メタデータ
| 項目 |
値 |
| Designation |
C/1998 U1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-05-02T12:00:10.497600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
122 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-11-12.0000000 |
| e |
1.00043848 |
| q (au) |
3.975445 |
| a (au) |
-9066.409392 |
| i (deg) |
156.428505 |
| Ω (om, deg) |
210.457099 |
| ω (w, deg) |
124.645648 |
| M (ma, deg) |
0.000221 |
等級
散乱 + 全体線形
$$
M_a = (12.174 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.174 |
| n |
2.000 |
| gf |
0.858 |
| gb |
-0.501 |
| k |
1.000 |
| δ90 |
2.819 |
| 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) |
| 2026-09-20 00:00 |
20:21:17.19 |
-43:49:02.9 |
HIP 100331 |
13.72 |
| 2026-09-20 12:00 |
20:21:15.09 |
-43:48:55.3 |
HIP 100331 |
13.47 |
| 2026-09-21 00:00 |
20:21:13.02 |
-43:48:47.7 |
HIP 100331 |
13.22 |
| 2026-09-21 12:00 |
20:21:10.97 |
-43:48:39.8 |
HIP 100331 |
12.99 |
| 2026-09-22 00:00 |
20:21:08.95 |
-43:48:31.9 |
HIP 100331 |
12.76 |
| 2026-09-22 12:00 |
20:21:06.95 |
-43:48:23.8 |
HIP 100331 |
12.54 |
| 2026-09-23 00:00 |
20:21:04.97 |
-43:48:15.7 |
HIP 100331 |
12.32 |
| 2026-09-23 12:00 |
20:21:03.02 |
-43:48:07.3 |
HIP 100331 |
12.11 |
| 2026-09-24 00:00 |
20:21:01.09 |
-43:47:58.9 |
HIP 100331 |
11.91 |
| 2026-09-24 12:00 |
20:20:59.19 |
-43:47:50.3 |
HIP 100331 |
11.72 |
| 2026-09-25 00:00 |
20:20:57.32 |
-43:47:41.6 |
HIP 100331 |
11.53 |
| 2026-09-25 12:00 |
20:20:55.47 |
-43:47:32.8 |
HIP 100331 |
11.35 |
| 2026-09-26 00:00 |
20:20:53.64 |
-43:47:23.9 |
HIP 100331 |
11.18 |
| 2026-09-26 12:00 |
20:20:51.84 |
-43:47:14.8 |
HIP 100331 |
11.01 |
| 2026-09-27 00:00 |
20:20:50.06 |
-43:47:05.7 |
HIP 100331 |
10.85 |
| 2026-09-27 12:00 |
20:20:48.31 |
-43:46:56.4 |
HIP 100331 |
10.70 |
| 2026-09-28 00:00 |
20:20:46.59 |
-43:46:47.0 |
HIP 100331 |
10.56 |
| 2026-09-28 12:00 |
20:20:44.89 |
-43:46:37.5 |
HIP 100331 |
10.42 |
| 2026-09-29 00:00 |
20:20:43.22 |
-43:46:27.8 |
HIP 100331 |
10.29 |
| 2026-09-29 12:00 |
20:20:41.57 |
-43:46:18.0 |
HIP 100331 |
10.17 |
| 2026-09-30 00:00 |
20:20:39.95 |
-43:46:08.2 |
HIP 100331 |
10.06 |
| 2026-09-30 12:00 |
20:20:38.36 |
-43:45:58.2 |
HIP 100331 |
9.95 |
| 2026-10-01 00:00 |
20:20:36.79 |
-43:45:48.1 |
HIP 100331 |
9.85 |
| 2026-10-01 12:00 |
20:20:35.25 |
-43:45:37.9 |
HIP 100331 |
9.76 |
| 2026-10-02 00:00 |
20:20:33.73 |
-43:45:27.5 |
HIP 100331 |
9.67 |
| 2026-10-02 12:00 |
20:20:32.24 |
-43:45:17.1 |
HIP 100331 |
9.60 |
| 2026-10-03 00:00 |
20:20:30.78 |
-43:45:06.6 |
HIP 100331 |
9.52 |
| 2026-10-03 12:00 |
20:20:29.34 |
-43:44:55.9 |
HIP 100331 |
9.46 |
| 2026-10-04 00:00 |
20:20:27.93 |
-43:44:45.1 |
HIP 100331 |
9.40 |
| 2026-10-04 12:00 |
20:20:26.55 |
-43:44:34.2 |
HIP 100331 |
9.35 |
| 2026-10-05 00:00 |
20:20:25.19 |
-43:44:23.3 |
HIP 100331 |
9.30 |
| 2026-10-05 12:00 |
20:20:23.87 |
-43:44:12.2 |
HIP 100331 |
9.26 |
| 2026-10-06 00:00 |
20:20:22.57 |
-43:44:01.0 |
HIP 100331 |
9.22 |
| 2026-10-06 12:00 |
20:20:21.29 |
-43:43:49.7 |
HIP 100331 |
9.19 |
| 2026-10-07 00:00 |
20:20:20.05 |
-43:43:38.3 |
HIP 100331 |
9.17 |
| 2026-10-07 12:00 |
20:20:18.83 |
-43:43:26.8 |
HIP 100331 |
9.15 |
| 2026-10-08 00:00 |
20:20:17.64 |
-43:43:15.2 |
HIP 100331 |
9.13 |
| 2026-10-08 12:00 |
20:20:16.47 |
-43:43:03.4 |
HIP 100331 |
9.12 |
| 2026-10-09 00:00 |
20:20:15.34 |
-43:42:51.6 |
HIP 100331 |
9.12 |
| 2026-10-09 12:00 |
20:20:14.23 |
-43:42:39.7 |
HIP 100331 |
9.11 |
| 2026-10-10 00:00 |
20:20:13.15 |
-43:42:27.7 |
HIP 100331 |
9.12 |
| 2026-10-10 12:00 |
20:20:12.10 |
-43:42:15.6 |
HIP 100331 |
9.12 |
| 2026-10-11 00:00 |
20:20:11.08 |
-43:42:03.4 |
HIP 100331 |
9.13 |