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) |
| 2026-06-01 00:00 |
18:10:46.45 |
-70:33:55.0 |
HIP 89162 |
15.65 |
| 2026-06-01 12:00 |
18:10:26.01 |
-70:34:25.4 |
HIP 89162 |
16.75 |
| 2026-06-02 00:00 |
18:10:05.49 |
-70:34:55.1 |
HIP 89162 |
17.95 |
| 2026-06-02 12:00 |
18:09:44.90 |
-70:35:23.9 |
HIP 89162 |
19.23 |
| 2026-06-03 00:00 |
18:09:24.24 |
-70:35:52.0 |
HIP 89162 |
20.58 |
| 2026-06-03 12:00 |
18:09:03.51 |
-70:36:19.3 |
HIP 89162 |
21.99 |
| 2026-06-04 00:00 |
18:08:42.71 |
-70:36:45.8 |
HIP 89162 |
23.44 |
| 2026-06-04 12:00 |
18:08:21.84 |
-70:37:11.5 |
HIP 89162 |
24.93 |
| 2026-06-05 00:00 |
18:08:00.91 |
-70:37:36.3 |
HIP 89162 |
26.45 |
| 2026-06-05 12:00 |
18:07:39.92 |
-70:38:00.4 |
HIP 88621 |
26.33 |
| 2026-06-06 00:00 |
18:07:18.88 |
-70:38:23.7 |
HIP 88621 |
26.06 |
| 2026-06-06 12:00 |
18:06:57.77 |
-70:38:46.2 |
HIP 88621 |
25.89 |
| 2026-06-07 00:00 |
18:06:36.61 |
-70:39:07.8 |
HIP 88621 |
25.84 |
| 2026-06-07 12:00 |
18:06:15.40 |
-70:39:28.7 |
HIP 88621 |
25.90 |
| 2026-06-08 00:00 |
18:05:54.14 |
-70:39:48.7 |
HIP 88489 |
25.38 |
| 2026-06-08 12:00 |
18:05:32.84 |
-70:40:07.9 |
HIP 88489 |
24.52 |
| 2026-06-09 00:00 |
18:05:11.49 |
-70:40:26.3 |
HIP 88489 |
23.78 |
| 2026-06-09 12:00 |
18:04:50.09 |
-70:40:43.8 |
HIP 88489 |
23.16 |
| 2026-06-10 00:00 |
18:04:28.66 |
-70:41:00.6 |
HIP 88489 |
22.68 |
| 2026-06-10 12:00 |
18:04:07.19 |
-70:41:16.5 |
HIP 88489 |
22.34 |
| 2026-06-11 00:00 |
18:03:45.68 |
-70:41:31.5 |
HIP 88489 |
22.16 |
| 2026-06-11 12:00 |
18:03:24.14 |
-70:41:45.8 |
HIP 88489 |
22.13 |
| 2026-06-12 00:00 |
18:03:02.57 |
-70:41:59.2 |
HIP 88489 |
22.26 |
| 2026-06-12 12:00 |
18:02:40.97 |
-70:42:11.8 |
HIP 88489 |
22.55 |
| 2026-06-13 00:00 |
18:02:19.35 |
-70:42:23.5 |
HIP 88489 |
22.98 |
| 2026-06-13 12:00 |
18:01:57.70 |
-70:42:34.4 |
HIP 88489 |
23.55 |
| 2026-06-14 00:00 |
18:01:36.04 |
-70:42:44.5 |
HIP 88173 |
24.19 |
| 2026-06-14 12:00 |
18:01:14.35 |
-70:42:53.7 |
HIP 88173 |
23.99 |
| 2026-06-15 00:00 |
18:00:52.65 |
-70:43:02.1 |
HIP 88173 |
23.91 |
| 2026-06-15 12:00 |
18:00:30.94 |
-70:43:09.7 |
HIP 88173 |
23.95 |
| 2026-06-16 00:00 |
18:00:09.22 |
-70:43:16.4 |
HIP 87784 |
24.08 |
| 2026-06-16 12:00 |
17:59:47.49 |
-70:43:22.3 |
HIP 87784 |
22.57 |
| 2026-06-17 00:00 |
17:59:25.76 |
-70:43:27.3 |
HIP 87784 |
21.10 |
| 2026-06-17 12:00 |
17:59:04.02 |
-70:43:31.5 |
HIP 87784 |
19.68 |
| 2026-06-18 00:00 |
17:58:42.29 |
-70:43:34.8 |
HIP 87784 |
18.31 |
| 2026-06-18 12:00 |
17:58:20.56 |
-70:43:37.4 |
HIP 87784 |
17.02 |
| 2026-06-19 00:00 |
17:57:58.83 |
-70:43:39.0 |
HIP 87784 |
15.81 |
| 2026-06-19 12:00 |
17:57:37.12 |
-70:43:39.9 |
HIP 87778 |
14.70 |
| 2026-06-20 00:00 |
17:57:15.41 |
-70:43:39.9 |
HIP 87778 |
13.70 |
| 2026-06-20 12:00 |
17:56:53.72 |
-70:43:39.1 |
HIP 87778 |
12.87 |
| 2026-06-21 00:00 |
17:56:32.04 |
-70:43:37.4 |
HIP 87778 |
12.23 |
| 2026-06-21 12:00 |
17:56:10.38 |
-70:43:34.9 |
HIP 87778 |
11.82 |
| 2026-06-22 00:00 |
17:55:48.74 |
-70:43:31.6 |
HIP 87778 |
11.66 |