125P/Spacewatch
メタデータ
| 項目 |
値 |
| Designation |
125P/Spacewatch |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-02-17T02:03:36.748800Z |
| Orbit solution date (soln_date, UTC) |
2024-10-29T14:53:15Z |
| Obs used |
1297 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
16.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-08-11.0000000 |
| e |
0.51269168 |
| q (au) |
1.523187 |
| a (au) |
3.125715 |
| i (deg) |
9.988031 |
| Ω (om, deg) |
153.195189 |
| ω (w, deg) |
87.145345 |
| M (ma, deg) |
161.393997 |
等級
散乱 + 全体線形
$$
M_a = (12.400 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.400 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.850 |
| k |
0.999 |
| 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) |
| 2026-02-03 00:00 |
01:47:06.02 |
+01:47:52.7 |
HIP 8454 |
39.99 |
| 2026-02-03 12:00 |
01:47:21.25 |
+01:50:04.7 |
HIP 8454 |
39.04 |
| 2026-02-04 00:00 |
01:47:36.64 |
+01:52:17.1 |
HIP 8454 |
38.56 |
| 2026-02-04 12:00 |
01:47:52.16 |
+01:54:30.1 |
HIP 8454 |
38.57 |
| 2026-02-05 00:00 |
01:48:07.83 |
+01:56:43.5 |
HIP 8454 |
39.10 |
| 2026-02-05 12:00 |
01:48:23.64 |
+01:58:57.4 |
HIP 8454 |
40.13 |
| 2026-02-06 00:00 |
01:48:39.59 |
+02:01:11.8 |
HIP 8454 |
41.63 |
| 2026-02-06 12:00 |
01:48:55.68 |
+02:03:26.6 |
HIP 8392 |
40.55 |
| 2026-02-07 00:00 |
01:49:11.92 |
+02:05:41.8 |
HIP 8657 |
39.65 |
| 2026-02-07 12:00 |
01:49:28.28 |
+02:07:57.5 |
HIP 8657 |
34.98 |
| 2026-02-08 00:00 |
01:49:44.79 |
+02:10:13.6 |
HIP 8657 |
30.28 |
| 2026-02-08 12:00 |
01:50:01.43 |
+02:12:30.1 |
HIP 8657 |
25.55 |
| 2026-02-09 00:00 |
01:50:18.21 |
+02:14:47.1 |
HIP 8657 |
20.79 |
| 2026-02-09 12:00 |
01:50:35.12 |
+02:17:04.4 |
HIP 8657 |
16.01 |
| 2026-02-10 00:00 |
01:50:52.17 |
+02:19:22.1 |
HIP 8657 |
11.21 |
| 2026-02-10 12:00 |
01:51:09.35 |
+02:21:40.2 |
HIP 8657 |
6.43 |
| 2026-02-11 00:00 |
01:51:26.66 |
+02:23:58.7 |
HIP 8657 |
2.09 |
| 2026-02-11 12:00 |
01:51:44.09 |
+02:26:17.6 |
HIP 8657 |
3.96 |
| 2026-02-12 00:00 |
01:52:01.66 |
+02:28:36.8 |
HIP 8657 |
8.72 |
| 2026-02-12 12:00 |
01:52:19.36 |
+02:30:56.3 |
HIP 8757 |
4.85 |
| 2026-02-13 00:00 |
01:52:37.19 |
+02:33:16.3 |
HIP 8757 |
3.38 |
| 2026-02-13 12:00 |
01:52:55.14 |
+02:35:36.5 |
HIP 8757 |
7.09 |
| 2026-02-14 00:00 |
01:53:13.21 |
+02:37:57.1 |
HIP 8757 |
11.87 |
| 2026-02-14 12:00 |
01:53:31.42 |
+02:40:18.0 |
HIP 8757 |
16.85 |
| 2026-02-15 00:00 |
01:53:49.74 |
+02:42:39.2 |
HIP 8757 |
21.93 |
| 2026-02-15 12:00 |
01:54:08.19 |
+02:45:00.8 |
HIP 8958 |
22.22 |
| 2026-02-16 00:00 |
01:54:26.76 |
+02:47:22.6 |
HIP 8958 |
17.06 |
| 2026-02-16 12:00 |
01:54:45.45 |
+02:49:44.7 |
HIP 8958 |
11.92 |
| 2026-02-17 00:00 |
01:55:04.26 |
+02:52:07.1 |
HIP 8958 |
6.90 |
| 2026-02-17 12:00 |
01:55:23.18 |
+02:54:29.8 |
HIP 8958 |
2.93 |
| 2026-02-18 00:00 |
01:55:42.23 |
+02:56:52.7 |
HIP 8972 |
4.04 |
| 2026-02-18 12:00 |
01:56:01.39 |
+02:59:15.9 |
HIP 8972 |
8.64 |
| 2026-02-19 00:00 |
01:56:20.67 |
+03:01:39.3 |
HIP 8972 |
13.82 |
| 2026-02-19 12:00 |
01:56:40.06 |
+03:04:03.0 |
HIP 8972 |
19.13 |
| 2026-02-20 00:00 |
01:56:59.56 |
+03:06:26.9 |
HIP 8972 |
24.50 |
| 2026-02-20 12:00 |
01:57:19.18 |
+03:08:51.0 |
HIP 8972 |
29.92 |
| 2026-02-21 00:00 |
01:57:38.91 |
+03:11:15.4 |
HIP 9275 |
30.63 |
| 2026-02-21 12:00 |
01:57:58.75 |
+03:13:39.9 |
HIP 9275 |
25.34 |
| 2026-02-22 00:00 |
01:58:18.69 |
+03:16:04.7 |
HIP 9275 |
20.14 |
| 2026-02-22 12:00 |
01:58:38.75 |
+03:18:29.6 |
HIP 9275 |
15.17 |
| 2026-02-23 00:00 |
01:58:58.91 |
+03:20:54.7 |
HIP 9275 |
10.77 |
| 2026-02-23 12:00 |
01:59:19.18 |
+03:23:20.0 |
HIP 9275 |
8.01 |
| 2026-02-24 00:00 |
01:59:39.55 |
+03:25:45.5 |
HIP 9275 |
8.69 |