メタデータ
| 項目 |
値 |
| Designation |
C/1998 M5 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-01-24T13:39:13.763520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:54Z |
| Obs used |
1238 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
5.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1998-11-27.0000000 |
| e |
0.99602466 |
| q (au) |
1.742289 |
| a (au) |
438.273933 |
| i (deg) |
82.228882 |
| Ω (om, deg) |
333.376703 |
| ω (w, deg) |
101.282943 |
| M (ma, deg) |
359.993709 |
等級
散乱 + 全体線形
$$
M_a = (4.498 + 5.665\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.498 |
| n |
5.665 |
| gf |
1.000 |
| gb |
-0.954 |
| k |
0.996 |
| 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) |
| 2026-05-12 00:00 |
07:54:59.14 |
-65:23:22.4 |
HIP 38815 |
16.93 |
| 2026-05-12 12:00 |
07:55:01.32 |
-65:22:50.7 |
HIP 38815 |
17.22 |
| 2026-05-13 00:00 |
07:55:03.54 |
-65:22:19.1 |
HIP 38815 |
17.52 |
| 2026-05-13 12:00 |
07:55:05.80 |
-65:21:47.6 |
HIP 38815 |
17.83 |
| 2026-05-14 00:00 |
07:55:08.10 |
-65:21:16.2 |
HIP 38815 |
18.15 |
| 2026-05-14 12:00 |
07:55:10.45 |
-65:20:45.0 |
HIP 38815 |
18.48 |
| 2026-05-15 00:00 |
07:55:12.84 |
-65:20:14.0 |
HIP 38815 |
18.81 |
| 2026-05-15 12:00 |
07:55:15.27 |
-65:19:43.0 |
HIP 38815 |
19.16 |
| 2026-05-16 00:00 |
07:55:17.74 |
-65:19:12.3 |
HIP 38815 |
19.51 |
| 2026-05-16 12:00 |
07:55:20.25 |
-65:18:41.7 |
HIP 38815 |
19.86 |
| 2026-05-17 00:00 |
07:55:22.80 |
-65:18:11.2 |
HIP 38411 |
20.15 |
| 2026-05-17 12:00 |
07:55:25.39 |
-65:17:40.9 |
HIP 38411 |
20.41 |
| 2026-05-18 00:00 |
07:55:28.03 |
-65:17:10.7 |
HIP 38411 |
20.69 |
| 2026-05-18 12:00 |
07:55:30.70 |
-65:16:40.7 |
HIP 38411 |
20.99 |
| 2026-05-19 00:00 |
07:55:33.41 |
-65:16:10.9 |
HIP 38411 |
21.30 |
| 2026-05-19 12:00 |
07:55:36.16 |
-65:15:41.2 |
HIP 38605 |
21.04 |
| 2026-05-20 00:00 |
07:55:38.95 |
-65:15:11.7 |
HIP 38605 |
20.72 |
| 2026-05-20 12:00 |
07:55:41.78 |
-65:14:42.3 |
HIP 38605 |
20.41 |
| 2026-05-21 00:00 |
07:55:44.65 |
-65:14:13.2 |
HIP 38605 |
20.12 |
| 2026-05-21 12:00 |
07:55:47.56 |
-65:13:44.2 |
HIP 38605 |
19.85 |
| 2026-05-22 00:00 |
07:55:50.50 |
-65:13:15.3 |
HIP 38605 |
19.59 |
| 2026-05-22 12:00 |
07:55:53.48 |
-65:12:46.7 |
HIP 38605 |
19.35 |
| 2026-05-23 00:00 |
07:55:56.50 |
-65:12:18.2 |
HIP 38605 |
19.13 |
| 2026-05-23 12:00 |
07:55:59.56 |
-65:11:49.9 |
HIP 38605 |
18.93 |
| 2026-05-24 00:00 |
07:56:02.65 |
-65:11:21.8 |
HIP 38605 |
18.75 |
| 2026-05-24 12:00 |
07:56:05.78 |
-65:10:53.8 |
HIP 38605 |
18.59 |
| 2026-05-25 00:00 |
07:56:08.95 |
-65:10:26.1 |
HIP 38605 |
18.46 |
| 2026-05-25 12:00 |
07:56:12.15 |
-65:09:58.5 |
HIP 38605 |
18.34 |
| 2026-05-26 00:00 |
07:56:15.39 |
-65:09:31.1 |
HIP 38605 |
18.24 |
| 2026-05-26 12:00 |
07:56:18.66 |
-65:09:03.9 |
HIP 38605 |
18.17 |
| 2026-05-27 00:00 |
07:56:21.97 |
-65:08:36.9 |
HIP 38605 |
18.12 |
| 2026-05-27 12:00 |
07:56:25.31 |
-65:08:10.1 |
HIP 38605 |
18.10 |
| 2026-05-28 00:00 |
07:56:28.69 |
-65:07:43.5 |
HIP 38605 |
18.09 |
| 2026-05-28 12:00 |
07:56:32.10 |
-65:07:17.1 |
HIP 38605 |
18.11 |
| 2026-05-29 00:00 |
07:56:35.55 |
-65:06:50.9 |
HIP 38605 |
18.15 |
| 2026-05-29 12:00 |
07:56:39.03 |
-65:06:24.8 |
HIP 38605 |
18.22 |
| 2026-05-30 00:00 |
07:56:42.54 |
-65:05:59.0 |
HIP 38605 |
18.31 |
| 2026-05-30 12:00 |
07:56:46.09 |
-65:05:33.4 |
HIP 38605 |
18.42 |
| 2026-05-31 00:00 |
07:56:49.66 |
-65:05:08.0 |
HIP 38605 |
18.55 |
| 2026-05-31 12:00 |
07:56:53.28 |
-65:04:42.8 |
HIP 38605 |
18.70 |
| 2026-06-01 00:00 |
07:56:56.92 |
-65:04:17.7 |
HIP 38605 |
18.87 |
| 2026-06-01 12:00 |
07:57:00.60 |
-65:03:52.9 |
HIP 38605 |
19.06 |
| 2026-06-02 00:00 |
07:57:04.31 |
-65:03:28.3 |
HIP 38605 |
19.27 |