P/2008 Y12 (SOHO)
メタデータ
| 項目 |
値 |
| Designation |
P/2008 Y12 (SOHO) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-12-22T11:21:24.419520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:27Z |
| Obs used |
76 |
| NEO |
Yes |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-10-24.0000000 |
| e |
0.97876170 |
| q (au) |
0.065376 |
| a (au) |
3.078198 |
| i (deg) |
23.345371 |
| Ω (om, deg) |
312.574737 |
| ω (w, deg) |
146.622073 |
| M (ma, deg) |
122.370129 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-02-03 00:00 |
18:54:27.03 |
-35:42:30.8 |
HIP 92839 |
6.02 |
| 2026-02-03 12:00 |
18:54:53.06 |
-35:42:38.0 |
HIP 92839 |
1.52 |
| 2026-02-04 00:00 |
18:55:18.97 |
-35:42:45.7 |
HIP 92839 |
4.90 |
| 2026-02-04 12:00 |
18:55:44.77 |
-35:42:53.7 |
HIP 92839 |
10.03 |
| 2026-02-05 00:00 |
18:56:10.44 |
-35:43:02.1 |
HIP 92839 |
15.20 |
| 2026-02-05 12:00 |
18:56:36.00 |
-35:43:10.9 |
HIP 93109 |
18.08 |
| 2026-02-06 00:00 |
18:57:01.43 |
-35:43:20.2 |
HIP 93109 |
12.93 |
| 2026-02-06 12:00 |
18:57:26.75 |
-35:43:29.8 |
HIP 93109 |
7.81 |
| 2026-02-07 00:00 |
18:57:51.94 |
-35:43:39.8 |
HIP 93109 |
2.80 |
| 2026-02-07 12:00 |
18:58:17.01 |
-35:43:50.3 |
HIP 93109 |
2.62 |
| 2026-02-08 00:00 |
18:58:41.95 |
-35:44:01.2 |
HIP 93109 |
7.57 |
| 2026-02-08 12:00 |
18:59:06.77 |
-35:44:12.5 |
HIP 93227 |
11.16 |
| 2026-02-09 00:00 |
18:59:31.46 |
-35:44:24.3 |
HIP 93227 |
10.47 |
| 2026-02-09 12:00 |
18:59:56.02 |
-35:44:36.5 |
HIP 93227 |
12.02 |
| 2026-02-10 00:00 |
19:00:20.45 |
-35:44:49.1 |
HIP 93227 |
15.10 |
| 2026-02-10 12:00 |
19:00:44.75 |
-35:45:02.2 |
HIP 93384 |
14.23 |
| 2026-02-11 00:00 |
19:01:08.93 |
-35:45:15.8 |
HIP 93384 |
12.89 |
| 2026-02-11 12:00 |
19:01:32.97 |
-35:45:29.8 |
HIP 93384 |
13.32 |
| 2026-02-12 00:00 |
19:01:56.87 |
-35:45:44.3 |
HIP 93384 |
15.35 |
| 2026-02-12 12:00 |
19:02:20.65 |
-35:45:59.2 |
HIP 93384 |
18.44 |
| 2026-02-13 00:00 |
19:02:44.28 |
-35:46:14.6 |
HIP 93515 |
19.55 |
| 2026-02-13 12:00 |
19:03:07.78 |
-35:46:30.5 |
HIP 93515 |
19.94 |
| 2026-02-14 00:00 |
19:03:31.14 |
-35:46:46.9 |
HIP 93515 |
21.39 |
| 2026-02-14 12:00 |
19:03:54.37 |
-35:47:03.8 |
HIP 93622 |
20.61 |
| 2026-02-15 00:00 |
19:04:17.45 |
-35:47:21.1 |
HIP 93668 |
19.73 |
| 2026-02-15 12:00 |
19:04:40.39 |
-35:47:39.0 |
HIP 93668 |
19.56 |
| 2026-02-16 00:00 |
19:05:03.19 |
-35:47:57.4 |
HIP 93668 |
20.47 |
| 2026-02-16 12:00 |
19:05:25.84 |
-35:48:16.2 |
HIP 93668 |
22.29 |
| 2026-02-17 00:00 |
19:05:48.35 |
-35:48:35.6 |
HIP 93882 |
20.31 |
| 2026-02-17 12:00 |
19:06:10.71 |
-35:48:55.5 |
HIP 93882 |
17.18 |
| 2026-02-18 00:00 |
19:06:32.93 |
-35:49:16.0 |
HIP 93882 |
14.84 |
| 2026-02-18 12:00 |
19:06:54.99 |
-35:49:36.9 |
HIP 93944 |
12.21 |
| 2026-02-19 00:00 |
19:07:16.91 |
-35:49:58.4 |
HIP 93944 |
8.92 |
| 2026-02-19 12:00 |
19:07:38.67 |
-35:50:20.5 |
HIP 93944 |
7.05 |
| 2026-02-20 00:00 |
19:08:00.29 |
-35:50:43.0 |
HIP 93944 |
7.65 |
| 2026-02-20 12:00 |
19:08:21.75 |
-35:51:06.2 |
HIP 93944 |
10.27 |
| 2026-02-21 00:00 |
19:08:43.05 |
-35:51:29.8 |
HIP 93944 |
13.77 |
| 2026-02-21 12:00 |
19:09:04.20 |
-35:51:54.1 |
HIP 93944 |
17.60 |
| 2026-02-22 00:00 |
19:09:25.19 |
-35:52:18.9 |
HIP 94124 |
17.72 |
| 2026-02-22 12:00 |
19:09:46.03 |
-35:52:44.2 |
HIP 94124 |
17.26 |
| 2026-02-23 00:00 |
19:10:06.70 |
-35:53:10.2 |
HIP 94124 |
17.81 |
| 2026-02-23 12:00 |
19:10:27.22 |
-35:53:36.7 |
HIP 94124 |
19.25 |
| 2026-02-24 00:00 |
19:10:47.57 |
-35:54:03.8 |
HIP 94356 |
18.72 |