メタデータ
| 項目 |
値 |
| Designation |
C/2000 OF8 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-08-04T19:13:02.890560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:05Z |
| Obs used |
72 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
4.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2000-09-24.0000000 |
| e |
1.00180402 |
| q (au) |
2.172785 |
| a (au) |
-1204.412900 |
| i (deg) |
152.432608 |
| Ω (om, deg) |
117.090492 |
| ω (w, deg) |
256.080338 |
| M (ma, deg) |
-0.007423 |
等級
散乱 + 全体線形
$$
M_a = (14.880 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.880 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
04:16:51.30 |
+42:27:53.5 |
HIP 20063 |
24.05 |
| 2026-05-12 12:00 |
04:16:54.35 |
+42:27:56.0 |
HIP 20063 |
23.76 |
| 2026-05-13 00:00 |
04:16:57.40 |
+42:27:58.6 |
HIP 20063 |
23.48 |
| 2026-05-13 12:00 |
04:17:00.45 |
+42:28:01.2 |
HIP 20063 |
23.20 |
| 2026-05-14 00:00 |
04:17:03.52 |
+42:28:04.1 |
HIP 20063 |
22.94 |
| 2026-05-14 12:00 |
04:17:06.58 |
+42:28:07.0 |
HIP 20063 |
22.70 |
| 2026-05-15 00:00 |
04:17:09.66 |
+42:28:10.0 |
HIP 20063 |
22.46 |
| 2026-05-15 12:00 |
04:17:12.74 |
+42:28:13.2 |
HIP 20063 |
22.24 |
| 2026-05-16 00:00 |
04:17:15.83 |
+42:28:16.5 |
HIP 20063 |
22.03 |
| 2026-05-16 12:00 |
04:17:18.92 |
+42:28:19.9 |
HIP 20155 |
21.77 |
| 2026-05-17 00:00 |
04:17:22.01 |
+42:28:23.4 |
HIP 20155 |
21.23 |
| 2026-05-17 12:00 |
04:17:25.11 |
+42:28:27.0 |
HIP 20155 |
20.69 |
| 2026-05-18 00:00 |
04:17:28.22 |
+42:28:30.7 |
HIP 20155 |
20.16 |
| 2026-05-18 12:00 |
04:17:31.33 |
+42:28:34.6 |
HIP 20155 |
19.63 |
| 2026-05-19 00:00 |
04:17:34.44 |
+42:28:38.6 |
HIP 20155 |
19.10 |
| 2026-05-19 12:00 |
04:17:37.56 |
+42:28:42.6 |
HIP 20155 |
18.57 |
| 2026-05-20 00:00 |
04:17:40.68 |
+42:28:46.8 |
HIP 20155 |
18.05 |
| 2026-05-20 12:00 |
04:17:43.80 |
+42:28:51.2 |
HIP 20155 |
17.53 |
| 2026-05-21 00:00 |
04:17:46.93 |
+42:28:55.6 |
HIP 20155 |
17.01 |
| 2026-05-21 12:00 |
04:17:50.06 |
+42:29:00.1 |
HIP 20155 |
16.50 |
| 2026-05-22 00:00 |
04:17:53.19 |
+42:29:04.8 |
HIP 20155 |
16.00 |
| 2026-05-22 12:00 |
04:17:56.33 |
+42:29:09.5 |
HIP 20155 |
15.50 |
| 2026-05-23 00:00 |
04:17:59.47 |
+42:29:14.4 |
HIP 20155 |
15.00 |
| 2026-05-23 12:00 |
04:18:02.60 |
+42:29:19.4 |
HIP 20155 |
14.52 |
| 2026-05-24 00:00 |
04:18:05.75 |
+42:29:24.5 |
HIP 20155 |
14.04 |
| 2026-05-24 12:00 |
04:18:08.89 |
+42:29:29.7 |
HIP 20155 |
13.57 |
| 2026-05-25 00:00 |
04:18:12.03 |
+42:29:35.0 |
HIP 20155 |
13.11 |
| 2026-05-25 12:00 |
04:18:15.18 |
+42:29:40.5 |
HIP 20155 |
12.67 |
| 2026-05-26 00:00 |
04:18:18.32 |
+42:29:46.0 |
HIP 20155 |
12.23 |
| 2026-05-26 12:00 |
04:18:21.47 |
+42:29:51.6 |
HIP 20155 |
11.81 |
| 2026-05-27 00:00 |
04:18:24.61 |
+42:29:57.4 |
HIP 20155 |
11.41 |
| 2026-05-27 12:00 |
04:18:27.76 |
+42:30:03.3 |
HIP 20155 |
11.02 |
| 2026-05-28 00:00 |
04:18:30.91 |
+42:30:09.2 |
HIP 20155 |
10.65 |
| 2026-05-28 12:00 |
04:18:34.05 |
+42:30:15.3 |
HIP 20155 |
10.31 |
| 2026-05-29 00:00 |
04:18:37.20 |
+42:30:21.5 |
HIP 20155 |
9.99 |
| 2026-05-29 12:00 |
04:18:40.35 |
+42:30:27.8 |
HIP 20155 |
9.70 |
| 2026-05-30 00:00 |
04:18:43.49 |
+42:30:34.2 |
HIP 20155 |
9.43 |
| 2026-05-30 12:00 |
04:18:46.63 |
+42:30:40.7 |
HIP 20155 |
9.20 |
| 2026-05-31 00:00 |
04:18:49.78 |
+42:30:47.3 |
HIP 20155 |
9.00 |
| 2026-05-31 12:00 |
04:18:52.92 |
+42:30:54.0 |
HIP 20155 |
8.84 |
| 2026-06-01 00:00 |
04:18:56.06 |
+42:31:00.8 |
HIP 20155 |
8.72 |
| 2026-06-01 12:00 |
04:18:59.20 |
+42:31:07.7 |
HIP 20155 |
8.64 |
| 2026-06-02 00:00 |
04:19:02.33 |
+42:31:14.7 |
HIP 20155 |
8.60 |