438P/Christensen
メタデータ
| 項目 |
値 |
| Designation |
438P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-04-11T20:00:18.210240Z |
| Orbit solution date (soln_date, UTC) |
2025-01-02T20:13:02Z |
| Obs used |
104 |
| NEO |
- |
| M1 |
17.100 |
| K1 |
6.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-07-31T10:04:40.224000Z |
| Discovery magnitude (MPC) |
22.50 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-02-24.0000000 |
| e |
0.42227439 |
| q (au) |
2.209438 |
| a (au) |
3.824373 |
| i (deg) |
8.338405 |
| Ω (om, deg) |
260.613633 |
| ω (w, deg) |
58.380791 |
| M (ma, deg) |
138.131880 |
等級
散乱 + 全体線形
$$
M_a = (15.632 + 3.815\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.632 |
| n |
3.815 |
| gf |
1.000 |
| gb |
-0.930 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
13:18:15.99 |
-17:29:10.1 |
HIP 64944 |
22.28 |
| 2026-02-03 12:00 |
13:18:18.24 |
-17:30:17.6 |
HIP 64944 |
23.19 |
| 2026-02-04 00:00 |
13:18:20.26 |
-17:31:23.8 |
HIP 64944 |
24.13 |
| 2026-02-04 12:00 |
13:18:22.04 |
-17:32:28.6 |
HIP 64944 |
25.08 |
| 2026-02-05 00:00 |
13:18:23.60 |
-17:33:32.2 |
HIP 64944 |
26.04 |
| 2026-02-05 12:00 |
13:18:24.92 |
-17:34:34.3 |
HIP 64944 |
26.99 |
| 2026-02-06 00:00 |
13:18:26.01 |
-17:35:35.2 |
HIP 64944 |
27.95 |
| 2026-02-06 12:00 |
13:18:26.86 |
-17:36:34.6 |
HIP 64944 |
28.89 |
| 2026-02-07 00:00 |
13:18:27.48 |
-17:37:32.7 |
HIP 64944 |
29.83 |
| 2026-02-07 12:00 |
13:18:27.86 |
-17:38:29.4 |
HIP 64944 |
30.75 |
| 2026-02-08 00:00 |
13:18:28.01 |
-17:39:24.7 |
HIP 64944 |
31.66 |
| 2026-02-08 12:00 |
13:18:27.92 |
-17:40:18.6 |
HIP 64944 |
32.55 |
| 2026-02-09 00:00 |
13:18:27.59 |
-17:41:11.0 |
HIP 64944 |
33.43 |
| 2026-02-09 12:00 |
13:18:27.02 |
-17:42:02.1 |
HIP 64944 |
34.29 |
| 2026-02-10 00:00 |
13:18:26.22 |
-17:42:51.7 |
HIP 64944 |
35.14 |
| 2026-02-10 12:00 |
13:18:25.17 |
-17:43:39.8 |
HIP 64924 |
34.85 |
| 2026-02-11 00:00 |
13:18:23.88 |
-17:44:26.5 |
HIP 64924 |
34.08 |
| 2026-02-11 12:00 |
13:18:22.36 |
-17:45:11.7 |
HIP 64924 |
33.33 |
| 2026-02-12 00:00 |
13:18:20.59 |
-17:45:55.4 |
HIP 64924 |
32.61 |
| 2026-02-12 12:00 |
13:18:18.58 |
-17:46:37.6 |
HIP 64924 |
31.93 |
| 2026-02-13 00:00 |
13:18:16.33 |
-17:47:18.3 |
HIP 64924 |
31.28 |
| 2026-02-13 12:00 |
13:18:13.83 |
-17:47:57.6 |
HIP 64924 |
30.67 |
| 2026-02-14 00:00 |
13:18:11.09 |
-17:48:35.2 |
HIP 64924 |
30.11 |
| 2026-02-14 12:00 |
13:18:08.11 |
-17:49:11.4 |
HIP 64924 |
29.60 |
| 2026-02-15 00:00 |
13:18:04.89 |
-17:49:46.0 |
HIP 64924 |
29.14 |
| 2026-02-15 12:00 |
13:18:01.42 |
-17:50:19.1 |
HIP 64924 |
28.75 |
| 2026-02-16 00:00 |
13:17:57.71 |
-17:50:50.5 |
HIP 64924 |
28.42 |
| 2026-02-16 12:00 |
13:17:53.75 |
-17:51:20.5 |
HIP 64924 |
28.17 |
| 2026-02-17 00:00 |
13:17:49.55 |
-17:51:48.8 |
HIP 64924 |
28.00 |
| 2026-02-17 12:00 |
13:17:45.11 |
-17:52:15.6 |
HIP 64924 |
27.91 |
| 2026-02-18 00:00 |
13:17:40.43 |
-17:52:40.7 |
HIP 64924 |
27.92 |
| 2026-02-18 12:00 |
13:17:35.50 |
-17:53:04.3 |
HIP 64924 |
28.03 |
| 2026-02-19 00:00 |
13:17:30.33 |
-17:53:26.2 |
HIP 64924 |
28.24 |
| 2026-02-19 12:00 |
13:17:24.91 |
-17:53:46.5 |
HIP 64924 |
28.56 |
| 2026-02-20 00:00 |
13:17:19.25 |
-17:54:05.2 |
HIP 64924 |
29.00 |
| 2026-02-20 12:00 |
13:17:13.35 |
-17:54:22.2 |
HIP 64924 |
29.54 |
| 2026-02-21 00:00 |
13:17:07.21 |
-17:54:37.6 |
HIP 64924 |
30.20 |
| 2026-02-21 12:00 |
13:17:00.83 |
-17:54:51.4 |
HIP 64924 |
30.98 |
| 2026-02-22 00:00 |
13:16:54.21 |
-17:55:03.5 |
HIP 64924 |
31.87 |
| 2026-02-22 12:00 |
13:16:47.35 |
-17:55:13.9 |
HIP 64924 |
32.87 |
| 2026-02-23 00:00 |
13:16:40.24 |
-17:55:22.6 |
HIP 64672 |
33.05 |
| 2026-02-23 12:00 |
13:16:32.90 |
-17:55:29.7 |
HIP 64672 |
32.19 |
| 2026-02-24 00:00 |
13:16:25.33 |
-17:55:35.1 |
HIP 64672 |
31.34 |