323P/SOHO
メタデータ
| 項目 |
値 |
| Designation |
323P/SOHO |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-01-17T15:09:04.803840Z |
| Orbit solution date (soln_date, UTC) |
2025-02-20T14:38:09Z |
| Obs used |
171 |
| NEO |
Yes |
| M1 |
23.400 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-03-03.0000000 |
| e |
0.98481410 |
| q (au) |
0.039207 |
| a (au) |
2.581828 |
| i (deg) |
5.369972 |
| Ω (om, deg) |
324.229171 |
| ω (w, deg) |
353.174495 |
| M (ma, deg) |
10.541190 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2025-01-27 |
2025-02-08 |
-17.3579 |
+3.208 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
08:57:44.70 |
+18:45:21.6 |
HIP 44090 |
20.76 |
| 2026-02-03 12:00 |
08:57:07.30 |
+18:47:49.6 |
HIP 44090 |
26.83 |
| 2026-02-04 00:00 |
08:56:29.98 |
+18:50:16.7 |
HIP 44022 |
33.50 |
| 2026-02-04 12:00 |
08:55:52.74 |
+18:52:42.7 |
HIP 44022 |
37.81 |
| 2026-02-05 00:00 |
08:55:15.58 |
+18:55:07.8 |
HIP 43642 |
36.37 |
| 2026-02-05 12:00 |
08:54:38.52 |
+18:57:31.8 |
HIP 43642 |
28.53 |
| 2026-02-06 00:00 |
08:54:01.55 |
+18:59:54.8 |
HIP 43642 |
21.69 |
| 2026-02-06 12:00 |
08:53:24.69 |
+19:02:16.7 |
HIP 43642 |
17.08 |
| 2026-02-07 00:00 |
08:52:47.93 |
+19:04:37.6 |
HIP 43540 |
15.17 |
| 2026-02-07 12:00 |
08:52:11.29 |
+19:06:57.3 |
HIP 43540 |
13.42 |
| 2026-02-08 00:00 |
08:51:34.78 |
+19:09:15.9 |
HIP 43564 |
15.90 |
| 2026-02-08 12:00 |
08:50:58.38 |
+19:11:33.4 |
HIP 43564 |
21.48 |
| 2026-02-09 00:00 |
08:50:22.13 |
+19:13:49.7 |
HIP 43427 |
24.51 |
| 2026-02-09 12:00 |
08:49:46.01 |
+19:16:04.9 |
HIP 43427 |
29.65 |
| 2026-02-10 00:00 |
08:49:10.03 |
+19:18:18.9 |
HIP 43223 |
35.62 |
| 2026-02-10 12:00 |
08:48:34.20 |
+19:20:31.7 |
HIP 43223 |
35.83 |
| 2026-02-11 00:00 |
08:47:58.53 |
+19:22:43.3 |
HIP 43050 |
31.35 |
| 2026-02-11 12:00 |
08:47:23.02 |
+19:24:53.6 |
HIP 43050 |
23.77 |
| 2026-02-12 00:00 |
08:46:47.67 |
+19:27:02.7 |
HIP 43050 |
17.26 |
| 2026-02-12 12:00 |
08:46:12.49 |
+19:29:10.6 |
HIP 43050 |
13.39 |
| 2026-02-13 00:00 |
08:45:37.49 |
+19:31:17.2 |
HIP 43050 |
14.39 |
| 2026-02-13 12:00 |
08:45:02.67 |
+19:33:22.5 |
HIP 43050 |
19.45 |
| 2026-02-14 00:00 |
08:44:28.04 |
+19:35:26.6 |
HIP 43050 |
26.28 |
| 2026-02-14 12:00 |
08:43:53.60 |
+19:37:29.3 |
HIP 42673 |
32.68 |
| 2026-02-15 00:00 |
08:43:19.36 |
+19:39:30.8 |
HIP 42673 |
24.67 |
| 2026-02-15 12:00 |
08:42:45.31 |
+19:41:30.9 |
HIP 42673 |
16.98 |
| 2026-02-16 00:00 |
08:42:11.48 |
+19:43:29.7 |
HIP 42673 |
10.27 |
| 2026-02-16 12:00 |
08:41:37.85 |
+19:45:27.2 |
HIP 42673 |
7.57 |
| 2026-02-17 00:00 |
08:41:04.44 |
+19:47:23.3 |
HIP 42578 |
6.54 |
| 2026-02-17 12:00 |
08:40:31.25 |
+19:49:18.1 |
HIP 42578 |
6.76 |
| 2026-02-18 00:00 |
08:39:58.29 |
+19:51:11.5 |
HIP 42485 |
5.79 |
| 2026-02-18 12:00 |
08:39:25.55 |
+19:53:03.6 |
HIP 42485 |
7.52 |
| 2026-02-19 00:00 |
08:38:53.05 |
+19:54:54.3 |
HIP 42485 |
14.26 |
| 2026-02-19 12:00 |
08:38:20.79 |
+19:56:43.6 |
HIP 42485 |
21.70 |
| 2026-02-20 00:00 |
08:37:48.77 |
+19:58:31.5 |
HIP 42319 |
27.48 |
| 2026-02-20 12:00 |
08:37:16.99 |
+20:00:18.1 |
HIP 42201 |
24.55 |
| 2026-02-21 00:00 |
08:36:45.47 |
+20:02:03.3 |
HIP 42201 |
19.57 |
| 2026-02-21 12:00 |
08:36:14.19 |
+20:03:47.1 |
HIP 42201 |
16.73 |
| 2026-02-22 00:00 |
08:35:43.18 |
+20:05:29.5 |
HIP 42201 |
17.02 |
| 2026-02-22 12:00 |
08:35:12.43 |
+20:07:10.5 |
HIP 42201 |
20.25 |
| 2026-02-23 00:00 |
08:34:41.94 |
+20:08:50.1 |
HIP 41978 |
23.55 |
| 2026-02-23 12:00 |
08:34:11.71 |
+20:10:28.3 |
HIP 41978 |
17.25 |
| 2026-02-24 00:00 |
08:33:41.76 |
+20:12:05.1 |
HIP 41978 |
12.14 |