38 |
| 2026-06-01 12:00 |
19:10:35.76 |
-06:48:36.3 |
HIP 94236 |
12.60 |
| 2026-06-02 00:00 |
19:10:33.33 |
-06:48:34.2 |
HIP 94236 |
12.85 |
| 2026-06-02 12:00 |
19:10:30.89 |
-06:48:32.3 |
HIP 94236 |
13.12 |
| 2026-06-03 00:00 |
19:10:28.44 |
-06:48:30.5 |
HIP 94236 |
13.42 |
| 2026-06-03 12:00 |
19:10:25.97 |
-06:48:28.7 |
HIP 94236 |
13.75 |
| 2026-06-04 00:00 |
19:10:23.48 |
-06:48:27.1 |
HIP 94236 |
14.09 |
| 2026-06-04 12:00 |
19:10:20.99 |
-06:48:25.5 |
HIP 94236 |
14.46 |
| 2026-06-05 00:00 |
19:10:18.48 |
-06:48:24.1 |
HIP 94236 |
14.85 |
| 2026-06-05 12:00 |
19:10:15.96 |
-06:48:22.7 |
HIP 94236 |
15.26 |
| 2026-06-06 00:00 |
19:10:13.42 |
-06:48:21.5 |
HIP 94236 |
15.68 |
| 2026-06-06 12:00 |
19:10:10.87 |
-06:48:20.4 |
HIP 94236 |
16.13 |
| 2026-06-07 00:00 |
19:10:08.31 |
-06:48:19.3 |
HIP 94236 |
16.58 |
| 2026-06-07 12:00 |
19:10:05.74 |
-06:48:18.4 |
HIP 94236 |
17.06 |
| 2026-06-08 00:00 |
19:10:03.16 |
-06:48:17.6 |
HIP 94236 |
17.54 |
| 2026-06-08 12:00 |
19:10:00.56 |
-06:48:16.9 |
HIP 94236 |
18.04 |
| 2026-06-09 00:00 |
19:09:57.95 |
-06:48:16.2 |
HIP 94236 |
18.56 |
| 2026-06-09 12:00 |
19:09:55.33 |
-06:48:15.7 |
HIP 94072 |
18.39 |
| 2026-06-10 00:00 |
19:09:52.70 |
-06:48:15.3 |
HIP 94072 |
17.93 |
| 2026-06-10 12:00 |
19:09:50.05 |
-06:48:15.0 |
HIP 94072 |
17.48 |
| 2026-06-11 00:00 |
19:09:47.40 |
-06:48:14.8 |
HIP 94072 |
17.04 |
| 2026-06-11 12:00 |
19:09:44.73 |
-06:48:14.7 |
HIP 94072 |
16.61 |
| 2026-06-12 00:00 |
19:09:42.06 |
-06:48:14.7 |
HIP 94072 |
16.19 |
| 2026-06-12 12:00 |
19:09:39.37 |
-06:48:14.8 |
HIP 94072 |
15.79 |
| 2026-06-13 00:00 |
19:09:36.68 |
-06:48:15.0 |
HIP 94072 |
15.41 |
| 2026-06-13 12:00 |
19:09:33.97 |
-06:48:15.3 |
HIP 94072 |
15.04 |
| 2026-06-14 00:00 |
19:09:31.25 |
-06:48:15.7 |
HIP 94072 |
14.69 |
| 2026-06-14 12:00 |
19:09:28.52 |
-06:48:16.2 |
HIP 94072 |
14.36 |
| 2026-06-15 00:00 |
19:09:25.79 |
-06:48:16.9 |
HIP 94072 |
14.05 |
| 2026-06-15 12:00 |
19:09:23.04 |
-06:48:17.6 |
HIP 94072 |
13.77 |
| 2026-06-16 00:00 |
19:09:20.29 |
-06:48:18.4 |
HIP 94072 |
13.51 |
| 2026-06-16 12:00 |
19:09:17.52 |
-06:48:19.4 |
HIP 94072 |
13.28 |
| 2026-06-17 00:00 |
19:09:14.75 |
-06:48:20.4 |
HIP 94072 |
13.08 |
| 2026-06-17 12:00 |
19:09:11.97 |
-06:48:21.5 |
HIP 94072 |
12.91 |
| 2026-06-18 00:00 |
19:09:09.18 |
-06:48:22.8 |
HIP 94072 |
12.78 |
| 2026-06-18 12:00 |
19:09:06.39 |
-06:48:24.1 |
HIP 94072 |
12.68 |
| 2026-06-19 00:00 |
19:09:03.58 |
-06:48:25.6 |
HIP 94072 |
12.62 |
| 2026-06-19 12:00 |
19:09:00.77 |
-06:48:27.1 |
HIP 94072 |
12.59 |
| 2026-06-20 00:00 |
19:08:57.95 |
-06:48:28.8 |
HIP 94072 |
12.60 |
| 2026-06-20 12:00 |
19:08:55.12 |
-06:48:30.6 |
HIP 94072 |
12.64 |
| 2026-06-21 00:00 |
19:08:52.29 |
-06:48:32.4 |
HIP 94072 |
12.73 |
| 2026-06-21 12:00 |
19:08:49.45 |
-06:48:34.4 |
HIP 94072 |
12.85 |
| 2026-06-22 00:00 |
19:08:46.60 |
-06:48:36.5 |
HIP 94072 |
13.01 |