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
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) |
| 2026-03-26 00:00 |
13:02:26.47 |
-17:07:23.2 |
HIP 63672 |
16.29 |
| 2026-03-26 12:00 |
13:02:07.46 |
-17:05:42.1 |
HIP 63672 |
17.54 |
| 2026-03-27 00:00 |
13:01:48.35 |
-17:03:59.5 |
HIP 63672 |
19.92 |
| 2026-03-27 12:00 |
13:01:29.15 |
-17:02:15.3 |
HIP 63672 |
23.11 |
| 2026-03-28 00:00 |
13:01:09.85 |
-17:00:29.5 |
HIP 63672 |
26.84 |
| 2026-03-28 12:00 |
13:00:50.47 |
-16:58:42.3 |
HIP 63672 |
30.93 |
| 2026-03-29 00:00 |
13:00:31.00 |
-16:56:53.5 |
HIP 63393 |
29.30 |
| 2026-03-29 12:00 |
13:00:11.45 |
-16:55:03.3 |
HIP 63393 |
25.44 |
| 2026-03-30 00:00 |
12:59:51.82 |
-16:53:11.6 |
HIP 63393 |
22.04 |
| 2026-03-30 12:00 |
12:59:32.11 |
-16:51:18.4 |
HIP 63393 |
19.34 |
| 2026-03-31 00:00 |
12:59:12.34 |
-16:49:23.8 |
HIP 63393 |
17.70 |
| 2026-03-31 12:00 |
12:58:52.50 |
-16:47:27.7 |
HIP 63393 |
17.45 |
| 2026-04-01 00:00 |
12:58:32.59 |
-16:45:30.3 |
HIP 63393 |
18.65 |
| 2026-04-01 12:00 |
12:58:12.63 |
-16:43:31.5 |
HIP 63393 |
21.08 |
| 2026-04-02 00:00 |
12:57:52.61 |
-16:41:31.3 |
HIP 63178 |
17.82 |
| 2026-04-02 12:00 |
12:57:32.55 |
-16:39:29.7 |
HIP 63178 |
13.53 |
| 2026-04-03 00:00 |
12:57:12.43 |
-16:37:26.8 |
HIP 63178 |
10.15 |
| 2026-04-03 12:00 |
12:56:52.27 |
-16:35:22.7 |
HIP 63178 |
8.84 |
| 2026-04-04 00:00 |
12:56:32.08 |
-16:33:17.2 |
HIP 63178 |
10.43 |
| 2026-04-04 12:00 |
12:56:11.84 |
-16:31:10.4 |
HIP 63178 |
13.98 |
| 2026-04-05 00:00 |
12:55:51.58 |
-16:29:02.4 |
HIP 63178 |
18.42 |
| 2026-04-05 12:00 |
12:55:31.29 |
-16:26:53.2 |
HIP 63178 |
23.23 |
| 2026-04-06 00:00 |
12:55:10.97 |
-16:24:42.7 |
HIP 63178 |
28.25 |
| 2026-04-06 12:00 |
12:54:50.64 |
-16:22:31.1 |
HIP 62878 |
26.95 |
| 2026-04-07 00:00 |
12:54:30.29 |
-16:20:18.3 |
HIP 62878 |
24.14 |
| 2026-04-07 12:00 |
12:54:09.93 |
-16:18:04.3 |
HIP 62878 |
22.28 |
| 2026-04-08 00:00 |
12:53:49.57 |
-16:15:49.3 |
HIP 62878 |
21.65 |
| 2026-04-08 12:00 |
12:53:29.20 |
-16:13:33.1 |
HIP 62878 |
22.35 |
| 2026-04-09 00:00 |
12:53:08.83 |
-16:11:15.9 |
HIP 62878 |
24.28 |
| 2026-04-09 12:00 |
12:52:48.47 |
-16:08:57.6 |
HIP 62878 |
27.17 |
| 2026-04-10 00:00 |
12:52:28.12 |
-16:06:38.3 |
HIP 62768 |
27.18 |
| 2026-04-10 12:00 |
12:52:07.79 |
-16:04:18.1 |
HIP 62768 |
23.43 |
| 2026-04-11 00:00 |
12:51:47.47 |
-16:01:56.8 |
HIP 62768 |
20.42 |
| 2026-04-11 12:00 |
12:51:27.17 |
-15:59:34.6 |
HIP 62768 |
18.53 |
| 2026-04-12 00:00 |
12:51:06.90 |
-15:57:11.5 |
HIP 62768 |
18.12 |
| 2026-04-12 12:00 |
12:50:46.66 |
-15:54:47.5 |
HIP 62610 |
14.77 |
| 2026-04-13 00:00 |
12:50:26.46 |
-15:52:22.6 |
HIP 62610 |
9.82 |
| 2026-04-13 12:00 |
12:50:06.30 |
-15:49:56.9 |
HIP 62610 |
5.81 |
| 2026-04-14 00:00 |
12:49:46.18 |
-15:47:30.4 |
HIP 62610 |
5.47 |
| 2026-04-14 12:00 |
12:49:26.11 |
-15:45:03.2 |
HIP 62610 |
9.22 |
| 2026-04-15 00:00 |
12:49:06.09 |
-15:42:35.1 |
HIP 62505 |
8.16 |
| 2026-04-15 12:00 |
12:48:46.13 |
-15:40:06.4 |
HIP 62505 |
4.53 |
| 2026-04-16 00:00 |
12:48:26.23 |
-15:37:37.0 |
HIP 62505 |
5.75 |