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 · University of Arizona 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
12:29:27.54 |
-12:04:08.1 |
HIP 60981 |
7.56 |
| 2026-06-01 12:00 |
12:29:25.68 |
-12:02:34.0 |
HIP 60981 |
8.13 |
| 2026-06-02 00:00 |
12:29:24.07 |
-12:01:01.4 |
HIP 60981 |
8.89 |
| 2026-06-02 12:00 |
12:29:22.72 |
-11:59:30.3 |
HIP 60981 |
9.79 |
| 2026-06-03 00:00 |
12:29:21.62 |
-11:58:00.7 |
HIP 60981 |
10.78 |
| 2026-06-03 12:00 |
12:29:20.77 |
-11:56:32.6 |
HIP 60981 |
11.81 |
| 2026-06-04 00:00 |
12:29:20.17 |
-11:55:06.0 |
HIP 60878 |
12.49 |
| 2026-06-04 12:00 |
12:29:19.83 |
-11:53:40.9 |
HIP 60878 |
13.25 |
| 2026-06-05 00:00 |
12:29:19.74 |
-11:52:17.4 |
HIP 60878 |
14.15 |
| 2026-06-05 12:00 |
12:29:19.90 |
-11:50:55.4 |
HIP 60878 |
15.14 |
| 2026-06-06 00:00 |
12:29:20.32 |
-11:49:34.9 |
HIP 60878 |
16.21 |
| 2026-06-06 12:00 |
12:29:20.99 |
-11:48:16.0 |
HIP 60878 |
17.33 |
| 2026-06-07 00:00 |
12:29:21.91 |
-11:46:58.6 |
HIP 60878 |
18.50 |
| 2026-06-07 12:00 |
12:29:23.08 |
-11:45:42.9 |
HIP 60878 |
19.69 |
| 2026-06-08 00:00 |
12:29:24.50 |
-11:44:28.6 |
HIP 60878 |
20.91 |
| 2026-06-08 12:00 |
12:29:26.17 |
-11:43:16.0 |
HIP 60981 |
22.12 |
| 2026-06-09 00:00 |
12:29:28.10 |
-11:42:04.9 |
HIP 60981 |
23.07 |
| 2026-06-09 12:00 |
12:29:30.27 |
-11:40:55.4 |
HIP 60981 |
24.01 |
| 2026-06-10 00:00 |
12:29:32.70 |
-11:39:47.5 |
HIP 60981 |
24.94 |
| 2026-06-10 12:00 |
12:29:35.37 |
-11:38:41.2 |
HIP 60981 |
25.86 |
| 2026-06-11 00:00 |
12:29:38.30 |
-11:37:36.5 |
HIP 60981 |
26.78 |
| 2026-06-11 12:00 |
12:29:41.47 |
-11:36:33.3 |
HIP 60981 |
27.68 |
| 2026-06-12 00:00 |
12:29:44.90 |
-11:35:31.8 |
HIP 60981 |
28.59 |
| 2026-06-12 12:00 |
12:29:48.57 |
-11:34:31.9 |
HIP 60981 |
29.49 |
| 2026-06-13 00:00 |
12:29:52.49 |
-11:33:33.7 |
HIP 60981 |
30.40 |
| 2026-06-13 12:00 |
12:29:56.66 |
-11:32:37.0 |
HIP 60981 |
31.31 |
| 2026-06-14 00:00 |
12:30:01.07 |
-11:31:42.0 |
HIP 60981 |
32.23 |
| 2026-06-14 12:00 |
12:30:05.74 |
-11:30:48.6 |
HIP 60981 |
33.16 |
| 2026-06-15 00:00 |
12:30:10.65 |
-11:29:56.8 |
HIP 61125 |
32.92 |
| 2026-06-15 12:00 |
12:30:15.80 |
-11:29:06.6 |
HIP 61125 |
31.47 |
| 2026-06-16 00:00 |
12:30:21.20 |
-11:28:18.1 |
HIP 61125 |
30.01 |
| 2026-06-16 12:00 |
12:30:26.84 |
-11:27:31.2 |
HIP 61125 |
28.56 |
| 2026-06-17 00:00 |
12:30:32.73 |
-11:26:45.9 |
HIP 61125 |
27.10 |
| 2026-06-17 12:00 |
12:30:38.86 |
-11:26:02.3 |
HIP 61125 |
25.65 |
| 2026-06-18 00:00 |
12:30:45.23 |
-11:25:20.3 |
HIP 61125 |
24.23 |
| 2026-06-18 12:00 |
12:30:51.85 |
-11:24:40.0 |
HIP 61125 |
22.84 |
| 2026-06-19 00:00 |
12:30:58.70 |
-11:24:01.2 |
HIP 61125 |
21.50 |
| 2026-06-19 12:00 |
12:31:05.79 |
-11:23:24.1 |
HIP 61125 |
20.24 |
| 2026-06-20 00:00 |
12:31:13.12 |
-11:22:48.6 |
HIP 61125 |
19.09 |
| 2026-06-20 12:00 |
12:31:20.69 |
-11:22:14.8 |
HIP 61125 |
18.07 |
| 2026-06-21 00:00 |
12:31:28.50 |
-11:21:42.5 |
HIP 61125 |
17.23 |
| 2026-06-21 12:00 |
12:31:36.54 |
-11:21:11.9 |
HIP 61125 |
16.61 |
| 2026-06-22 00:00 |
12:31:44.81 |
-11:20:42.9 |
HIP 61125 |
16.27 |