メタデータ
| 項目 |
値 |
| Designation |
C/1997 T1 (Utsunomiya) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1997-12-10T03:28:30.063360Z |
| Orbit solution date (soln_date, UTC) |
2022-02-03T20:42:52Z |
| Obs used |
681 |
| NEO |
- |
| M1 |
7.900 |
| K1 |
18.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1997-11-20.0000000 |
| e |
0.99851974 |
| q (au) |
1.359109 |
| a (au) |
918.157376 |
| i (deg) |
127.992638 |
| Ω (om, deg) |
53.702748 |
| ω (w, deg) |
95.965142 |
| M (ma, deg) |
359.999286 |
等級
散乱 + 全体線形
$$
M_a = (6.692 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.692 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
09:26:20.95 |
-39:54:44.7 |
HIP 46244 |
25.37 |
| 2026-03-26 12:00 |
09:26:18.79 |
-39:54:19.1 |
HIP 46244 |
25.65 |
| 2026-03-27 00:00 |
09:26:16.65 |
-39:53:53.5 |
HIP 46244 |
25.95 |
| 2026-03-27 12:00 |
09:26:14.52 |
-39:53:27.7 |
HIP 46244 |
26.26 |
| 2026-03-28 00:00 |
09:26:12.42 |
-39:53:01.8 |
HIP 46244 |
26.57 |
| 2026-03-28 12:00 |
09:26:10.34 |
-39:52:35.8 |
HIP 46244 |
26.91 |
| 2026-03-29 00:00 |
09:26:08.27 |
-39:52:09.6 |
HIP 46244 |
27.25 |
| 2026-03-29 12:00 |
09:26:06.22 |
-39:51:43.4 |
HIP 46244 |
27.60 |
| 2026-03-30 00:00 |
09:26:04.20 |
-39:51:17.0 |
HIP 46244 |
27.97 |
| 2026-03-30 12:00 |
09:26:02.19 |
-39:50:50.5 |
HIP 46244 |
28.34 |
| 2026-03-31 00:00 |
09:26:00.21 |
-39:50:23.8 |
HIP 46244 |
28.73 |
| 2026-03-31 12:00 |
09:25:58.24 |
-39:49:57.1 |
HIP 46244 |
29.12 |
| 2026-04-01 00:00 |
09:25:56.30 |
-39:49:30.3 |
HIP 46244 |
29.52 |
| 2026-04-01 12:00 |
09:25:54.37 |
-39:49:03.3 |
HIP 46244 |
29.93 |
| 2026-04-02 00:00 |
09:25:52.47 |
-39:48:36.2 |
HIP 46114 |
29.59 |
| 2026-04-02 12:00 |
09:25:50.59 |
-39:48:09.1 |
HIP 46114 |
29.01 |
| 2026-04-03 00:00 |
09:25:48.73 |
-39:47:41.8 |
HIP 46114 |
28.44 |
| 2026-04-03 12:00 |
09:25:46.89 |
-39:47:14.5 |
HIP 46114 |
27.86 |
| 2026-04-04 00:00 |
09:25:45.07 |
-39:46:47.0 |
HIP 46114 |
27.28 |
| 2026-04-04 12:00 |
09:25:43.27 |
-39:46:19.4 |
HIP 46114 |
26.71 |
| 2026-04-05 00:00 |
09:25:41.49 |
-39:45:51.8 |
HIP 46114 |
26.14 |
| 2026-04-05 12:00 |
09:25:39.73 |
-39:45:24.0 |
HIP 46114 |
25.56 |
| 2026-04-06 00:00 |
09:25:38.00 |
-39:44:56.2 |
HIP 46114 |
24.99 |
| 2026-04-06 12:00 |
09:25:36.29 |
-39:44:28.3 |
HIP 46114 |
24.42 |
| 2026-04-07 00:00 |
09:25:34.59 |
-39:44:00.3 |
HIP 46114 |
23.86 |
| 2026-04-07 12:00 |
09:25:32.92 |
-39:43:32.2 |
HIP 46114 |
23.29 |
| 2026-04-08 00:00 |
09:25:31.28 |
-39:43:04.0 |
HIP 46114 |
22.73 |
| 2026-04-08 12:00 |
09:25:29.65 |
-39:42:35.7 |
HIP 46114 |
22.17 |
| 2026-04-09 00:00 |
09:25:28.05 |
-39:42:07.4 |
HIP 46114 |
21.61 |
| 2026-04-09 12:00 |
09:25:26.47 |
-39:41:39.0 |
HIP 46114 |
21.05 |
| 2026-04-10 00:00 |
09:25:24.91 |
-39:41:10.5 |
HIP 46114 |
20.49 |
| 2026-04-10 12:00 |
09:25:23.37 |
-39:40:42.0 |
HIP 46114 |
19.94 |
| 2026-04-11 00:00 |
09:25:21.86 |
-39:40:13.4 |
HIP 46114 |
19.39 |
| 2026-04-11 12:00 |
09:25:20.37 |
-39:39:44.7 |
HIP 46114 |
18.84 |
| 2026-04-12 00:00 |
09:25:18.90 |
-39:39:15.9 |
HIP 46114 |
18.29 |
| 2026-04-12 12:00 |
09:25:17.45 |
-39:38:47.1 |
HIP 46114 |
17.75 |
| 2026-04-13 00:00 |
09:25:16.03 |
-39:38:18.3 |
HIP 46114 |
17.21 |
| 2026-04-13 12:00 |
09:25:14.63 |
-39:37:49.3 |
HIP 46114 |
16.67 |
| 2026-04-14 00:00 |
09:25:13.25 |
-39:37:20.4 |
HIP 46114 |
16.13 |
| 2026-04-14 12:00 |
09:25:11.90 |
-39:36:51.3 |
HIP 46114 |
15.60 |
| 2026-04-15 00:00 |
09:25:10.57 |
-39:36:22.2 |
HIP 46114 |
15.07 |
| 2026-04-15 12:00 |
09:25:09.26 |
-39:35:53.1 |
HIP 46114 |
14.55 |
| 2026-04-16 00:00 |
09:25:07.98 |
-39:35:23.9 |
HIP 46114 |
14.03 |