メタデータ
| 項目 |
値 |
| Designation |
438P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-04-12T02:55:56.516160Z |
| Orbit solution date (soln_date, UTC) |
2026-06-09T11:12:48Z |
| Obs used |
115 |
| NEO |
- |
| M1 |
17.500 |
| K1 |
5.500 |
| 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) |
2008-08-09.0000000 |
| e |
0.42236565 |
| q (au) |
2.209059 |
| a (au) |
3.824320 |
| i (deg) |
8.337130 |
| Ω (om, deg) |
260.604941 |
| ω (w, deg) |
58.403241 |
| M (ma, deg) |
160.105137 |
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) |
| 2026-07-29 00:00 |
12:51:39.52 |
-11:54:28.2 |
HIP 62740 |
6.08 |
| 2026-07-29 12:00 |
12:52:02.63 |
-11:55:46.3 |
HIP 62740 |
11.60 |
| 2026-07-30 00:00 |
12:52:25.91 |
-11:57:05.6 |
HIP 62740 |
17.35 |
| 2026-07-30 12:00 |
12:52:49.34 |
-11:58:26.1 |
HIP 62740 |
23.19 |
| 2026-07-31 00:00 |
12:53:12.94 |
-11:59:47.7 |
HIP 62983 |
26.37 |
| 2026-07-31 12:00 |
12:53:36.70 |
-12:01:10.5 |
HIP 62983 |
24.52 |
| 2026-08-01 00:00 |
12:54:00.61 |
-12:02:34.4 |
HIP 62983 |
24.07 |
| 2026-08-01 12:00 |
12:54:24.68 |
-12:03:59.4 |
HIP 62983 |
25.12 |
| 2026-08-02 00:00 |
12:54:48.91 |
-12:05:25.5 |
HIP 62983 |
27.52 |
| 2026-08-02 12:00 |
12:55:13.30 |
-12:06:52.8 |
HIP 63189 |
24.22 |
| 2026-08-03 00:00 |
12:55:37.84 |
-12:08:21.2 |
HIP 63189 |
19.79 |
| 2026-08-03 12:00 |
12:56:02.53 |
-12:09:50.7 |
HIP 63189 |
16.52 |
| 2026-08-04 00:00 |
12:56:27.38 |
-12:11:21.2 |
HIP 63220 |
13.28 |
| 2026-08-04 12:00 |
12:56:52.39 |
-12:12:52.9 |
HIP 63220 |
10.16 |
| 2026-08-05 00:00 |
12:57:17.54 |
-12:14:25.7 |
HIP 63220 |
10.48 |
| 2026-08-05 12:00 |
12:57:42.85 |
-12:15:59.5 |
HIP 63220 |
14.06 |
| 2026-08-06 00:00 |
12:58:08.32 |
-12:17:34.4 |
HIP 63313 |
14.34 |
| 2026-08-06 12:00 |
12:58:33.93 |
-12:19:10.3 |
HIP 63313 |
11.65 |
| 2026-08-07 00:00 |
12:58:59.69 |
-12:20:47.4 |
HIP 63313 |
12.22 |
| 2026-08-07 12:00 |
12:59:25.61 |
-12:22:25.4 |
HIP 63313 |
15.75 |
| 2026-08-08 00:00 |
12:59:51.67 |
-12:24:04.5 |
HIP 63313 |
20.82 |
| 2026-08-08 12:00 |
13:00:17.88 |
-12:25:44.7 |
HIP 63543 |
18.12 |
| 2026-08-09 00:00 |
13:00:44.24 |
-12:27:25.9 |
HIP 63543 |
12.34 |
| 2026-08-09 12:00 |
13:01:10.75 |
-12:29:08.1 |
HIP 63543 |
8.03 |
| 2026-08-10 00:00 |
13:01:37.40 |
-12:30:51.3 |
HIP 63543 |
8.15 |
| 2026-08-10 12:00 |
13:02:04.20 |
-12:32:35.5 |
HIP 63543 |
12.63 |
| 2026-08-11 00:00 |
13:02:31.15 |
-12:34:20.7 |
HIP 63543 |
18.58 |
| 2026-08-11 12:00 |
13:02:58.24 |
-12:36:06.9 |
HIP 63709 |
23.51 |
| 2026-08-12 00:00 |
13:03:25.47 |
-12:37:54.1 |
HIP 63709 |
20.98 |
| 2026-08-12 12:00 |
13:03:52.85 |
-12:39:42.3 |
HIP 63709 |
20.54 |
| 2026-08-13 00:00 |
13:04:20.36 |
-12:41:31.4 |
HIP 63709 |
22.36 |
| 2026-08-13 12:00 |
13:04:48.03 |
-12:43:21.5 |
HIP 63897 |
25.01 |
| 2026-08-14 00:00 |
13:05:15.83 |
-12:45:12.6 |
HIP 63897 |
23.92 |
| 2026-08-14 12:00 |
13:05:43.77 |
-12:47:04.6 |
HIP 63897 |
24.88 |
| 2026-08-15 00:00 |
13:06:11.85 |
-12:48:57.5 |
HIP 64032 |
19.74 |
| 2026-08-15 12:00 |
13:06:40.07 |
-12:50:51.3 |
HIP 64032 |
15.22 |
| 2026-08-16 00:00 |
13:07:08.42 |
-12:52:46.1 |
HIP 64032 |
13.25 |
| 2026-08-16 12:00 |
13:07:36.92 |
-12:54:41.8 |
HIP 64093 |
14.30 |
| 2026-08-17 00:00 |
13:08:05.54 |
-12:56:38.3 |
HIP 64093 |
10.45 |
| 2026-08-17 12:00 |
13:08:34.31 |
-12:58:35.8 |
HIP 64093 |
10.90 |
| 2026-08-18 00:00 |
13:09:03.21 |
-13:00:34.1 |
HIP 64093 |
15.33 |
| 2026-08-18 12:00 |
13:09:32.24 |
-13:02:33.3 |
HIP 64093 |
21.43 |
| 2026-08-19 00:00 |
13:10:01.40 |
-13:04:33.3 |
HIP 64356 |
21.79 |