メタデータ
| 項目 |
値 |
| Designation |
498P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-12-19T02:34:38.876160Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T14:45:22Z |
| Obs used |
368 |
| NEO |
- |
| M1 |
6.200 |
| K1 |
40.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2015-02-13T02:33:34.560000Z |
| Discovery magnitude (MPC) |
19.90 r |
| Discovery observatory (MPC) |
G45 · Space Surveillance Telescope, Atom Site |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-02-04.0000000 |
| e |
0.57239000 |
| q (au) |
1.963512 |
| a (au) |
4.591829 |
| i (deg) |
14.479162 |
| Ω (om, deg) |
279.253586 |
| ω (w, deg) |
179.143815 |
| M (ma, deg) |
328.035909 |
等級
散乱 + 全体線形
$$
M_a = (18.691 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.691 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.685 |
| k |
0.800 |
| 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 |
14:17:33.16 |
-31:21:10.5 |
HIP 69863 |
19.56 |
| 2026-03-26 12:00 |
14:17:15.46 |
-31:20:44.4 |
HIP 69863 |
20.16 |
| 2026-03-27 00:00 |
14:16:57.57 |
-31:20:16.1 |
HIP 69863 |
21.42 |
| 2026-03-27 12:00 |
14:16:39.48 |
-31:19:45.7 |
HIP 69771 |
22.27 |
| 2026-03-28 00:00 |
14:16:21.21 |
-31:19:13.2 |
HIP 69771 |
22.26 |
| 2026-03-28 12:00 |
14:16:02.75 |
-31:18:38.5 |
HIP 69771 |
22.91 |
| 2026-03-29 00:00 |
14:15:44.11 |
-31:18:01.7 |
HIP 69599 |
19.86 |
| 2026-03-29 12:00 |
14:15:25.29 |
-31:17:22.7 |
HIP 69599 |
16.93 |
| 2026-03-30 00:00 |
14:15:06.30 |
-31:16:41.6 |
HIP 69599 |
14.52 |
| 2026-03-30 12:00 |
14:14:47.14 |
-31:15:58.4 |
HIP 69599 |
12.96 |
| 2026-03-31 00:00 |
14:14:27.82 |
-31:15:13.0 |
HIP 69599 |
12.62 |
| 2026-03-31 12:00 |
14:14:08.33 |
-31:14:25.5 |
HIP 69599 |
13.62 |
| 2026-04-01 00:00 |
14:13:48.69 |
-31:13:35.9 |
HIP 69441 |
10.28 |
| 2026-04-01 12:00 |
14:13:28.89 |
-31:12:44.1 |
HIP 69441 |
6.23 |
| 2026-04-02 00:00 |
14:13:08.94 |
-31:11:50.2 |
HIP 69441 |
3.06 |
| 2026-04-02 12:00 |
14:12:48.84 |
-31:10:54.2 |
HIP 69441 |
4.27 |
| 2026-04-03 00:00 |
14:12:28.60 |
-31:09:56.0 |
HIP 69441 |
8.16 |
| 2026-04-03 12:00 |
14:12:08.23 |
-31:08:55.7 |
HIP 69441 |
12.46 |
| 2026-04-04 00:00 |
14:11:47.72 |
-31:07:53.4 |
HIP 69285 |
14.34 |
| 2026-04-04 12:00 |
14:11:27.08 |
-31:06:48.9 |
HIP 69285 |
12.34 |
| 2026-04-05 00:00 |
14:11:06.31 |
-31:05:42.2 |
HIP 69285 |
11.88 |
| 2026-04-05 12:00 |
14:10:45.42 |
-31:04:33.5 |
HIP 69285 |
13.14 |
| 2026-04-06 00:00 |
14:10:24.41 |
-31:03:22.7 |
HIP 69163 |
14.37 |
| 2026-04-06 12:00 |
14:10:03.29 |
-31:02:09.8 |
HIP 69163 |
9.98 |
| 2026-04-07 00:00 |
14:09:42.06 |
-31:00:54.9 |
HIP 69163 |
6.00 |
| 2026-04-07 12:00 |
14:09:20.72 |
-30:59:37.8 |
HIP 69163 |
4.11 |
| 2026-04-08 00:00 |
14:08:59.29 |
-30:58:18.7 |
HIP 69163 |
6.55 |
| 2026-04-08 12:00 |
14:08:37.76 |
-30:56:57.6 |
HIP 69163 |
10.73 |
| 2026-04-09 00:00 |
14:08:16.13 |
-30:55:34.3 |
HIP 69163 |
15.30 |
| 2026-04-09 12:00 |
14:07:54.42 |
-30:54:09.1 |
HIP 69163 |
20.03 |
| 2026-04-10 00:00 |
14:07:32.62 |
-30:52:41.8 |
HIP 69163 |
24.83 |
| 2026-04-10 12:00 |
14:07:10.75 |
-30:51:12.5 |
HIP 68840 |
24.18 |
| 2026-04-11 00:00 |
14:06:48.80 |
-30:49:41.3 |
HIP 68840 |
19.70 |
| 2026-04-11 12:00 |
14:06:26.79 |
-30:48:08.0 |
HIP 68840 |
15.46 |
| 2026-04-12 00:00 |
14:06:04.71 |
-30:46:32.7 |
HIP 68840 |
11.79 |
| 2026-04-12 12:00 |
14:05:42.57 |
-30:44:55.5 |
HIP 68840 |
9.40 |
| 2026-04-13 00:00 |
14:05:20.37 |
-30:43:16.3 |
HIP 68840 |
9.37 |
| 2026-04-13 12:00 |
14:04:58.12 |
-30:41:35.3 |
HIP 68840 |
11.76 |
| 2026-04-14 00:00 |
14:04:35.83 |
-30:39:52.2 |
HIP 68681 |
14.40 |
| 2026-04-14 12:00 |
14:04:13.50 |
-30:38:07.3 |
HIP 68681 |
9.31 |
| 2026-04-15 00:00 |
14:03:51.13 |
-30:36:20.5 |
HIP 68681 |
4.25 |
| 2026-04-15 12:00 |
14:03:28.73 |
-30:34:31.8 |
HIP 68681 |
1.47 |
| 2026-04-16 00:00 |
14:03:06.30 |
-30:32:41.3 |
HIP 68681 |
6.29 |