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) |
| 2026-03-26 00:00 |
02:10:11.36 |
+11:53:52.9 |
HIP 10118 |
12.98 |
| 2026-03-26 12:00 |
02:10:45.02 |
+11:57:21.4 |
HIP 10118 |
13.12 |
| 2026-03-27 00:00 |
02:11:18.78 |
+12:00:49.9 |
HIP 10118 |
18.33 |
| 2026-03-27 12:00 |
02:11:52.62 |
+12:04:18.4 |
HIP 10197 |
18.68 |
| 2026-03-28 00:00 |
02:12:26.56 |
+12:07:47.0 |
HIP 10310 |
17.36 |
| 2026-03-28 12:00 |
02:13:00.58 |
+12:11:15.6 |
HIP 10376 |
17.66 |
| 2026-03-29 00:00 |
02:13:34.69 |
+12:14:44.3 |
HIP 10415 |
9.54 |
| 2026-03-29 12:00 |
02:14:08.89 |
+12:18:12.9 |
HIP 10415 |
1.49 |
| 2026-03-30 00:00 |
02:14:43.18 |
+12:21:41.6 |
HIP 10472 |
8.39 |
| 2026-03-30 12:00 |
02:15:17.56 |
+12:25:10.4 |
HIP 10472 |
11.60 |
| 2026-03-31 00:00 |
02:15:52.02 |
+12:28:39.1 |
HIP 10599 |
10.46 |
| 2026-03-31 12:00 |
02:16:26.57 |
+12:32:07.8 |
HIP 10599 |
9.32 |
| 2026-04-01 00:00 |
02:17:01.21 |
+12:35:36.6 |
HIP 10599 |
15.20 |
| 2026-04-01 12:00 |
02:17:35.93 |
+12:39:05.3 |
HIP 10599 |
23.30 |
| 2026-04-02 00:00 |
02:18:10.74 |
+12:42:34.0 |
HIP 10784 |
19.73 |
| 2026-04-02 12:00 |
02:18:45.63 |
+12:46:02.7 |
HIP 10784 |
13.58 |
| 2026-04-03 00:00 |
02:19:20.61 |
+12:49:31.4 |
HIP 10784 |
12.19 |
| 2026-04-03 12:00 |
02:19:55.67 |
+12:53:00.1 |
HIP 10784 |
16.82 |
| 2026-04-04 00:00 |
02:20:30.81 |
+12:56:28.8 |
HIP 10784 |
24.25 |
| 2026-04-04 12:00 |
02:21:06.04 |
+12:59:57.4 |
HIP 11042 |
19.36 |
| 2026-04-05 00:00 |
02:21:41.35 |
+13:03:26.0 |
HIP 11042 |
10.49 |
| 2026-04-05 12:00 |
02:22:16.75 |
+13:06:54.5 |
HIP 11042 |
4.16 |
| 2026-04-06 00:00 |
02:22:52.23 |
+13:10:23.0 |
HIP 11042 |
9.88 |
| 2026-04-06 12:00 |
02:23:27.79 |
+13:13:51.5 |
HIP 11042 |
18.76 |
| 2026-04-07 00:00 |
02:24:03.43 |
+13:17:19.9 |
HIP 11271 |
17.38 |
| 2026-04-07 12:00 |
02:24:39.15 |
+13:20:48.2 |
HIP 11271 |
8.03 |
| 2026-04-08 00:00 |
02:25:14.95 |
+13:24:16.5 |
HIP 11271 |
1.41 |
| 2026-04-08 12:00 |
02:25:50.84 |
+13:27:44.7 |
HIP 11271 |
10.75 |
| 2026-04-09 00:00 |
02:26:26.80 |
+13:31:12.8 |
HIP 11271 |
20.16 |
| 2026-04-09 12:00 |
02:27:02.85 |
+13:34:40.8 |
HIP 11422 |
23.73 |
| 2026-04-10 00:00 |
02:27:38.97 |
+13:38:08.8 |
HIP 11522 |
19.73 |
| 2026-04-10 12:00 |
02:28:15.17 |
+13:41:36.7 |
HIP 11522 |
11.93 |
| 2026-04-11 00:00 |
02:28:51.46 |
+13:45:04.5 |
HIP 11522 |
8.60 |
| 2026-04-11 12:00 |
02:29:27.82 |
+13:48:32.2 |
HIP 11522 |
13.61 |
| 2026-04-12 00:00 |
02:30:04.25 |
+13:51:59.7 |
HIP 11700 |
13.65 |
| 2026-04-12 12:00 |
02:30:40.77 |
+13:55:27.2 |
HIP 11700 |
4.18 |
| 2026-04-13 00:00 |
02:31:17.36 |
+13:58:54.6 |
HIP 11700 |
5.45 |
| 2026-04-13 12:00 |
02:31:54.03 |
+14:02:21.8 |
HIP 11700 |
14.96 |
| 2026-04-14 00:00 |
02:32:30.78 |
+14:05:48.9 |
HIP 11700 |
24.51 |
| 2026-04-14 12:00 |
02:33:07.60 |
+14:09:15.9 |
HIP 11884 |
33.65 |
| 2026-04-15 00:00 |
02:33:44.50 |
+14:12:42.8 |
HIP 12025 |
28.14 |
| 2026-04-15 12:00 |
02:34:21.47 |
+14:16:09.5 |
HIP 12025 |
19.89 |
| 2026-04-16 00:00 |
02:34:58.52 |
+14:19:36.0 |
HIP 12025 |
13.54 |