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) |
| 2026-03-26 00:00 |
17:34:45.49 |
-29:54:02.1 |
HIP 86138 |
22.90 |
| 2026-03-26 12:00 |
17:34:47.14 |
-29:54:28.0 |
HIP 86138 |
22.87 |
| 2026-03-27 00:00 |
17:34:48.66 |
-29:54:53.9 |
HIP 86138 |
22.87 |
| 2026-03-27 12:00 |
17:34:50.06 |
-29:55:19.7 |
HIP 86138 |
22.90 |
| 2026-03-28 00:00 |
17:34:51.32 |
-29:55:45.4 |
HIP 86138 |
22.97 |
| 2026-03-28 12:00 |
17:34:52.45 |
-29:56:11.0 |
HIP 86138 |
23.06 |
| 2026-03-29 00:00 |
17:34:53.46 |
-29:56:36.6 |
HIP 86138 |
23.19 |
| 2026-03-29 12:00 |
17:34:54.33 |
-29:57:02.1 |
HIP 86138 |
23.35 |
| 2026-03-30 00:00 |
17:34:55.08 |
-29:57:27.5 |
HIP 86138 |
23.53 |
| 2026-03-30 12:00 |
17:34:55.69 |
-29:57:52.9 |
HIP 86138 |
23.74 |
| 2026-03-31 00:00 |
17:34:56.18 |
-29:58:18.1 |
HIP 86138 |
23.97 |
| 2026-03-31 12:00 |
17:34:56.53 |
-29:58:43.3 |
HIP 86138 |
24.23 |
| 2026-04-01 00:00 |
17:34:56.76 |
-29:59:08.5 |
HIP 86138 |
24.51 |
| 2026-04-01 12:00 |
17:34:56.85 |
-29:59:33.5 |
HIP 86138 |
24.81 |
| 2026-04-02 00:00 |
17:34:56.81 |
-29:59:58.4 |
HIP 86138 |
25.13 |
| 2026-04-02 12:00 |
17:34:56.65 |
-30:00:23.3 |
HIP 86138 |
25.47 |
| 2026-04-03 00:00 |
17:34:56.35 |
-30:00:48.1 |
HIP 86138 |
25.83 |
| 2026-04-03 12:00 |
17:34:55.93 |
-30:01:12.8 |
HIP 86138 |
26.21 |
| 2026-04-04 00:00 |
17:34:55.37 |
-30:01:37.4 |
HIP 86138 |
26.60 |
| 2026-04-04 12:00 |
17:34:54.68 |
-30:02:01.9 |
HIP 86138 |
27.02 |
| 2026-04-05 00:00 |
17:34:53.86 |
-30:02:26.3 |
HIP 86138 |
27.45 |
| 2026-04-05 12:00 |
17:34:52.92 |
-30:02:50.6 |
HIP 86138 |
27.89 |
| 2026-04-06 00:00 |
17:34:51.84 |
-30:03:14.8 |
HIP 86138 |
28.35 |
| 2026-04-06 12:00 |
17:34:50.63 |
-30:03:39.0 |
HIP 86138 |
28.83 |
| 2026-04-07 00:00 |
17:34:49.29 |
-30:04:03.0 |
HIP 86138 |
29.33 |
| 2026-04-07 12:00 |
17:34:47.82 |
-30:04:26.9 |
HIP 86138 |
29.84 |
| 2026-04-08 00:00 |
17:34:46.22 |
-30:04:50.7 |
HIP 86138 |
30.36 |
| 2026-04-08 12:00 |
17:34:44.48 |
-30:05:14.3 |
HIP 86138 |
30.90 |
| 2026-04-09 00:00 |
17:34:42.62 |
-30:05:37.9 |
HIP 86138 |
31.46 |
| 2026-04-09 12:00 |
17:34:40.63 |
-30:06:01.4 |
HIP 86138 |
32.03 |
| 2026-04-10 00:00 |
17:34:38.51 |
-30:06:24.7 |
HIP 86138 |
32.62 |
| 2026-04-10 12:00 |
17:34:36.25 |
-30:06:47.9 |
HIP 86140 |
33.10 |
| 2026-04-11 00:00 |
17:34:33.87 |
-30:07:11.0 |
HIP 86140 |
33.13 |
| 2026-04-11 12:00 |
17:34:31.36 |
-30:07:34.0 |
HIP 86140 |
33.19 |
| 2026-04-12 00:00 |
17:34:28.72 |
-30:07:56.9 |
HIP 86140 |
33.29 |
| 2026-04-12 12:00 |
17:34:25.94 |
-30:08:19.6 |
HIP 86140 |
33.42 |
| 2026-04-13 00:00 |
17:34:23.04 |
-30:08:42.2 |
HIP 86140 |
33.58 |
| 2026-04-13 12:00 |
17:34:20.01 |
-30:09:04.6 |
HIP 86140 |
33.79 |
| 2026-04-14 00:00 |
17:34:16.85 |
-30:09:26.9 |
HIP 85803 |
33.64 |
| 2026-04-14 12:00 |
17:34:13.56 |
-30:09:49.1 |
HIP 85803 |
32.83 |
| 2026-04-15 00:00 |
17:34:10.15 |
-30:10:11.2 |
HIP 85803 |
32.01 |
| 2026-04-15 12:00 |
17:34:06.60 |
-30:10:33.0 |
HIP 85803 |
31.16 |
| 2026-04-16 00:00 |
17:34:02.93 |
-30:10:54.8 |
HIP 85803 |
30.29 |