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) |
| 2026-07-29 00:00 |
10:01:58.90 |
-57:11:25.9 |
HIP 49160 |
9.56 |
| 2026-07-29 12:00 |
10:02:03.15 |
-57:11:15.7 |
HIP 49160 |
9.75 |
| 2026-07-30 00:00 |
10:02:07.42 |
-57:11:05.7 |
HIP 49160 |
9.98 |
| 2026-07-30 12:00 |
10:02:11.70 |
-57:10:56.0 |
HIP 49160 |
10.22 |
| 2026-07-31 00:00 |
10:02:15.99 |
-57:10:46.6 |
HIP 49160 |
10.50 |
| 2026-07-31 12:00 |
10:02:20.30 |
-57:10:37.5 |
HIP 49160 |
10.79 |
| 2026-08-01 00:00 |
10:02:24.61 |
-57:10:28.7 |
HIP 49160 |
11.11 |
| 2026-08-01 12:00 |
10:02:28.94 |
-57:10:20.2 |
HIP 49160 |
11.44 |
| 2026-08-02 00:00 |
10:02:33.28 |
-57:10:12.0 |
HIP 49160 |
11.79 |
| 2026-08-02 12:00 |
10:02:37.63 |
-57:10:04.1 |
HIP 49160 |
12.16 |
| 2026-08-03 00:00 |
10:02:41.99 |
-57:09:56.5 |
HIP 49160 |
12.54 |
| 2026-08-03 12:00 |
10:02:46.37 |
-57:09:49.2 |
HIP 49160 |
12.94 |
| 2026-08-04 00:00 |
10:02:50.75 |
-57:09:42.2 |
HIP 49160 |
13.35 |
| 2026-08-04 12:00 |
10:02:55.14 |
-57:09:35.5 |
HIP 49160 |
13.76 |
| 2026-08-05 00:00 |
10:02:59.55 |
-57:09:29.1 |
HIP 49160 |
14.19 |
| 2026-08-05 12:00 |
10:03:03.96 |
-57:09:23.0 |
HIP 49160 |
14.63 |
| 2026-08-06 00:00 |
10:03:08.38 |
-57:09:17.2 |
HIP 49160 |
15.08 |
| 2026-08-06 12:00 |
10:03:12.81 |
-57:09:11.7 |
HIP 49160 |
15.53 |
| 2026-08-07 00:00 |
10:03:17.25 |
-57:09:06.5 |
HIP 49160 |
15.99 |
| 2026-08-07 12:00 |
10:03:21.70 |
-57:09:01.6 |
HIP 49160 |
16.46 |
| 2026-08-08 00:00 |
10:03:26.15 |
-57:08:57.0 |
HIP 49160 |
16.94 |
| 2026-08-08 12:00 |
10:03:30.62 |
-57:08:52.8 |
HIP 49160 |
17.41 |
| 2026-08-09 00:00 |
10:03:35.09 |
-57:08:48.8 |
HIP 49160 |
17.90 |
| 2026-08-09 12:00 |
10:03:39.57 |
-57:08:45.1 |
HIP 49160 |
18.39 |
| 2026-08-10 00:00 |
10:03:44.05 |
-57:08:41.8 |
HIP 49393 |
18.21 |
| 2026-08-10 12:00 |
10:03:48.55 |
-57:08:38.7 |
HIP 49393 |
17.82 |
| 2026-08-11 00:00 |
10:03:53.05 |
-57:08:35.9 |
HIP 49393 |
17.45 |
| 2026-08-11 12:00 |
10:03:57.55 |
-57:08:33.5 |
HIP 49393 |
17.09 |
| 2026-08-12 00:00 |
10:04:02.06 |
-57:08:31.4 |
HIP 49393 |
16.75 |
| 2026-08-12 12:00 |
10:04:06.58 |
-57:08:29.5 |
HIP 49393 |
16.44 |
| 2026-08-13 00:00 |
10:04:11.10 |
-57:08:28.0 |
HIP 49393 |
16.14 |
| 2026-08-13 12:00 |
10:04:15.63 |
-57:08:26.8 |
HIP 49393 |
15.87 |
| 2026-08-14 00:00 |
10:04:20.16 |
-57:08:25.8 |
HIP 49393 |
15.62 |
| 2026-08-14 12:00 |
10:04:24.70 |
-57:08:25.2 |
HIP 49393 |
15.40 |
| 2026-08-15 00:00 |
10:04:29.24 |
-57:08:24.9 |
HIP 49393 |
15.20 |
| 2026-08-15 12:00 |
10:04:33.78 |
-57:08:24.9 |
HIP 49393 |
15.03 |
| 2026-08-16 00:00 |
10:04:38.33 |
-57:08:25.2 |
HIP 49393 |
14.89 |
| 2026-08-16 12:00 |
10:04:42.88 |
-57:08:25.8 |
HIP 49393 |
14.78 |
| 2026-08-17 00:00 |
10:04:47.43 |
-57:08:26.8 |
HIP 49393 |
14.70 |
| 2026-08-17 12:00 |
10:04:51.99 |
-57:08:28.0 |
HIP 49393 |
14.65 |
| 2026-08-18 00:00 |
10:04:56.54 |
-57:08:29.5 |
HIP 49393 |
14.63 |
| 2026-08-18 12:00 |
10:05:01.10 |
-57:08:31.3 |
HIP 49393 |
14.64 |
| 2026-08-19 00:00 |
10:05:05.67 |
-57:08:33.5 |
HIP 49393 |
14.69 |