メタデータ
| 項目 |
値 |
| Designation |
C/2000 W1 (Utsunomiya-Jones) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-12-26T13:25:20.971200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
440 |
| NEO |
- |
| M1 |
12.600 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2000-12-11.0000000 |
| e |
1.00000177 |
| q (au) |
0.321181 |
| a (au) |
-181492.894591 |
| i (deg) |
160.165435 |
| Ω (om, deg) |
10.765960 |
| ω (w, deg) |
51.508868 |
| M (ma, deg) |
-0.000000 |
等級
散乱 + 全体線形
$$
M_a = (11.558 + 3.641\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.558 |
| n |
3.641 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.978 |
| δ90 |
1.000 |
| 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 |
| 2000-11-18 |
2000-11-30 |
-31.0615 |
-1.440 |
| 2000-11-30 |
2000-12-24 |
+5.5320 |
+1.050 |
| 2000-12-28 |
2001-04-26 |
-1.8686 |
+0.093 |
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 |
09:46:29.28 |
-00:30:47.3 |
HIP 48000 |
10.92 |
| 2026-06-01 12:00 |
09:46:29.86 |
-00:30:42.0 |
HIP 48000 |
10.85 |
| 2026-06-02 00:00 |
09:46:30.46 |
-00:30:36.9 |
HIP 48000 |
10.78 |
| 2026-06-02 12:00 |
09:46:31.08 |
-00:30:31.8 |
HIP 48000 |
10.71 |
| 2026-06-03 00:00 |
09:46:31.71 |
-00:30:26.9 |
HIP 48000 |
10.64 |
| 2026-06-03 12:00 |
09:46:32.37 |
-00:30:22.1 |
HIP 48000 |
10.56 |
| 2026-06-04 00:00 |
09:46:33.04 |
-00:30:17.5 |
HIP 48000 |
10.48 |
| 2026-06-04 12:00 |
09:46:33.73 |
-00:30:12.9 |
HIP 48000 |
10.40 |
| 2026-06-05 00:00 |
09:46:34.44 |
-00:30:08.4 |
HIP 48000 |
10.32 |
| 2026-06-05 12:00 |
09:46:35.16 |
-00:30:04.1 |
HIP 48000 |
10.24 |
| 2026-06-06 00:00 |
09:46:35.91 |
-00:30:00.0 |
HIP 48000 |
10.15 |
| 2026-06-06 12:00 |
09:46:36.67 |
-00:29:55.8 |
HIP 48000 |
10.07 |
| 2026-06-07 00:00 |
09:46:37.45 |
-00:29:51.9 |
HIP 48000 |
9.98 |
| 2026-06-07 12:00 |
09:46:38.24 |
-00:29:48.0 |
HIP 48000 |
9.89 |
| 2026-06-08 00:00 |
09:46:39.06 |
-00:29:44.3 |
HIP 48000 |
9.80 |
| 2026-06-08 12:00 |
09:46:39.89 |
-00:29:40.7 |
HIP 48000 |
9.71 |
| 2026-06-09 00:00 |
09:46:40.74 |
-00:29:37.2 |
HIP 48000 |
9.62 |
| 2026-06-09 12:00 |
09:46:41.61 |
-00:29:33.9 |
HIP 48000 |
9.53 |
| 2026-06-10 00:00 |
09:46:42.49 |
-00:29:30.6 |
HIP 48000 |
9.44 |
| 2026-06-10 12:00 |
09:46:43.39 |
-00:29:27.5 |
HIP 48000 |
9.35 |
| 2026-06-11 00:00 |
09:46:44.31 |
-00:29:24.5 |
HIP 48000 |
9.26 |
| 2026-06-11 12:00 |
09:46:45.24 |
-00:29:21.6 |
HIP 48000 |
9.18 |
| 2026-06-12 00:00 |
09:46:46.20 |
-00:29:18.9 |
HIP 48000 |
9.09 |
| 2026-06-12 12:00 |
09:46:47.17 |
-00:29:16.3 |
HIP 48000 |
9.01 |
| 2026-06-13 00:00 |
09:46:48.15 |
-00:29:13.8 |
HIP 48000 |
8.93 |
| 2026-06-13 12:00 |
09:46:49.16 |
-00:29:11.4 |
HIP 48000 |
8.85 |
| 2026-06-14 00:00 |
09:46:50.18 |
-00:29:09.1 |
HIP 48000 |
8.77 |
| 2026-06-14 12:00 |
09:46:51.21 |
-00:29:07.0 |
HIP 48000 |
8.70 |
| 2026-06-15 00:00 |
09:46:52.27 |
-00:29:05.0 |
HIP 48000 |
8.63 |
| 2026-06-15 12:00 |
09:46:53.33 |
-00:29:03.1 |
HIP 48000 |
8.57 |
| 2026-06-16 00:00 |
09:46:54.42 |
-00:29:01.3 |
HIP 48000 |
8.51 |
| 2026-06-16 12:00 |
09:46:55.52 |
-00:28:59.7 |
HIP 48000 |
8.45 |
| 2026-06-17 00:00 |
09:46:56.64 |
-00:28:58.1 |
HIP 48000 |
8.40 |
| 2026-06-17 12:00 |
09:46:57.78 |
-00:28:56.8 |
HIP 48000 |
8.36 |
| 2026-06-18 00:00 |
09:46:58.93 |
-00:28:55.5 |
HIP 48000 |
8.33 |
| 2026-06-18 12:00 |
09:47:00.09 |
-00:28:54.3 |
HIP 48000 |
8.30 |
| 2026-06-19 00:00 |
09:47:01.27 |
-00:28:53.3 |
HIP 48000 |
8.28 |
| 2026-06-19 12:00 |
09:47:02.47 |
-00:28:52.4 |
HIP 48000 |
8.26 |
| 2026-06-20 00:00 |
09:47:03.68 |
-00:28:51.6 |
HIP 48000 |
8.26 |
| 2026-06-20 12:00 |
09:47:04.91 |
-00:28:51.0 |
HIP 48000 |
8.27 |
| 2026-06-21 00:00 |
09:47:06.16 |
-00:28:50.4 |
HIP 48000 |
8.28 |
| 2026-06-21 12:00 |
09:47:07.42 |
-00:28:50.0 |
HIP 48000 |
8.31 |
| 2026-06-22 00:00 |
09:47:08.69 |
-00:28:49.7 |
HIP 48000 |
8.34 |