メタデータ
| 項目 |
値 |
| Designation |
C/1998 U5 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-12-21T18:14:25.114560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:57Z |
| Obs used |
406 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
15.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-12-01.0000000 |
| e |
0.98797943 |
| q (au) |
1.236453 |
| a (au) |
102.861449 |
| i (deg) |
131.764750 |
| Ω (om, deg) |
66.650605 |
| ω (w, deg) |
51.134275 |
| M (ma, deg) |
359.980387 |
等級
散乱 + 全体線形
$$
M_a = (8.137 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.137 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.503 |
| 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 |
| 1998-10-30 |
1998-12-21 |
+23.4645 |
-2.542 |
| 1998-12-21 |
1999-05-11 |
-3.5652 |
+0.381 |
| 1999-05-11 |
1999-12-09 |
-44.9953 |
+16.194 |
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) |
| 2026-07-29 00:00 |
13:52:54.88 |
-38:42:10.8 |
HIP 67712 |
8.78 |
| 2026-07-29 12:00 |
13:52:55.09 |
-38:41:55.7 |
HIP 67712 |
8.68 |
| 2026-07-30 00:00 |
13:52:55.33 |
-38:41:40.8 |
HIP 67712 |
8.59 |
| 2026-07-30 12:00 |
13:52:55.59 |
-38:41:25.9 |
HIP 67712 |
8.51 |
| 2026-07-31 00:00 |
13:52:55.87 |
-38:41:11.2 |
HIP 67712 |
8.44 |
| 2026-07-31 12:00 |
13:52:56.18 |
-38:40:56.6 |
HIP 67712 |
8.39 |
| 2026-08-01 00:00 |
13:52:56.52 |
-38:40:42.1 |
HIP 67712 |
8.34 |
| 2026-08-01 12:00 |
13:52:56.87 |
-38:40:27.7 |
HIP 67712 |
8.31 |
| 2026-08-02 00:00 |
13:52:57.26 |
-38:40:13.5 |
HIP 67712 |
8.29 |
| 2026-08-02 12:00 |
13:52:57.66 |
-38:39:59.4 |
HIP 67712 |
8.29 |
| 2026-08-03 00:00 |
13:52:58.10 |
-38:39:45.4 |
HIP 67712 |
8.29 |
| 2026-08-03 12:00 |
13:52:58.55 |
-38:39:31.5 |
HIP 67712 |
8.31 |
| 2026-08-04 00:00 |
13:52:59.03 |
-38:39:17.8 |
HIP 67712 |
8.35 |
| 2026-08-04 12:00 |
13:52:59.53 |
-38:39:04.2 |
HIP 67712 |
8.39 |
| 2026-08-05 00:00 |
13:53:00.06 |
-38:38:50.7 |
HIP 67712 |
8.45 |
| 2026-08-05 12:00 |
13:53:00.62 |
-38:38:37.3 |
HIP 67712 |
8.51 |
| 2026-08-06 00:00 |
13:53:01.19 |
-38:38:24.1 |
HIP 67712 |
8.59 |
| 2026-08-06 12:00 |
13:53:01.79 |
-38:38:11.0 |
HIP 67712 |
8.69 |
| 2026-08-07 00:00 |
13:53:02.42 |
-38:37:58.0 |
HIP 67712 |
8.79 |
| 2026-08-07 12:00 |
13:53:03.06 |
-38:37:45.2 |
HIP 67712 |
8.90 |
| 2026-08-08 00:00 |
13:53:03.74 |
-38:37:32.5 |
HIP 67712 |
9.02 |
| 2026-08-08 12:00 |
13:53:04.43 |
-38:37:19.9 |
HIP 67712 |
9.15 |
| 2026-08-09 00:00 |
13:53:05.15 |
-38:37:07.5 |
HIP 67712 |
9.30 |
| 2026-08-09 12:00 |
13:53:05.90 |
-38:36:55.2 |
HIP 67712 |
9.45 |
| 2026-08-10 00:00 |
13:53:06.66 |
-38:36:43.0 |
HIP 67712 |
9.61 |
| 2026-08-10 12:00 |
13:53:07.45 |
-38:36:31.0 |
HIP 67712 |
9.78 |
| 2026-08-11 00:00 |
13:53:08.27 |
-38:36:19.1 |
HIP 67712 |
9.95 |
| 2026-08-11 12:00 |
13:53:09.11 |
-38:36:07.4 |
HIP 67712 |
10.13 |
| 2026-08-12 00:00 |
13:53:09.97 |
-38:35:55.8 |
HIP 67712 |
10.33 |
| 2026-08-12 12:00 |
13:53:10.85 |
-38:35:44.3 |
HIP 67712 |
10.52 |
| 2026-08-13 00:00 |
13:53:11.76 |
-38:35:33.0 |
HIP 67712 |
10.73 |
| 2026-08-13 12:00 |
13:53:12.69 |
-38:35:21.8 |
HIP 67712 |
10.94 |
| 2026-08-14 00:00 |
13:53:13.65 |
-38:35:10.8 |
HIP 67712 |
11.16 |
| 2026-08-14 12:00 |
13:53:14.62 |
-38:34:59.9 |
HIP 67712 |
11.38 |
| 2026-08-15 00:00 |
13:53:15.62 |
-38:34:49.2 |
HIP 67712 |
11.61 |
| 2026-08-15 12:00 |
13:53:16.65 |
-38:34:38.6 |
HIP 67712 |
11.84 |
| 2026-08-16 00:00 |
13:53:17.69 |
-38:34:28.1 |
HIP 67712 |
12.08 |
| 2026-08-16 12:00 |
13:53:18.76 |
-38:34:17.8 |
HIP 67712 |
12.32 |
| 2026-08-17 00:00 |
13:53:19.85 |
-38:34:07.7 |
HIP 67712 |
12.57 |
| 2026-08-17 12:00 |
13:53:20.97 |
-38:33:57.7 |
HIP 67712 |
12.82 |
| 2026-08-18 00:00 |
13:53:22.10 |
-38:33:47.8 |
HIP 67795 |
12.90 |
| 2026-08-18 12:00 |
13:53:23.26 |
-38:33:38.1 |
HIP 67795 |
12.77 |
| 2026-08-19 00:00 |
13:53:24.44 |
-38:33:28.6 |
HIP 67795 |
12.65 |