C/1997 P2 (Spacewatch)
メタデータ
| 項目 |
値 |
| Designation |
C/1997 P2 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-08-31T03:18:18.817920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
10.200 |
| 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) |
1997-08-29.0000000 |
| e |
1.02794485 |
| q (au) |
4.262988 |
| a (au) |
-152.550043 |
| i (deg) |
14.579088 |
| Ω (om, deg) |
302.910064 |
| ω (w, deg) |
24.504901 |
| M (ma, deg) |
-0.001118 |
等級
散乱 + 全体線形
$$
M_a = (12.430 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.430 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
07:35:22.45 |
+24:20:44.7 |
HIP 36883 |
7.14 |
| 2026-02-03 12:00 |
07:35:20.10 |
+24:20:48.7 |
HIP 36883 |
6.80 |
| 2026-02-04 00:00 |
07:35:17.75 |
+24:20:52.7 |
HIP 36883 |
6.49 |
| 2026-02-04 12:00 |
07:35:15.42 |
+24:20:56.6 |
HIP 36883 |
6.21 |
| 2026-02-05 00:00 |
07:35:13.09 |
+24:21:00.6 |
HIP 36883 |
5.97 |
| 2026-02-05 12:00 |
07:35:10.78 |
+24:21:04.4 |
HIP 36883 |
5.77 |
| 2026-02-06 00:00 |
07:35:08.47 |
+24:21:08.3 |
HIP 36883 |
5.61 |
| 2026-02-06 12:00 |
07:35:06.18 |
+24:21:12.1 |
HIP 36883 |
5.50 |
| 2026-02-07 00:00 |
07:35:03.89 |
+24:21:15.8 |
HIP 36883 |
5.44 |
| 2026-02-07 12:00 |
07:35:01.62 |
+24:21:19.6 |
HIP 36883 |
5.42 |
| 2026-02-08 00:00 |
07:34:59.36 |
+24:21:23.2 |
HIP 36883 |
5.46 |
| 2026-02-08 12:00 |
07:34:57.10 |
+24:21:26.9 |
HIP 36883 |
5.54 |
| 2026-02-09 00:00 |
07:34:54.86 |
+24:21:30.5 |
HIP 36883 |
5.67 |
| 2026-02-09 12:00 |
07:34:52.63 |
+24:21:34.1 |
HIP 36883 |
5.84 |
| 2026-02-10 00:00 |
07:34:50.42 |
+24:21:37.6 |
HIP 36883 |
6.05 |
| 2026-02-10 12:00 |
07:34:48.21 |
+24:21:41.1 |
HIP 36883 |
6.29 |
| 2026-02-11 00:00 |
07:34:46.01 |
+24:21:44.5 |
HIP 36883 |
6.55 |
| 2026-02-11 12:00 |
07:34:43.83 |
+24:21:47.9 |
HIP 36883 |
6.85 |
| 2026-02-12 00:00 |
07:34:41.66 |
+24:21:51.3 |
HIP 36883 |
7.16 |
| 2026-02-12 12:00 |
07:34:39.50 |
+24:21:54.6 |
HIP 36883 |
7.49 |
| 2026-02-13 00:00 |
07:34:37.36 |
+24:21:57.8 |
HIP 36883 |
7.84 |
| 2026-02-13 12:00 |
07:34:35.23 |
+24:22:01.1 |
HIP 36883 |
8.20 |
| 2026-02-14 00:00 |
07:34:33.11 |
+24:22:04.3 |
HIP 36883 |
8.56 |
| 2026-02-14 12:00 |
07:34:31.00 |
+24:22:07.4 |
HIP 36883 |
8.94 |
| 2026-02-15 00:00 |
07:34:28.91 |
+24:22:10.5 |
HIP 36883 |
9.33 |
| 2026-02-15 12:00 |
07:34:26.83 |
+24:22:13.5 |
HIP 36883 |
9.72 |
| 2026-02-16 00:00 |
07:34:24.77 |
+24:22:16.6 |
HIP 36883 |
10.11 |
| 2026-02-16 12:00 |
07:34:22.72 |
+24:22:19.5 |
HIP 36883 |
10.51 |
| 2026-02-17 00:00 |
07:34:20.68 |
+24:22:22.4 |
HIP 36883 |
10.91 |
| 2026-02-17 12:00 |
07:34:18.66 |
+24:22:25.3 |
HIP 36883 |
11.31 |
| 2026-02-18 00:00 |
07:34:16.65 |
+24:22:28.1 |
HIP 36883 |
11.71 |
| 2026-02-18 12:00 |
07:34:14.66 |
+24:22:30.9 |
HIP 36883 |
12.12 |
| 2026-02-19 00:00 |
07:34:12.68 |
+24:22:33.7 |
HIP 36883 |
12.52 |
| 2026-02-19 12:00 |
07:34:10.72 |
+24:22:36.4 |
HIP 36883 |
12.93 |
| 2026-02-20 00:00 |
07:34:08.77 |
+24:22:39.0 |
HIP 36883 |
13.33 |
| 2026-02-20 12:00 |
07:34:06.84 |
+24:22:41.6 |
HIP 36883 |
13.74 |
| 2026-02-21 00:00 |
07:34:04.92 |
+24:22:44.2 |
HIP 36883 |
14.14 |
| 2026-02-21 12:00 |
07:34:03.02 |
+24:22:46.7 |
HIP 36883 |
14.54 |
| 2026-02-22 00:00 |
07:34:01.13 |
+24:22:49.1 |
HIP 36883 |
14.94 |
| 2026-02-22 12:00 |
07:33:59.26 |
+24:22:51.5 |
HIP 36883 |
15.33 |
| 2026-02-23 00:00 |
07:33:57.41 |
+24:22:53.9 |
HIP 36883 |
15.73 |
| 2026-02-23 12:00 |
07:33:55.57 |
+24:22:56.2 |
HIP 36883 |
16.12 |
| 2026-02-24 00:00 |
07:33:53.75 |
+24:22:58.5 |
HIP 36883 |
16.51 |