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
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 |
05:00:00.96 |
+23:46:56.3 |
HIP 23150 |
16.10 |
| 2026-07-29 12:00 |
05:00:44.26 |
+23:48:40.1 |
HIP 23270 |
21.58 |
| 2026-07-30 00:00 |
05:01:27.52 |
+23:50:23.3 |
HIP 23460 |
15.01 |
| 2026-07-30 12:00 |
05:02:10.76 |
+23:52:06.0 |
HIP 23460 |
5.01 |
| 2026-07-31 00:00 |
05:02:53.98 |
+23:53:48.0 |
HIP 23460 |
5.11 |
| 2026-07-31 12:00 |
05:03:37.16 |
+23:55:29.4 |
HIP 23460 |
15.09 |
| 2026-08-01 00:00 |
05:04:20.31 |
+23:57:10.2 |
HIP 23606 |
18.46 |
| 2026-08-01 12:00 |
05:05:03.43 |
+23:58:50.4 |
HIP 23606 |
20.99 |
| 2026-08-02 00:00 |
05:05:46.52 |
+24:00:30.0 |
HIP 23606 |
27.20 |
| 2026-08-02 12:00 |
05:06:29.58 |
+24:02:09.1 |
HIP 23900 |
26.07 |
| 2026-08-03 00:00 |
05:07:12.60 |
+24:03:47.5 |
HIP 23900 |
17.28 |
| 2026-08-03 12:00 |
05:07:55.59 |
+24:05:25.4 |
HIP 23900 |
10.79 |
| 2026-08-04 00:00 |
05:08:38.54 |
+24:07:02.7 |
HIP 23900 |
11.47 |
| 2026-08-04 12:00 |
05:09:21.46 |
+24:08:39.4 |
HIP 24007 |
11.30 |
| 2026-08-05 00:00 |
05:10:04.34 |
+24:10:15.5 |
HIP 24007 |
11.49 |
| 2026-08-05 12:00 |
05:10:47.18 |
+24:11:51.0 |
HIP 24007 |
18.24 |
| 2026-08-06 00:00 |
05:11:29.98 |
+24:13:26.0 |
HIP 24234 |
10.05 |
| 2026-08-06 12:00 |
05:12:12.74 |
+24:15:00.4 |
HIP 24234 |
1.77 |
| 2026-08-07 00:00 |
05:12:55.46 |
+24:16:34.2 |
HIP 24315 |
7.47 |
| 2026-08-07 12:00 |
05:13:38.14 |
+24:18:07.5 |
HIP 24315 |
9.74 |
| 2026-08-08 00:00 |
05:14:20.77 |
+24:19:40.2 |
HIP 24494 |
17.52 |
| 2026-08-08 12:00 |
05:15:03.36 |
+24:21:12.3 |
HIP 24494 |
10.44 |
| 2026-08-09 00:00 |
05:15:45.90 |
+24:22:43.9 |
HIP 24494 |
10.19 |
| 2026-08-09 12:00 |
05:16:28.40 |
+24:24:14.9 |
HIP 24494 |
17.05 |
| 2026-08-10 00:00 |
05:17:10.84 |
+24:25:45.4 |
HIP 24665 |
25.61 |
| 2026-08-10 12:00 |
05:17:53.24 |
+24:27:15.4 |
HIP 24665 |
27.11 |
| 2026-08-11 00:00 |
05:18:35.59 |
+24:28:44.7 |
HIP 24875 |
19.59 |
| 2026-08-11 12:00 |
05:19:17.88 |
+24:30:13.6 |
HIP 24875 |
10.81 |
| 2026-08-12 00:00 |
05:20:00.12 |
+24:31:41.9 |
HIP 24875 |
6.26 |
| 2026-08-12 12:00 |
05:20:42.30 |
+24:33:09.7 |
HIP 24875 |
12.26 |
| 2026-08-13 00:00 |
05:21:24.43 |
+24:34:36.9 |
HIP 24875 |
21.19 |
| 2026-08-13 12:00 |
05:22:06.50 |
+24:36:03.6 |
HIP 24994 |
26.20 |
| 2026-08-14 00:00 |
05:22:48.52 |
+24:37:29.9 |
HIP 25253 |
26.02 |
| 2026-08-14 12:00 |
05:23:30.47 |
+24:38:55.5 |
HIP 25253 |
19.96 |
| 2026-08-15 00:00 |
05:24:12.36 |
+24:40:20.7 |
HIP 25253 |
17.47 |
| 2026-08-15 12:00 |
05:24:54.20 |
+24:41:45.4 |
HIP 25253 |
19.92 |
| 2026-08-16 00:00 |
05:25:35.97 |
+24:43:09.6 |
HIP 25463 |
23.33 |
| 2026-08-16 12:00 |
05:26:17.67 |
+24:44:33.2 |
HIP 25463 |
17.20 |
| 2026-08-17 00:00 |
05:26:59.31 |
+24:45:56.4 |
HIP 25463 |
15.18 |
| 2026-08-17 12:00 |
05:27:40.89 |
+24:47:19.1 |
HIP 25463 |
18.62 |
| 2026-08-18 00:00 |
05:28:22.40 |
+24:48:41.3 |
HIP 25695 |
23.74 |
| 2026-08-18 12:00 |
05:29:03.84 |
+24:50:03.0 |
HIP 25695 |
19.18 |
| 2026-08-19 00:00 |
05:29:45.21 |
+24:51:24.3 |
HIP 25695 |
18.78 |