メタデータ
| 項目 |
値 |
| Designation |
409P/LONEOS-Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-01-25T16:59:38.414400Z |
| Orbit solution date (soln_date, UTC) |
2022-03-08T19:44:12Z |
| Obs used |
1705 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
8.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-11-03T11:40:07.680000Z |
| Discovery magnitude (MPC) |
19.56 g |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-06-28.0000000 |
| e |
0.71072113 |
| q (au) |
1.751020 |
| a (au) |
6.053052 |
| i (deg) |
17.144587 |
| Ω (om, deg) |
143.781749 |
| ω (w, deg) |
15.044814 |
| M (ma, deg) |
200.916834 |
等級
散乱 + 全体線形
$$
M_a = (14.371 + 4.559\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.371 |
| n |
4.559 |
| gf |
1.000 |
| gb |
-0.608 |
| k |
0.800 |
| δ90 |
1.739 |
| 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 |
| 2019-10-24 |
2020-11-05 |
-7.0401 |
+2.913 |
| 2020-11-05 |
2021-01-24 |
+19.2516 |
-4.902 |
| 2021-01-26 |
2021-07-05 |
+4.7721 |
-1.442 |
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) |
| 2026-05-12 00:00 |
22:14:59.78 |
-11:30:27.8 |
HIP 109762 |
16.51 |
| 2026-05-12 12:00 |
22:15:04.07 |
-11:30:15.8 |
HIP 109762 |
17.57 |
| 2026-05-13 00:00 |
22:15:08.28 |
-11:30:04.3 |
HIP 109762 |
18.61 |
| 2026-05-13 12:00 |
22:15:12.39 |
-11:29:53.3 |
HIP 109762 |
19.63 |
| 2026-05-14 00:00 |
22:15:16.42 |
-11:29:42.9 |
HIP 109762 |
20.63 |
| 2026-05-14 12:00 |
22:15:20.35 |
-11:29:33.0 |
HIP 109762 |
21.60 |
| 2026-05-15 00:00 |
22:15:24.20 |
-11:29:23.6 |
HIP 109998 |
22.06 |
| 2026-05-15 12:00 |
22:15:27.95 |
-11:29:14.7 |
HIP 109998 |
21.30 |
| 2026-05-16 00:00 |
22:15:31.61 |
-11:29:06.3 |
HIP 109998 |
20.57 |
| 2026-05-16 12:00 |
22:15:35.18 |
-11:28:58.5 |
HIP 109998 |
19.87 |
| 2026-05-17 00:00 |
22:15:38.67 |
-11:28:51.2 |
HIP 109998 |
19.20 |
| 2026-05-17 12:00 |
22:15:42.05 |
-11:28:44.5 |
HIP 109998 |
18.56 |
| 2026-05-18 00:00 |
22:15:45.35 |
-11:28:38.3 |
HIP 109998 |
17.95 |
| 2026-05-18 12:00 |
22:15:48.56 |
-11:28:32.6 |
HIP 109998 |
17.37 |
| 2026-05-19 00:00 |
22:15:51.67 |
-11:28:27.4 |
HIP 109998 |
16.82 |
| 2026-05-19 12:00 |
22:15:54.69 |
-11:28:22.8 |
HIP 109998 |
16.30 |
| 2026-05-20 00:00 |
22:15:57.61 |
-11:28:18.8 |
HIP 109998 |
15.81 |
| 2026-05-20 12:00 |
22:16:00.45 |
-11:28:15.3 |
HIP 109998 |
15.34 |
| 2026-05-21 00:00 |
22:16:03.19 |
-11:28:12.3 |
HIP 109998 |
14.90 |
| 2026-05-21 12:00 |
22:16:05.83 |
-11:28:09.9 |
HIP 109998 |
14.49 |
| 2026-05-22 00:00 |
22:16:08.39 |
-11:28:08.0 |
HIP 109998 |
14.10 |
| 2026-05-22 12:00 |
22:16:10.85 |
-11:28:06.7 |
HIP 109998 |
13.74 |
| 2026-05-23 00:00 |
22:16:13.21 |
-11:28:05.9 |
HIP 109998 |
13.40 |
| 2026-05-23 12:00 |
22:16:15.48 |
-11:28:05.7 |
HIP 109998 |
13.09 |
| 2026-05-24 00:00 |
22:16:17.66 |
-11:28:06.0 |
HIP 109998 |
12.79 |
| 2026-05-24 12:00 |
22:16:19.74 |
-11:28:06.8 |
HIP 109998 |
12.52 |
| 2026-05-25 00:00 |
22:16:21.73 |
-11:28:08.2 |
HIP 109998 |
12.26 |
| 2026-05-25 12:00 |
22:16:23.63 |
-11:28:10.2 |
HIP 109998 |
12.02 |
| 2026-05-26 00:00 |
22:16:25.43 |
-11:28:12.7 |
HIP 109998 |
11.79 |
| 2026-05-26 12:00 |
22:16:27.13 |
-11:28:15.8 |
HIP 109998 |
11.58 |
| 2026-05-27 00:00 |
22:16:28.74 |
-11:28:19.4 |
HIP 109998 |
11.37 |
| 2026-05-27 12:00 |
22:16:30.25 |
-11:28:23.6 |
HIP 109998 |
11.18 |
| 2026-05-28 00:00 |
22:16:31.67 |
-11:28:28.3 |
HIP 109998 |
10.99 |
| 2026-05-28 12:00 |
22:16:33.00 |
-11:28:33.6 |
HIP 109998 |
10.82 |
| 2026-05-29 00:00 |
22:16:34.23 |
-11:28:39.4 |
HIP 109998 |
10.64 |
| 2026-05-29 12:00 |
22:16:35.36 |
-11:28:45.8 |
HIP 109998 |
10.47 |
| 2026-05-30 00:00 |
22:16:36.40 |
-11:28:52.7 |
HIP 109998 |
10.30 |
| 2026-05-30 12:00 |
22:16:37.34 |
-11:29:00.2 |
HIP 109998 |
10.13 |
| 2026-05-31 00:00 |
22:16:38.18 |
-11:29:08.3 |
HIP 109998 |
9.96 |
| 2026-05-31 12:00 |
22:16:38.93 |
-11:29:16.9 |
HIP 109998 |
9.79 |
| 2026-06-01 00:00 |
22:16:39.59 |
-11:29:26.1 |
HIP 109998 |
9.61 |
| 2026-06-01 12:00 |
22:16:40.14 |
-11:29:35.8 |
HIP 109998 |
9.43 |
| 2026-06-02 00:00 |
22:16:40.60 |
-11:29:46.1 |
HIP 109998 |
9.25 |