C/2002 Y1 (Juels-Holvorcem)
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 |
2002-08-11 |
-71.9770 |
+39.288 |
| 2002-08-11 |
2003-04-12 |
+5.3544 |
+0.171 |
| 2003-04-13 |
2003-07-15 |
-5.4825 |
-1.114 |
| 2003-07-15 |
2004-01-23 |
-1.2917 |
-1.255 |
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) |
| 2026-02-03 00:00 |
10:07:56.96 |
-59:42:31.2 |
HIP 49592 |
27.68 |
| 2026-02-03 12:00 |
10:07:52.07 |
-59:42:36.4 |
HIP 49592 |
27.69 |
| 2026-02-04 00:00 |
10:07:47.17 |
-59:42:41.4 |
HIP 49592 |
27.70 |
| 2026-02-04 12:00 |
10:07:42.26 |
-59:42:45.9 |
HIP 49592 |
27.72 |
| 2026-02-05 00:00 |
10:07:37.33 |
-59:42:50.2 |
HIP 49592 |
27.75 |
| 2026-02-05 12:00 |
10:07:32.39 |
-59:42:54.1 |
HIP 49592 |
27.79 |
| 2026-02-06 00:00 |
10:07:27.45 |
-59:42:57.6 |
HIP 49592 |
27.84 |
| 2026-02-06 12:00 |
10:07:22.49 |
-59:43:00.7 |
HIP 49592 |
27.89 |
| 2026-02-07 00:00 |
10:07:17.52 |
-59:43:03.6 |
HIP 49592 |
27.95 |
| 2026-02-07 12:00 |
10:07:12.54 |
-59:43:06.0 |
HIP 49592 |
28.02 |
| 2026-02-08 00:00 |
10:07:07.55 |
-59:43:08.1 |
HIP 49592 |
28.10 |
| 2026-02-08 12:00 |
10:07:02.55 |
-59:43:09.9 |
HIP 49592 |
28.19 |
| 2026-02-09 00:00 |
10:06:57.54 |
-59:43:11.3 |
HIP 49592 |
28.29 |
| 2026-02-09 12:00 |
10:06:52.53 |
-59:43:12.3 |
HIP 49592 |
28.39 |
| 2026-02-10 00:00 |
10:06:47.50 |
-59:43:13.0 |
HIP 49592 |
28.50 |
| 2026-02-10 12:00 |
10:06:42.47 |
-59:43:13.3 |
HIP 49245 |
27.91 |
| 2026-02-11 00:00 |
10:06:37.43 |
-59:43:13.3 |
HIP 49245 |
27.30 |
| 2026-02-11 12:00 |
10:06:32.39 |
-59:43:12.9 |
HIP 49245 |
26.69 |
| 2026-02-12 00:00 |
10:06:27.34 |
-59:43:12.2 |
HIP 49245 |
26.09 |
| 2026-02-12 12:00 |
10:06:22.28 |
-59:43:11.1 |
HIP 49245 |
25.48 |
| 2026-02-13 00:00 |
10:06:17.22 |
-59:43:09.6 |
HIP 49245 |
24.88 |
| 2026-02-13 12:00 |
10:06:12.16 |
-59:43:07.8 |
HIP 49245 |
24.28 |
| 2026-02-14 00:00 |
10:06:07.09 |
-59:43:05.6 |
HIP 49245 |
23.68 |
| 2026-02-14 12:00 |
10:06:02.01 |
-59:43:03.1 |
HIP 49245 |
23.09 |
| 2026-02-15 00:00 |
10:05:56.93 |
-59:43:00.2 |
HIP 49245 |
22.50 |
| 2026-02-15 12:00 |
10:05:51.85 |
-59:42:56.9 |
HIP 49245 |
21.92 |
| 2026-02-16 00:00 |
10:05:46.77 |
-59:42:53.3 |
HIP 49245 |
21.34 |
| 2026-02-16 12:00 |
10:05:41.69 |
-59:42:49.3 |
HIP 49245 |
20.77 |
| 2026-02-17 00:00 |
10:05:36.60 |
-59:42:45.0 |
HIP 49245 |
20.20 |
| 2026-02-17 12:00 |
10:05:31.52 |
-59:42:40.3 |
HIP 49245 |
19.64 |
| 2026-02-18 00:00 |
10:05:26.43 |
-59:42:35.3 |
HIP 49245 |
19.09 |
| 2026-02-18 12:00 |
10:05:21.34 |
-59:42:29.9 |
HIP 49245 |
18.55 |
| 2026-02-19 00:00 |
10:05:16.25 |
-59:42:24.2 |
HIP 49245 |
18.02 |
| 2026-02-19 12:00 |
10:05:11.17 |
-59:42:18.1 |
HIP 49245 |
17.50 |
| 2026-02-20 00:00 |
10:05:06.08 |
-59:42:11.6 |
HIP 49245 |
16.98 |
| 2026-02-20 12:00 |
10:05:01.00 |
-59:42:04.8 |
HIP 49245 |
16.49 |
| 2026-02-21 00:00 |
10:04:55.92 |
-59:41:57.6 |
HIP 49245 |
16.00 |
| 2026-02-21 12:00 |
10:04:50.84 |
-59:41:50.1 |
HIP 49245 |
15.54 |
| 2026-02-22 00:00 |
10:04:45.77 |
-59:41:42.2 |
HIP 49245 |
15.08 |
| 2026-02-22 12:00 |
10:04:40.70 |
-59:41:34.0 |
HIP 49245 |
14.65 |
| 2026-02-23 00:00 |
10:04:35.63 |
-59:41:25.4 |
HIP 49245 |
14.24 |
| 2026-02-23 12:00 |
10:04:30.57 |
-59:41:16.5 |
HIP 49245 |
13.85 |
| 2026-02-24 00:00 |
10:04:25.52 |
-59:41:07.2 |
HIP 49245 |
13.49 |