271P/van Houten-Lemmon
メタデータ
| 項目 |
値 |
| Designation |
271P/van Houten-Lemmon |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-07-05T13:04:46.807680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:12Z |
| Obs used |
96 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
15.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-09-26.0000000 |
| e |
0.39067132 |
| q (au) |
4.249690 |
| a (au) |
6.974381 |
| i (deg) |
6.856107 |
| Ω (om, deg) |
9.590375 |
| ω (w, deg) |
35.088457 |
| M (ma, deg) |
344.880647 |
等級
散乱 + 全体線形
$$
M_a = (6.743 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.743 |
| n |
6.000 |
| gf |
0.996 |
| gb |
-0.982 |
| k |
1.000 |
| δ90 |
9.986 |
| 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) |
| 2026-02-03 00:00 |
17:21:42.61 |
-29:07:20.8 |
HIP 85003 |
9.73 |
| 2026-02-03 12:00 |
17:21:55.30 |
-29:07:49.1 |
HIP 85003 |
6.93 |
| 2026-02-04 00:00 |
17:22:07.90 |
-29:08:17.4 |
HIP 85003 |
4.13 |
| 2026-02-04 12:00 |
17:22:20.43 |
-29:08:45.6 |
HIP 85003 |
1.36 |
| 2026-02-05 00:00 |
17:22:32.88 |
-29:09:13.8 |
HIP 85003 |
1.41 |
| 2026-02-05 12:00 |
17:22:45.24 |
-29:09:42.0 |
HIP 85003 |
4.15 |
| 2026-02-06 00:00 |
17:22:57.53 |
-29:10:10.2 |
HIP 85003 |
6.87 |
| 2026-02-06 12:00 |
17:23:09.74 |
-29:10:38.4 |
HIP 85003 |
9.57 |
| 2026-02-07 00:00 |
17:23:21.86 |
-29:11:06.6 |
HIP 85003 |
12.26 |
| 2026-02-07 12:00 |
17:23:33.90 |
-29:11:34.8 |
HIP 85148 |
10.83 |
| 2026-02-08 00:00 |
17:23:45.86 |
-29:12:02.9 |
HIP 85148 |
9.15 |
| 2026-02-08 12:00 |
17:23:57.73 |
-29:12:31.0 |
HIP 85148 |
8.01 |
| 2026-02-09 00:00 |
17:24:09.52 |
-29:12:59.2 |
HIP 85148 |
7.65 |
| 2026-02-09 12:00 |
17:24:21.22 |
-29:13:27.3 |
HIP 85148 |
8.14 |
| 2026-02-10 00:00 |
17:24:32.84 |
-29:13:55.4 |
HIP 85148 |
9.34 |
| 2026-02-10 12:00 |
17:24:44.37 |
-29:14:23.5 |
HIP 85148 |
11.01 |
| 2026-02-11 00:00 |
17:24:55.81 |
-29:14:51.5 |
HIP 85148 |
12.95 |
| 2026-02-11 12:00 |
17:25:07.16 |
-29:15:19.6 |
HIP 85148 |
15.05 |
| 2026-02-12 00:00 |
17:25:18.42 |
-29:15:47.7 |
HIP 85148 |
17.24 |
| 2026-02-12 12:00 |
17:25:29.60 |
-29:16:15.7 |
HIP 85148 |
19.49 |
| 2026-02-13 00:00 |
17:25:40.68 |
-29:16:43.7 |
HIP 85396 |
17.84 |
| 2026-02-13 12:00 |
17:25:51.67 |
-29:17:11.8 |
HIP 85396 |
15.57 |
| 2026-02-14 00:00 |
17:26:02.57 |
-29:17:39.8 |
HIP 85396 |
13.38 |
| 2026-02-14 12:00 |
17:26:13.38 |
-29:18:07.8 |
HIP 85396 |
11.30 |
| 2026-02-15 00:00 |
17:26:24.09 |
-29:18:35.7 |
HIP 85396 |
9.39 |
| 2026-02-15 12:00 |
17:26:34.71 |
-29:19:03.7 |
HIP 85396 |
7.77 |
| 2026-02-16 00:00 |
17:26:45.23 |
-29:19:31.7 |
HIP 85396 |
6.62 |
| 2026-02-16 12:00 |
17:26:55.66 |
-29:19:59.6 |
HIP 85396 |
6.19 |
| 2026-02-17 00:00 |
17:27:06.00 |
-29:20:27.5 |
HIP 85396 |
6.60 |
| 2026-02-17 12:00 |
17:27:16.23 |
-29:20:55.5 |
HIP 85396 |
7.70 |
| 2026-02-18 00:00 |
17:27:26.37 |
-29:21:23.4 |
HIP 85396 |
9.23 |
| 2026-02-18 12:00 |
17:27:36.41 |
-29:21:51.3 |
HIP 85396 |
10.99 |
| 2026-02-19 00:00 |
17:27:46.35 |
-29:22:19.2 |
HIP 85396 |
12.89 |
| 2026-02-19 12:00 |
17:27:56.19 |
-29:22:47.0 |
HIP 85396 |
14.86 |
| 2026-02-20 00:00 |
17:28:05.93 |
-29:23:14.9 |
HIP 85396 |
16.86 |
| 2026-02-20 12:00 |
17:28:15.57 |
-29:23:42.8 |
HIP 85396 |
18.89 |
| 2026-02-21 00:00 |
17:28:25.11 |
-29:24:10.6 |
HIP 85507 |
20.67 |
| 2026-02-21 12:00 |
17:28:34.55 |
-29:24:38.4 |
HIP 85507 |
21.18 |
| 2026-02-22 00:00 |
17:28:43.88 |
-29:25:06.2 |
HIP 85507 |
21.88 |
| 2026-02-22 12:00 |
17:28:53.11 |
-29:25:34.0 |
HIP 85507 |
22.74 |
| 2026-02-23 00:00 |
17:29:02.24 |
-29:26:01.8 |
HIP 85507 |
23.75 |
| 2026-02-23 12:00 |
17:29:11.26 |
-29:26:29.6 |
HIP 85507 |
24.88 |
| 2026-02-24 00:00 |
17:29:20.18 |
-29:26:57.3 |
HIP 85507 |
26.10 |