メタデータ
| 項目 |
値 |
| Designation |
C/2002 Y1 (Juels-Holvorcem) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-04-13T05:57:14.526720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:25Z |
| Obs used |
760 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
16.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2003-02-10.0000000 |
| e |
0.99715189 |
| q (au) |
0.713810 |
| a (au) |
250.625452 |
| i (deg) |
103.781543 |
| Ω (om, deg) |
166.220096 |
| ω (w, deg) |
128.815568 |
| M (ma, deg) |
359.984537 |
等級
散乱 + 全体線形
$$
M_a = (6.760 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.760 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2002-01-12 |
2003-01-11 |
-33.2594 |
+10.778 |
| 2003-01-11 |
2003-04-12 |
+5.2439 |
+0.172 |
| 2003-04-13 |
2004-01-23 |
-2.2806 |
-1.257 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
09:56:19.28 |
-58:00:23.2 |
HIP 48617 |
20.31 |
| 2026-06-01 12:00 |
09:56:20.41 |
-57:59:46.5 |
HIP 48617 |
19.90 |
| 2026-06-02 00:00 |
09:56:21.58 |
-57:59:10.0 |
HIP 48617 |
19.50 |
| 2026-06-02 12:00 |
09:56:22.79 |
-57:58:33.5 |
HIP 48617 |
19.12 |
| 2026-06-03 00:00 |
09:56:24.04 |
-57:57:57.2 |
HIP 48617 |
18.76 |
| 2026-06-03 12:00 |
09:56:25.33 |
-57:57:21.0 |
HIP 48761 |
18.25 |
| 2026-06-04 00:00 |
09:56:26.65 |
-57:56:45.0 |
HIP 48761 |
17.64 |
| 2026-06-04 12:00 |
09:56:28.01 |
-57:56:09.1 |
HIP 48761 |
17.02 |
| 2026-06-05 00:00 |
09:56:29.40 |
-57:55:33.3 |
HIP 48761 |
16.40 |
| 2026-06-05 12:00 |
09:56:30.84 |
-57:54:57.6 |
HIP 48761 |
15.79 |
| 2026-06-06 00:00 |
09:56:32.31 |
-57:54:22.1 |
HIP 48761 |
15.18 |
| 2026-06-06 12:00 |
09:56:33.81 |
-57:53:46.7 |
HIP 48761 |
14.57 |
| 2026-06-07 00:00 |
09:56:35.36 |
-57:53:11.5 |
HIP 48761 |
13.96 |
| 2026-06-07 12:00 |
09:56:36.94 |
-57:52:36.4 |
HIP 48761 |
13.36 |
| 2026-06-08 00:00 |
09:56:38.55 |
-57:52:01.5 |
HIP 48761 |
12.77 |
| 2026-06-08 12:00 |
09:56:40.21 |
-57:51:26.7 |
HIP 48761 |
12.17 |
| 2026-06-09 00:00 |
09:56:41.90 |
-57:50:52.1 |
HIP 48761 |
11.59 |
| 2026-06-09 12:00 |
09:56:43.62 |
-57:50:17.6 |
HIP 48761 |
11.01 |
| 2026-06-10 00:00 |
09:56:45.38 |
-57:49:43.3 |
HIP 48761 |
10.43 |
| 2026-06-10 12:00 |
09:56:47.18 |
-57:49:09.1 |
HIP 48761 |
9.87 |
| 2026-06-11 00:00 |
09:56:49.01 |
-57:48:35.1 |
HIP 48761 |
9.31 |
| 2026-06-11 12:00 |
09:56:50.88 |
-57:48:01.3 |
HIP 48761 |
8.76 |
| 2026-06-12 00:00 |
09:56:52.78 |
-57:47:27.6 |
HIP 48761 |
8.23 |
| 2026-06-12 12:00 |
09:56:54.72 |
-57:46:54.1 |
HIP 48761 |
7.72 |
| 2026-06-13 00:00 |
09:56:56.69 |
-57:46:20.8 |
HIP 48761 |
7.22 |
| 2026-06-13 12:00 |
09:56:58.69 |
-57:45:47.7 |
HIP 48761 |
6.75 |
| 2026-06-14 00:00 |
09:57:00.74 |
-57:45:14.7 |
HIP 48761 |
6.30 |
| 2026-06-14 12:00 |
09:57:02.81 |
-57:44:41.9 |
HIP 48761 |
5.89 |
| 2026-06-15 00:00 |
09:57:04.92 |
-57:44:09.3 |
HIP 48761 |
5.53 |
| 2026-06-15 12:00 |
09:57:07.07 |
-57:43:36.8 |
HIP 48761 |
5.21 |
| 2026-06-16 00:00 |
09:57:09.24 |
-57:43:04.6 |
HIP 48761 |
4.96 |
| 2026-06-16 12:00 |
09:57:11.46 |
-57:42:32.5 |
HIP 48761 |
4.78 |
| 2026-06-17 00:00 |
09:57:13.70 |
-57:42:00.7 |
HIP 48761 |
4.68 |
| 2026-06-17 12:00 |
09:57:15.98 |
-57:41:29.0 |
HIP 48761 |
4.66 |
| 2026-06-18 00:00 |
09:57:18.29 |
-57:40:57.5 |
HIP 48761 |
4.72 |
| 2026-06-18 12:00 |
09:57:20.63 |
-57:40:26.2 |
HIP 48761 |
4.87 |
| 2026-06-19 00:00 |
09:57:23.01 |
-57:39:55.1 |
HIP 48761 |
5.09 |
| 2026-06-19 12:00 |
09:57:25.42 |
-57:39:24.3 |
HIP 48761 |
5.37 |
| 2026-06-20 00:00 |
09:57:27.86 |
-57:38:53.6 |
HIP 48761 |
5.71 |
| 2026-06-20 12:00 |
09:57:30.33 |
-57:38:23.1 |
HIP 48761 |
6.10 |
| 2026-06-21 00:00 |
09:57:32.84 |
-57:37:52.8 |
HIP 48761 |
6.52 |
| 2026-06-21 12:00 |
09:57:35.37 |
-57:37:22.7 |
HIP 48761 |
6.97 |
| 2026-06-22 00:00 |
09:57:37.94 |
-57:36:52.9 |
HIP 48761 |
7.45 |