メタデータ
| 項目 |
値 |
| Designation |
298P/Christensen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-03-05T06:56:45.335040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:17Z |
| Obs used |
145 |
| NEO |
- |
| M1 |
16.100 |
| K1 |
8.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2007-08-29.0000000 |
| e |
0.41245123 |
| q (au) |
2.050749 |
| a (au) |
3.490347 |
| i (deg) |
8.021637 |
| Ω (om, deg) |
57.117855 |
| ω (w, deg) |
95.623968 |
| M (ma, deg) |
26.709372 |
等級
散乱 + 全体線形
$$
M_a = (13.973 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.973 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-05-12 00:00 |
03:08:35.94 |
+17:13:14.3 |
HIP 14569 |
13.57 |
| 2026-05-12 12:00 |
03:09:16.32 |
+17:16:26.5 |
HIP 14682 |
5.84 |
| 2026-05-13 00:00 |
03:09:56.75 |
+17:19:38.3 |
HIP 14682 |
5.55 |
| 2026-05-13 12:00 |
03:10:37.24 |
+17:22:49.7 |
HIP 14682 |
15.31 |
| 2026-05-14 00:00 |
03:11:17.79 |
+17:26:00.7 |
HIP 14901 |
16.04 |
| 2026-05-14 12:00 |
03:11:58.38 |
+17:29:11.4 |
HIP 14901 |
11.91 |
| 2026-05-15 00:00 |
03:12:39.03 |
+17:32:21.6 |
HIP 14901 |
15.30 |
| 2026-05-15 12:00 |
03:13:19.73 |
+17:35:31.5 |
HIP 15052 |
20.08 |
| 2026-05-16 00:00 |
03:14:00.49 |
+17:38:40.9 |
HIP 15052 |
14.65 |
| 2026-05-16 12:00 |
03:14:41.29 |
+17:41:49.9 |
HIP 15052 |
15.31 |
| 2026-05-17 00:00 |
03:15:22.14 |
+17:44:58.5 |
HIP 15098 |
18.81 |
| 2026-05-17 12:00 |
03:16:03.04 |
+17:48:06.7 |
HIP 15285 |
21.48 |
| 2026-05-18 00:00 |
03:16:43.99 |
+17:51:14.5 |
HIP 15285 |
18.17 |
| 2026-05-18 12:00 |
03:17:24.99 |
+17:54:21.8 |
HIP 15285 |
20.21 |
| 2026-05-19 00:00 |
03:18:06.04 |
+17:57:28.8 |
HIP 15381 |
13.26 |
| 2026-05-19 12:00 |
03:18:47.14 |
+18:00:35.2 |
HIP 15381 |
11.66 |
| 2026-05-20 00:00 |
03:19:28.28 |
+18:03:41.3 |
HIP 15381 |
17.52 |
| 2026-05-20 12:00 |
03:20:09.47 |
+18:06:46.9 |
HIP 15381 |
26.24 |
| 2026-05-21 00:00 |
03:20:50.70 |
+18:09:52.0 |
HIP 15588 |
34.39 |
| 2026-05-21 12:00 |
03:21:31.98 |
+18:12:56.7 |
HIP 15724 |
32.76 |
| 2026-05-22 00:00 |
03:22:13.31 |
+18:16:01.0 |
HIP 15808 |
26.81 |
| 2026-05-22 12:00 |
03:22:54.68 |
+18:19:04.8 |
HIP 15808 |
17.80 |
| 2026-05-23 00:00 |
03:23:36.09 |
+18:22:08.1 |
HIP 15808 |
11.24 |
| 2026-05-23 12:00 |
03:24:17.55 |
+18:25:11.0 |
HIP 15808 |
12.16 |
| 2026-05-24 00:00 |
03:24:59.06 |
+18:28:13.4 |
HIP 15808 |
19.53 |
| 2026-05-24 12:00 |
03:25:40.60 |
+18:31:15.3 |
HIP 16077 |
24.14 |
| 2026-05-25 00:00 |
03:26:22.19 |
+18:34:16.8 |
HIP 16077 |
14.76 |
| 2026-05-25 12:00 |
03:27:03.82 |
+18:37:17.8 |
HIP 16077 |
8.10 |
| 2026-05-26 00:00 |
03:27:45.50 |
+18:40:18.3 |
HIP 16077 |
11.23 |
| 2026-05-26 12:00 |
03:28:27.21 |
+18:43:18.3 |
HIP 16136 |
12.25 |
| 2026-05-27 00:00 |
03:29:08.97 |
+18:46:17.9 |
HIP 16271 |
9.25 |
| 2026-05-27 12:00 |
03:29:50.77 |
+18:49:17.0 |
HIP 16271 |
5.05 |
| 2026-05-28 00:00 |
03:30:32.61 |
+18:52:15.6 |
HIP 16374 |
7.00 |
| 2026-05-28 12:00 |
03:31:14.49 |
+18:55:13.7 |
HIP 16374 |
8.47 |
| 2026-05-29 00:00 |
03:31:56.41 |
+18:58:11.3 |
HIP 16441 |
10.61 |
| 2026-05-29 12:00 |
03:32:38.38 |
+19:01:08.4 |
HIP 16441 |
18.41 |
| 2026-05-30 00:00 |
03:33:20.38 |
+19:04:05.0 |
HIP 16551 |
19.15 |
| 2026-05-30 12:00 |
03:34:02.42 |
+19:07:01.1 |
HIP 16674 |
16.48 |
| 2026-05-31 00:00 |
03:34:44.50 |
+19:09:56.7 |
HIP 16707 |
9.42 |
| 2026-05-31 12:00 |
03:35:26.63 |
+19:12:51.8 |
HIP 16707 |
8.89 |
| 2026-06-01 00:00 |
03:36:08.79 |
+19:15:46.4 |
HIP 16707 |
16.86 |
| 2026-06-01 12:00 |
03:36:50.99 |
+19:18:40.5 |
HIP 16808 |
16.43 |
| 2026-06-02 00:00 |
03:37:33.22 |
+19:21:34.1 |
HIP 16961 |
8.89 |