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) |
| 2026-05-12 00:00 |
09:46:21.57 |
-00:35:50.9 |
HIP 48000 |
10.90 |
| 2026-05-12 12:00 |
09:46:21.38 |
-00:35:41.2 |
HIP 48000 |
10.97 |
| 2026-05-13 00:00 |
09:46:21.21 |
-00:35:31.6 |
HIP 48000 |
11.03 |
| 2026-05-13 12:00 |
09:46:21.06 |
-00:35:22.1 |
HIP 48000 |
11.09 |
| 2026-05-14 00:00 |
09:46:20.94 |
-00:35:12.8 |
HIP 48000 |
11.15 |
| 2026-05-14 12:00 |
09:46:20.83 |
-00:35:03.5 |
HIP 48000 |
11.20 |
| 2026-05-15 00:00 |
09:46:20.74 |
-00:34:54.3 |
HIP 48000 |
11.25 |
| 2026-05-15 12:00 |
09:46:20.67 |
-00:34:45.2 |
HIP 48000 |
11.30 |
| 2026-05-16 00:00 |
09:46:20.62 |
-00:34:36.2 |
HIP 48000 |
11.34 |
| 2026-05-16 12:00 |
09:46:20.59 |
-00:34:27.4 |
HIP 48000 |
11.39 |
| 2026-05-17 00:00 |
09:46:20.58 |
-00:34:18.6 |
HIP 48000 |
11.42 |
| 2026-05-17 12:00 |
09:46:20.59 |
-00:34:09.9 |
HIP 48000 |
11.46 |
| 2026-05-18 00:00 |
09:46:20.62 |
-00:34:01.4 |
HIP 48000 |
11.49 |
| 2026-05-18 12:00 |
09:46:20.67 |
-00:33:53.0 |
HIP 48000 |
11.51 |
| 2026-05-19 00:00 |
09:46:20.74 |
-00:33:44.6 |
HIP 48000 |
11.54 |
| 2026-05-19 12:00 |
09:46:20.83 |
-00:33:36.4 |
HIP 48000 |
11.56 |
| 2026-05-20 00:00 |
09:46:20.94 |
-00:33:28.3 |
HIP 48000 |
11.57 |
| 2026-05-20 12:00 |
09:46:21.06 |
-00:33:20.3 |
HIP 48000 |
11.59 |
| 2026-05-21 00:00 |
09:46:21.21 |
-00:33:12.4 |
HIP 48000 |
11.59 |
| 2026-05-21 12:00 |
09:46:21.38 |
-00:33:04.6 |
HIP 48000 |
11.60 |
| 2026-05-22 00:00 |
09:46:21.56 |
-00:32:56.9 |
HIP 48000 |
11.60 |
| 2026-05-22 12:00 |
09:46:21.77 |
-00:32:49.4 |
HIP 48000 |
11.60 |
| 2026-05-23 00:00 |
09:46:21.99 |
-00:32:41.9 |
HIP 48000 |
11.59 |
| 2026-05-23 12:00 |
09:46:22.24 |
-00:32:34.6 |
HIP 48000 |
11.58 |
| 2026-05-24 00:00 |
09:46:22.50 |
-00:32:27.4 |
HIP 48000 |
11.57 |
| 2026-05-24 12:00 |
09:46:22.78 |
-00:32:20.3 |
HIP 48000 |
11.56 |
| 2026-05-25 00:00 |
09:46:23.08 |
-00:32:13.3 |
HIP 48000 |
11.54 |
| 2026-05-25 12:00 |
09:46:23.41 |
-00:32:06.4 |
HIP 48000 |
11.51 |
| 2026-05-26 00:00 |
09:46:23.74 |
-00:31:59.6 |
HIP 48000 |
11.49 |
| 2026-05-26 12:00 |
09:46:24.10 |
-00:31:52.9 |
HIP 48000 |
11.46 |
| 2026-05-27 00:00 |
09:46:24.48 |
-00:31:46.4 |
HIP 48000 |
11.42 |
| 2026-05-27 12:00 |
09:46:24.88 |
-00:31:40.0 |
HIP 48000 |
11.39 |
| 2026-05-28 00:00 |
09:46:25.29 |
-00:31:33.7 |
HIP 48000 |
11.35 |
| 2026-05-28 12:00 |
09:46:25.72 |
-00:31:27.5 |
HIP 48000 |
11.31 |
| 2026-05-29 00:00 |
09:46:26.18 |
-00:31:21.4 |
HIP 48000 |
11.26 |
| 2026-05-29 12:00 |
09:46:26.65 |
-00:31:15.4 |
HIP 48000 |
11.21 |
| 2026-05-30 00:00 |
09:46:27.14 |
-00:31:09.6 |
HIP 48000 |
11.16 |
| 2026-05-30 12:00 |
09:46:27.64 |
-00:31:03.8 |
HIP 48000 |
11.10 |
| 2026-05-31 00:00 |
09:46:28.17 |
-00:30:58.2 |
HIP 48000 |
11.04 |
| 2026-05-31 12:00 |
09:46:28.71 |
-00:30:52.7 |
HIP 48000 |
10.98 |
| 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 |