P/2013 YG46 (Spacewatch)
メタデータ
| 項目 |
値 |
| Designation |
P/2013 YG46 (Spacewatch) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-01-19T12:53:16.437120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:44Z |
| Obs used |
55 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-01-29.0000000 |
| e |
0.45164645 |
| q (au) |
1.815243 |
| a (au) |
3.310351 |
| i (deg) |
8.219141 |
| Ω (om, deg) |
56.868085 |
| ω (w, deg) |
232.796581 |
| M (ma, deg) |
182.197613 |
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 |
07:24:16.72 |
+30:30:40.9 |
HIP 35931 |
10.45 |
| 2026-02-03 12:00 |
07:23:55.94 |
+30:30:58.7 |
HIP 35931 |
11.81 |
| 2026-02-04 00:00 |
07:23:35.33 |
+30:31:15.5 |
HIP 35931 |
14.47 |
| 2026-02-04 12:00 |
07:23:14.88 |
+30:31:31.3 |
HIP 35931 |
17.84 |
| 2026-02-05 00:00 |
07:22:54.60 |
+30:31:46.0 |
HIP 35721 |
17.77 |
| 2026-02-05 12:00 |
07:22:34.49 |
+30:31:59.8 |
HIP 35721 |
16.08 |
| 2026-02-06 00:00 |
07:22:14.56 |
+30:32:12.6 |
HIP 35721 |
15.45 |
| 2026-02-06 12:00 |
07:21:54.80 |
+30:32:24.4 |
HIP 35721 |
15.97 |
| 2026-02-07 00:00 |
07:21:35.22 |
+30:32:35.3 |
HIP 35721 |
17.51 |
| 2026-02-07 12:00 |
07:21:15.83 |
+30:32:45.1 |
HIP 35721 |
19.81 |
| 2026-02-08 00:00 |
07:20:56.62 |
+30:32:54.0 |
HIP 35582 |
18.56 |
| 2026-02-08 12:00 |
07:20:37.60 |
+30:33:01.9 |
HIP 35582 |
18.11 |
| 2026-02-09 00:00 |
07:20:18.77 |
+30:33:08.9 |
HIP 35582 |
18.55 |
| 2026-02-09 12:00 |
07:20:00.13 |
+30:33:14.9 |
HIP 35582 |
19.81 |
| 2026-02-10 00:00 |
07:19:41.70 |
+30:33:19.9 |
HIP 35582 |
21.71 |
| 2026-02-10 12:00 |
07:19:23.46 |
+30:33:24.1 |
HIP 35372 |
20.23 |
| 2026-02-11 00:00 |
07:19:05.43 |
+30:33:27.2 |
HIP 35372 |
18.09 |
| 2026-02-11 12:00 |
07:18:47.60 |
+30:33:29.5 |
HIP 35372 |
16.62 |
| 2026-02-12 00:00 |
07:18:29.97 |
+30:33:30.8 |
HIP 35372 |
15.97 |
| 2026-02-12 12:00 |
07:18:12.56 |
+30:33:31.3 |
HIP 35372 |
16.21 |
| 2026-02-13 00:00 |
07:17:55.37 |
+30:33:30.8 |
HIP 35372 |
17.28 |
| 2026-02-13 12:00 |
07:17:38.38 |
+30:33:29.4 |
HIP 35193 |
18.38 |
| 2026-02-14 00:00 |
07:17:21.62 |
+30:33:27.1 |
HIP 35193 |
15.34 |
| 2026-02-14 12:00 |
07:17:05.07 |
+30:33:23.9 |
HIP 35193 |
12.64 |
| 2026-02-15 00:00 |
07:16:48.75 |
+30:33:19.9 |
HIP 35193 |
10.51 |
| 2026-02-15 12:00 |
07:16:32.65 |
+30:33:15.0 |
HIP 35193 |
9.28 |
| 2026-02-16 00:00 |
07:16:16.78 |
+30:33:09.2 |
HIP 35193 |
9.27 |
| 2026-02-16 12:00 |
07:16:01.14 |
+30:33:02.5 |
HIP 35193 |
10.44 |
| 2026-02-17 00:00 |
07:15:45.73 |
+30:32:55.0 |
HIP 35193 |
12.41 |
| 2026-02-17 12:00 |
07:15:30.55 |
+30:32:46.7 |
HIP 35193 |
14.85 |
| 2026-02-18 00:00 |
07:15:15.60 |
+30:32:37.5 |
HIP 35193 |
17.52 |
| 2026-02-18 12:00 |
07:15:00.89 |
+30:32:27.5 |
HIP 35193 |
20.31 |
| 2026-02-19 00:00 |
07:14:46.43 |
+30:32:16.7 |
HIP 35193 |
23.16 |
| 2026-02-19 12:00 |
07:14:32.20 |
+30:32:05.1 |
HIP 35193 |
26.03 |
| 2026-02-20 00:00 |
07:14:18.21 |
+30:31:52.7 |
HIP 35193 |
28.89 |
| 2026-02-20 12:00 |
07:14:04.46 |
+30:31:39.5 |
HIP 35193 |
31.74 |
| 2026-02-21 00:00 |
07:13:50.96 |
+30:31:25.5 |
HIP 34740 |
30.71 |
| 2026-02-21 12:00 |
07:13:37.71 |
+30:31:10.7 |
HIP 34740 |
27.87 |
| 2026-02-22 00:00 |
07:13:24.71 |
+30:30:55.2 |
HIP 34733 |
25.06 |
| 2026-02-22 12:00 |
07:13:11.95 |
+30:30:38.9 |
HIP 34733 |
22.30 |
| 2026-02-23 00:00 |
07:12:59.44 |
+30:30:21.8 |
HIP 34733 |
19.59 |
| 2026-02-23 12:00 |
07:12:47.18 |
+30:30:04.1 |
HIP 34733 |
16.94 |
| 2026-02-24 00:00 |
07:12:35.18 |
+30:29:45.6 |
HIP 34733 |
14.33 |