メタデータ
| 項目 |
値 |
| Designation |
C/2023 F2 (SOHO) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-03-21T03:59:23.654400Z |
| Orbit solution date (soln_date, UTC) |
2025-02-28T10:03:47Z |
| Obs used |
82 |
| NEO |
- |
| M1 |
20.800 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-03-21T00:06:17.568000Z |
| Discovery magnitude (MPC) |
4.90 V |
| Discovery observatory (MPC) |
249 · SOHO |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-03-21.0000000 |
| e |
1.01189649 |
| q (au) |
0.034240 |
| a (au) |
-2.878182 |
| i (deg) |
72.567452 |
| Ω (om, deg) |
71.422437 |
| ω (w, deg) |
57.765098 |
| M (ma, deg) |
-0.033557 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 3.781\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
3.781 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
17:22:23.11 |
-68:07:32.4 |
HIP 85095 |
13.35 |
| 2026-09-20 12:00 |
17:22:25.85 |
-68:06:25.5 |
HIP 85095 |
12.25 |
| 2026-09-21 00:00 |
17:22:28.73 |
-68:05:18.9 |
HIP 85095 |
11.16 |
| 2026-09-21 12:00 |
17:22:31.74 |
-68:04:12.4 |
HIP 85095 |
10.07 |
| 2026-09-22 00:00 |
17:22:34.90 |
-68:03:06.1 |
HIP 85095 |
8.99 |
| 2026-09-22 12:00 |
17:22:38.19 |
-68:02:00.1 |
HIP 85095 |
7.92 |
| 2026-09-23 00:00 |
17:22:41.62 |
-68:00:54.2 |
HIP 85095 |
6.87 |
| 2026-09-23 12:00 |
17:22:45.19 |
-67:59:48.5 |
HIP 85095 |
5.85 |
| 2026-09-24 00:00 |
17:22:48.90 |
-67:58:43.1 |
HIP 85095 |
4.87 |
| 2026-09-24 12:00 |
17:22:52.74 |
-67:57:37.9 |
HIP 85095 |
3.98 |
| 2026-09-25 00:00 |
17:22:56.72 |
-67:56:32.8 |
HIP 85095 |
3.23 |
| 2026-09-25 12:00 |
17:23:00.83 |
-67:55:28.1 |
HIP 85095 |
2.76 |
| 2026-09-26 00:00 |
17:23:05.08 |
-67:54:23.5 |
HIP 85095 |
2.71 |
| 2026-09-26 12:00 |
17:23:09.45 |
-67:53:19.1 |
HIP 85095 |
3.10 |
| 2026-09-27 00:00 |
17:23:13.96 |
-67:52:15.0 |
HIP 85095 |
3.81 |
| 2026-09-27 12:00 |
17:23:18.60 |
-67:51:11.1 |
HIP 85095 |
4.69 |
| 2026-09-28 00:00 |
17:23:23.37 |
-67:50:07.5 |
HIP 85095 |
5.66 |
| 2026-09-28 12:00 |
17:23:28.27 |
-67:49:04.1 |
HIP 85095 |
6.68 |
| 2026-09-29 00:00 |
17:23:33.30 |
-67:48:01.0 |
HIP 85095 |
7.74 |
| 2026-09-29 12:00 |
17:23:38.46 |
-67:46:58.0 |
HIP 85095 |
8.81 |
| 2026-09-30 00:00 |
17:23:43.75 |
-67:45:55.4 |
HIP 84969 |
9.86 |
| 2026-09-30 12:00 |
17:23:49.16 |
-67:44:53.0 |
HIP 84969 |
10.46 |
| 2026-10-01 00:00 |
17:23:54.70 |
-67:43:50.8 |
HIP 84969 |
11.16 |
| 2026-10-01 12:00 |
17:24:00.36 |
-67:42:49.0 |
HIP 84969 |
11.94 |
| 2026-10-02 00:00 |
17:24:06.15 |
-67:41:47.3 |
HIP 84969 |
12.79 |
| 2026-10-02 12:00 |
17:24:12.06 |
-67:40:46.0 |
HIP 84969 |
13.70 |
| 2026-10-03 00:00 |
17:24:18.10 |
-67:39:44.9 |
HIP 84969 |
14.65 |
| 2026-10-03 12:00 |
17:24:24.26 |
-67:38:44.1 |
HIP 84969 |
15.64 |
| 2026-10-04 00:00 |
17:24:30.54 |
-67:37:43.5 |
HIP 84969 |
16.66 |
| 2026-10-04 12:00 |
17:24:36.95 |
-67:36:43.3 |
HIP 85272 |
15.90 |
| 2026-10-05 00:00 |
17:24:43.47 |
-67:35:43.3 |
HIP 85272 |
14.77 |
| 2026-10-05 12:00 |
17:24:50.12 |
-67:34:43.6 |
HIP 85272 |
13.64 |
| 2026-10-06 00:00 |
17:24:56.88 |
-67:33:44.2 |
HIP 85272 |
12.52 |
| 2026-10-06 12:00 |
17:25:03.76 |
-67:32:45.1 |
HIP 85272 |
11.42 |
| 2026-10-07 00:00 |
17:25:10.76 |
-67:31:46.3 |
HIP 85272 |
10.34 |
| 2026-10-07 12:00 |
17:25:17.88 |
-67:30:47.8 |
HIP 85272 |
9.30 |
| 2026-10-08 00:00 |
17:25:25.12 |
-67:29:49.6 |
HIP 85272 |
8.29 |
| 2026-10-08 12:00 |
17:25:32.47 |
-67:28:51.7 |
HIP 85272 |
7.35 |
| 2026-10-09 00:00 |
17:25:39.93 |
-67:27:54.1 |
HIP 85272 |
6.50 |
| 2026-10-09 12:00 |
17:25:47.51 |
-67:26:56.9 |
HIP 85272 |
5.78 |
| 2026-10-10 00:00 |
17:25:55.20 |
-67:26:00.0 |
HIP 85272 |
5.25 |
| 2026-10-10 12:00 |
17:26:03.00 |
-67:25:03.3 |
HIP 85339 |
4.63 |
| 2026-10-11 00:00 |
17:26:10.92 |
-67:24:06.9 |
HIP 85339 |
3.48 |