メタデータ
| 項目 |
値 |
| Designation |
C/2023 A2 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-01-20T09:20:12.062400Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T09:30:38Z |
| Obs used |
159 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
20.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-01-06T00:00:00Z |
| Discovery magnitude (MPC) |
- |
| 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) |
2023-03-06.0000000 |
| e |
0.99829132 |
| q (au) |
0.947460 |
| a (au) |
554.499318 |
| i (deg) |
94.708355 |
| Ω (om, deg) |
94.471088 |
| ω (w, deg) |
142.583308 |
| M (ma, deg) |
0.003367 |
等級
散乱 + 全体線形
$$
M_a = (14.827 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.827 |
| n |
6.000 |
| gf |
0.991 |
| gb |
-1.000 |
| k |
0.840 |
| 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) |
| 2026-09-20 00:00 |
06:59:44.57 |
-44:55:27.8 |
HIP 33636 |
19.00 |
| 2026-09-20 12:00 |
06:59:47.56 |
-44:57:19.6 |
HIP 33636 |
17.39 |
| 2026-09-21 00:00 |
06:59:50.45 |
-44:59:11.6 |
HIP 33636 |
15.83 |
| 2026-09-21 12:00 |
06:59:53.23 |
-45:01:03.8 |
HIP 33636 |
14.36 |
| 2026-09-22 00:00 |
06:59:55.91 |
-45:02:56.3 |
HIP 33636 |
13.00 |
| 2026-09-22 12:00 |
06:59:58.48 |
-45:04:49.0 |
HIP 33636 |
11.78 |
| 2026-09-23 00:00 |
07:00:00.95 |
-45:06:41.9 |
HIP 33636 |
10.76 |
| 2026-09-23 12:00 |
07:00:03.31 |
-45:08:35.1 |
HIP 33636 |
9.99 |
| 2026-09-24 00:00 |
07:00:05.56 |
-45:10:28.4 |
HIP 33636 |
9.53 |
| 2026-09-24 12:00 |
07:00:07.71 |
-45:12:22.0 |
HIP 33636 |
9.44 |
| 2026-09-25 00:00 |
07:00:09.74 |
-45:14:15.7 |
HIP 33636 |
9.71 |
| 2026-09-25 12:00 |
07:00:11.67 |
-45:16:09.6 |
HIP 33636 |
10.33 |
| 2026-09-26 00:00 |
07:00:13.49 |
-45:18:03.7 |
HIP 33636 |
11.23 |
| 2026-09-26 12:00 |
07:00:15.21 |
-45:19:58.0 |
HIP 33636 |
12.35 |
| 2026-09-27 00:00 |
07:00:16.81 |
-45:21:52.4 |
HIP 33636 |
13.64 |
| 2026-09-27 12:00 |
07:00:18.31 |
-45:23:46.9 |
HIP 33636 |
15.05 |
| 2026-09-28 00:00 |
07:00:19.69 |
-45:25:41.6 |
HIP 33636 |
16.56 |
| 2026-09-28 12:00 |
07:00:20.97 |
-45:27:36.5 |
HIP 33636 |
18.13 |
| 2026-09-29 00:00 |
07:00:22.13 |
-45:29:31.4 |
HIP 33636 |
19.76 |
| 2026-09-29 12:00 |
07:00:23.18 |
-45:31:26.5 |
HIP 33636 |
21.43 |
| 2026-09-30 00:00 |
07:00:24.13 |
-45:33:21.7 |
HIP 33871 |
21.18 |
| 2026-09-30 12:00 |
07:00:24.96 |
-45:35:17.0 |
HIP 33871 |
19.78 |
| 2026-10-01 00:00 |
07:00:25.67 |
-45:37:12.3 |
HIP 33871 |
18.49 |
| 2026-10-01 12:00 |
07:00:26.28 |
-45:39:07.8 |
HIP 33871 |
17.34 |
| 2026-10-02 00:00 |
07:00:26.77 |
-45:41:03.3 |
HIP 33871 |
16.34 |
| 2026-10-02 12:00 |
07:00:27.15 |
-45:42:58.9 |
HIP 33871 |
15.55 |
| 2026-10-03 00:00 |
07:00:27.42 |
-45:44:54.5 |
HIP 33871 |
14.98 |
| 2026-10-03 12:00 |
07:00:27.57 |
-45:46:50.2 |
HIP 33871 |
14.66 |
| 2026-10-04 00:00 |
07:00:27.61 |
-45:48:45.9 |
HIP 33871 |
14.61 |
| 2026-10-04 12:00 |
07:00:27.54 |
-45:50:41.7 |
HIP 33871 |
14.84 |
| 2026-10-05 00:00 |
07:00:27.34 |
-45:52:37.5 |
HIP 33871 |
15.32 |
| 2026-10-05 12:00 |
07:00:27.04 |
-45:54:33.2 |
HIP 33871 |
16.05 |
| 2026-10-06 00:00 |
07:00:26.61 |
-45:56:29.0 |
HIP 33871 |
16.98 |
| 2026-10-06 12:00 |
07:00:26.08 |
-45:58:24.8 |
HIP 33871 |
18.08 |
| 2026-10-07 00:00 |
07:00:25.42 |
-46:00:20.5 |
HIP 33619 |
17.86 |
| 2026-10-07 12:00 |
07:00:24.65 |
-46:02:16.2 |
HIP 33619 |
16.60 |
| 2026-10-08 00:00 |
07:00:23.76 |
-46:04:11.9 |
HIP 33619 |
15.45 |
| 2026-10-08 12:00 |
07:00:22.75 |
-46:06:07.5 |
HIP 33619 |
14.46 |
| 2026-10-09 00:00 |
07:00:21.63 |
-46:08:03.0 |
HIP 33619 |
13.66 |
| 2026-10-09 12:00 |
07:00:20.39 |
-46:09:58.5 |
HIP 33619 |
13.07 |
| 2026-10-10 00:00 |
07:00:19.03 |
-46:11:53.9 |
HIP 33619 |
12.73 |
| 2026-10-10 12:00 |
07:00:17.55 |
-46:13:49.2 |
HIP 33619 |
12.66 |
| 2026-10-11 00:00 |
07:00:15.95 |
-46:15:44.4 |
HIP 33619 |
12.87 |