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) |
| 2026-03-26 00:00 |
19:25:31.64 |
-36:41:18.0 |
HIP 95337 |
31.63 |
| 2026-03-26 12:00 |
19:25:39.95 |
-36:42:27.6 |
HIP 95337 |
31.95 |
| 2026-03-27 00:00 |
19:25:48.01 |
-36:43:37.8 |
HIP 95337 |
32.36 |
| 2026-03-27 12:00 |
19:25:55.84 |
-36:44:48.9 |
HIP 95337 |
32.84 |
| 2026-03-28 00:00 |
19:26:03.42 |
-36:46:00.7 |
HIP 95743 |
31.43 |
| 2026-03-28 12:00 |
19:26:10.77 |
-36:47:13.3 |
HIP 95743 |
29.59 |
| 2026-03-29 00:00 |
19:26:17.87 |
-36:48:26.7 |
HIP 95743 |
27.80 |
| 2026-03-29 12:00 |
19:26:24.73 |
-36:49:40.8 |
HIP 95743 |
26.06 |
| 2026-03-30 00:00 |
19:26:31.34 |
-36:50:55.7 |
HIP 95743 |
24.37 |
| 2026-03-30 12:00 |
19:26:37.71 |
-36:52:11.3 |
HIP 95743 |
22.75 |
| 2026-03-31 00:00 |
19:26:43.83 |
-36:53:27.8 |
HIP 95743 |
21.20 |
| 2026-03-31 12:00 |
19:26:49.70 |
-36:54:44.9 |
HIP 95743 |
19.74 |
| 2026-04-01 00:00 |
19:26:55.33 |
-36:56:02.9 |
HIP 95743 |
18.37 |
| 2026-04-01 12:00 |
19:27:00.70 |
-36:57:21.6 |
HIP 95743 |
17.11 |
| 2026-04-02 00:00 |
19:27:05.82 |
-36:58:41.1 |
HIP 95743 |
15.98 |
| 2026-04-02 12:00 |
19:27:10.68 |
-37:00:01.3 |
HIP 95743 |
15.01 |
| 2026-04-03 00:00 |
19:27:15.30 |
-37:01:22.3 |
HIP 95743 |
14.22 |
| 2026-04-03 12:00 |
19:27:19.65 |
-37:02:44.0 |
HIP 95743 |
13.63 |
| 2026-04-04 00:00 |
19:27:23.75 |
-37:04:06.5 |
HIP 95743 |
13.27 |
| 2026-04-04 12:00 |
19:27:27.59 |
-37:05:29.7 |
HIP 95743 |
13.15 |
| 2026-04-05 00:00 |
19:27:31.17 |
-37:06:53.7 |
HIP 95743 |
13.26 |
| 2026-04-05 12:00 |
19:27:34.48 |
-37:08:18.5 |
HIP 95743 |
13.61 |
| 2026-04-06 00:00 |
19:27:37.54 |
-37:09:44.0 |
HIP 95743 |
14.17 |
| 2026-04-06 12:00 |
19:27:40.33 |
-37:11:10.2 |
HIP 95743 |
14.91 |
| 2026-04-07 00:00 |
19:27:42.85 |
-37:12:37.2 |
HIP 95743 |
15.80 |
| 2026-04-07 12:00 |
19:27:45.11 |
-37:14:04.9 |
HIP 95743 |
16.83 |
| 2026-04-08 00:00 |
19:27:47.10 |
-37:15:33.3 |
HIP 95743 |
17.96 |
| 2026-04-08 12:00 |
19:27:48.81 |
-37:17:02.5 |
HIP 95743 |
19.18 |
| 2026-04-09 00:00 |
19:27:50.26 |
-37:18:32.4 |
HIP 95743 |
20.47 |
| 2026-04-09 12:00 |
19:27:51.44 |
-37:20:03.1 |
HIP 95743 |
21.82 |
| 2026-04-10 00:00 |
19:27:52.34 |
-37:21:34.4 |
HIP 95743 |
23.21 |
| 2026-04-10 12:00 |
19:27:52.96 |
-37:23:06.5 |
HIP 95743 |
24.65 |
| 2026-04-11 00:00 |
19:27:53.31 |
-37:24:39.2 |
HIP 95743 |
26.13 |
| 2026-04-11 12:00 |
19:27:53.38 |
-37:26:12.7 |
HIP 95858 |
26.55 |
| 2026-04-12 00:00 |
19:27:53.17 |
-37:27:46.9 |
HIP 95858 |
25.81 |
| 2026-04-12 12:00 |
19:27:52.68 |
-37:29:21.8 |
HIP 95858 |
25.18 |
| 2026-04-13 00:00 |
19:27:51.91 |
-37:30:57.4 |
HIP 95858 |
24.70 |
| 2026-04-13 12:00 |
19:27:50.85 |
-37:32:33.6 |
HIP 95858 |
24.35 |
| 2026-04-14 00:00 |
19:27:49.51 |
-37:34:10.5 |
HIP 95858 |
24.17 |
| 2026-04-14 12:00 |
19:27:47.89 |
-37:35:48.1 |
HIP 95858 |
24.14 |
| 2026-04-15 00:00 |
19:27:45.97 |
-37:37:26.4 |
HIP 95858 |
24.29 |
| 2026-04-15 12:00 |
19:27:43.77 |
-37:39:05.3 |
HIP 95858 |
24.61 |
| 2026-04-16 00:00 |
19:27:41.28 |
-37:40:44.9 |
HIP 95858 |
25.09 |