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 |
0.977 |
| gb |
-0.608 |
| k |
0.800 |
| δ90 |
1.735 |
| 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 |
-7.0398 |
+2.913 |
| 2020-11-05 |
2021-01-24 |
+19.2514 |
-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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
22:16:40.97 |
-11:29:57.0 |
HIP 109998 |
9.06 |
| 2026-06-03 00:00 |
22:16:41.24 |
-11:30:08.4 |
HIP 109998 |
8.86 |
| 2026-06-03 12:00 |
22:16:41.41 |
-11:30:20.4 |
HIP 109998 |
8.66 |
| 2026-06-04 00:00 |
22:16:41.48 |
-11:30:32.9 |
HIP 109998 |
8.45 |
| 2026-06-04 12:00 |
22:16:41.46 |
-11:30:46.0 |
HIP 109998 |
8.23 |
| 2026-06-05 00:00 |
22:16:41.34 |
-11:30:59.7 |
HIP 109998 |
8.01 |
| 2026-06-05 12:00 |
22:16:41.12 |
-11:31:13.9 |
HIP 109998 |
7.78 |
| 2026-06-06 00:00 |
22:16:40.81 |
-11:31:28.7 |
HIP 109998 |
7.55 |
| 2026-06-06 12:00 |
22:16:40.40 |
-11:31:44.0 |
HIP 109998 |
7.31 |
| 2026-06-07 00:00 |
22:16:39.89 |
-11:32:00.0 |
HIP 109998 |
7.07 |
| 2026-06-07 12:00 |
22:16:39.28 |
-11:32:16.4 |
HIP 109998 |
6.83 |
| 2026-06-08 00:00 |
22:16:38.58 |
-11:32:33.5 |
HIP 109998 |
6.60 |
| 2026-06-08 12:00 |
22:16:37.78 |
-11:32:51.1 |
HIP 109998 |
6.37 |
| 2026-06-09 00:00 |
22:16:36.88 |
-11:33:09.2 |
HIP 109998 |
6.15 |
| 2026-06-09 12:00 |
22:16:35.88 |
-11:33:28.0 |
HIP 109998 |
5.95 |
| 2026-06-10 00:00 |
22:16:34.79 |
-11:33:47.3 |
HIP 109998 |
5.77 |
| 2026-06-10 12:00 |
22:16:33.59 |
-11:34:07.1 |
HIP 109998 |
5.62 |
| 2026-06-11 00:00 |
22:16:32.30 |
-11:34:27.6 |
HIP 109998 |
5.51 |
| 2026-06-11 12:00 |
22:16:30.92 |
-11:34:48.6 |
HIP 109998 |
5.44 |
| 2026-06-12 00:00 |
22:16:29.43 |
-11:35:10.1 |
HIP 109998 |
5.43 |
| 2026-06-12 12:00 |
22:16:27.85 |
-11:35:32.2 |
HIP 109998 |
5.48 |
| 2026-06-13 00:00 |
22:16:26.17 |
-11:35:54.9 |
HIP 109998 |
5.60 |
| 2026-06-13 12:00 |
22:16:24.39 |
-11:36:18.2 |
HIP 109998 |
5.78 |
| 2026-06-14 00:00 |
22:16:22.51 |
-11:36:42.0 |
HIP 109998 |
6.03 |
| 2026-06-14 12:00 |
22:16:20.53 |
-11:37:06.3 |
HIP 109998 |
6.36 |
| 2026-06-15 00:00 |
22:16:18.46 |
-11:37:31.3 |
HIP 109998 |
6.74 |
| 2026-06-15 12:00 |
22:16:16.29 |
-11:37:56.7 |
HIP 109998 |
7.19 |
| 2026-06-16 00:00 |
22:16:14.03 |
-11:38:22.8 |
HIP 109998 |
7.70 |
| 2026-06-16 12:00 |
22:16:11.66 |
-11:38:49.4 |
HIP 109998 |
8.26 |
| 2026-06-17 00:00 |
22:16:09.20 |
-11:39:16.5 |
HIP 109998 |
8.87 |
| 2026-06-17 12:00 |
22:16:06.64 |
-11:39:44.2 |
HIP 109998 |
9.52 |
| 2026-06-18 00:00 |
22:16:03.99 |
-11:40:12.5 |
HIP 109998 |
10.22 |
| 2026-06-18 12:00 |
22:16:01.24 |
-11:40:41.3 |
HIP 109998 |
10.95 |
| 2026-06-19 00:00 |
22:15:58.39 |
-11:41:10.6 |
HIP 109998 |
11.72 |
| 2026-06-19 12:00 |
22:15:55.45 |
-11:41:40.5 |
HIP 109998 |
12.53 |
| 2026-06-20 00:00 |
22:15:52.41 |
-11:42:10.9 |
HIP 109998 |
13.37 |
| 2026-06-20 12:00 |
22:15:49.28 |
-11:42:41.9 |
HIP 109998 |
14.24 |
| 2026-06-21 00:00 |
22:15:46.05 |
-11:43:13.4 |
HIP 109998 |
15.15 |
| 2026-06-21 12:00 |
22:15:42.73 |
-11:43:45.5 |
HIP 109998 |
16.08 |
| 2026-06-22 00:00 |
22:15:39.31 |
-11:44:18.1 |
HIP 109998 |
17.04 |