メタデータ
| 項目 |
値 |
| Designation |
496P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-03-11T10:59:53.473920Z |
| Orbit solution date (soln_date, UTC) |
2025-09-30T13:39:54Z |
| Obs used |
1688 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
20.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-09-26T14:11:19.680000Z |
| Discovery magnitude (MPC) |
20.22 G |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-09-12.0000000 |
| e |
0.73348756 |
| q (au) |
1.620113 |
| a (au) |
6.078939 |
| i (deg) |
14.831238 |
| Ω (om, deg) |
63.817654 |
| ω (w, deg) |
42.159614 |
| M (ma, deg) |
276.059995 |
等級
散乱 + 全体線形
$$
M_a = (11.592 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.592 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2024-09-11 |
2024-11-06 |
+18.6955 |
-6.087 |
| 2024-11-06 |
2024-12-27 |
-5.6666 |
+2.049 |
| 2024-12-27 |
2025-03-11 |
+13.4429 |
-2.871 |
| 2025-03-14 |
2025-06-28 |
-8.8446 |
+1.243 |
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 |
14:37:04.46 |
-09:29:16.9 |
HIP 71417 |
13.66 |
| 2026-06-01 12:00 |
14:36:48.65 |
-09:29:15.8 |
HIP 71417 |
10.63 |
| 2026-06-02 00:00 |
14:36:33.03 |
-09:29:15.6 |
HIP 71417 |
8.35 |
| 2026-06-02 12:00 |
14:36:17.60 |
-09:29:16.4 |
HIP 71417 |
7.48 |
| 2026-06-03 00:00 |
14:36:02.37 |
-09:29:18.1 |
HIP 71417 |
8.39 |
| 2026-06-03 12:00 |
14:35:47.33 |
-09:29:20.7 |
HIP 71417 |
10.59 |
| 2026-06-04 00:00 |
14:35:32.48 |
-09:29:24.3 |
HIP 71323 |
12.59 |
| 2026-06-04 12:00 |
14:35:17.84 |
-09:29:28.8 |
HIP 71323 |
11.31 |
| 2026-06-05 00:00 |
14:35:03.39 |
-09:29:34.2 |
HIP 71323 |
11.12 |
| 2026-06-05 12:00 |
14:34:49.14 |
-09:29:40.6 |
HIP 71323 |
12.03 |
| 2026-06-06 00:00 |
14:34:35.10 |
-09:29:48.0 |
HIP 71323 |
13.79 |
| 2026-06-06 12:00 |
14:34:21.25 |
-09:29:56.3 |
HIP 71323 |
16.08 |
| 2026-06-07 00:00 |
14:34:07.61 |
-09:30:05.6 |
HIP 71323 |
18.70 |
| 2026-06-07 12:00 |
14:33:54.18 |
-09:30:15.8 |
HIP 71323 |
21.49 |
| 2026-06-08 00:00 |
14:33:40.94 |
-09:30:27.0 |
HIP 71118 |
22.21 |
| 2026-06-08 12:00 |
14:33:27.92 |
-09:30:39.1 |
HIP 71118 |
19.81 |
| 2026-06-09 00:00 |
14:33:15.10 |
-09:30:52.2 |
HIP 71118 |
17.68 |
| 2026-06-09 12:00 |
14:33:02.49 |
-09:31:06.3 |
HIP 71118 |
15.91 |
| 2026-06-10 00:00 |
14:32:50.09 |
-09:31:21.4 |
HIP 71118 |
14.59 |
| 2026-06-10 12:00 |
14:32:37.91 |
-09:31:37.3 |
HIP 71118 |
13.83 |
| 2026-06-11 00:00 |
14:32:25.93 |
-09:31:54.3 |
HIP 71118 |
13.67 |
| 2026-06-11 12:00 |
14:32:14.16 |
-09:32:12.2 |
HIP 71118 |
14.12 |
| 2026-06-12 00:00 |
14:32:02.61 |
-09:32:31.2 |
HIP 71118 |
15.09 |
| 2026-06-12 12:00 |
14:31:51.27 |
-09:32:51.0 |
HIP 71118 |
16.45 |
| 2026-06-13 00:00 |
14:31:40.15 |
-09:33:11.9 |
HIP 71118 |
18.11 |
| 2026-06-13 12:00 |
14:31:29.24 |
-09:33:33.7 |
HIP 71118 |
19.95 |
| 2026-06-14 00:00 |
14:31:18.55 |
-09:33:56.5 |
HIP 71118 |
21.93 |
| 2026-06-14 12:00 |
14:31:08.08 |
-09:34:20.2 |
HIP 71118 |
23.98 |
| 2026-06-15 00:00 |
14:30:57.82 |
-09:34:44.9 |
HIP 71118 |
26.07 |
| 2026-06-15 12:00 |
14:30:47.78 |
-09:35:10.6 |
HIP 71118 |
28.19 |
| 2026-06-16 00:00 |
14:30:37.96 |
-09:35:37.3 |
HIP 71118 |
30.31 |
| 2026-06-16 12:00 |
14:30:28.36 |
-09:36:04.9 |
HIP 71118 |
32.42 |
| 2026-06-17 00:00 |
14:30:18.98 |
-09:36:33.5 |
HIP 71118 |
34.52 |
| 2026-06-17 12:00 |
14:30:09.82 |
-09:37:03.1 |
HIP 70784 |
33.45 |
| 2026-06-18 00:00 |
14:30:00.87 |
-09:37:33.6 |
HIP 70784 |
31.53 |
| 2026-06-18 12:00 |
14:29:52.15 |
-09:38:05.1 |
HIP 70784 |
29.69 |
| 2026-06-19 00:00 |
14:29:43.65 |
-09:38:37.5 |
HIP 70784 |
27.92 |
| 2026-06-19 12:00 |
14:29:35.37 |
-09:39:10.9 |
HIP 70784 |
26.23 |
| 2026-06-20 00:00 |
14:29:27.31 |
-09:39:45.3 |
HIP 70784 |
24.62 |
| 2026-06-20 12:00 |
14:29:19.47 |
-09:40:20.6 |
HIP 70784 |
23.09 |
| 2026-06-21 00:00 |
14:29:11.86 |
-09:40:56.8 |
HIP 70784 |
21.66 |
| 2026-06-21 12:00 |
14:29:04.46 |
-09:41:34.0 |
HIP 70784 |
20.33 |
| 2026-06-22 00:00 |
14:28:57.28 |
-09:42:12.1 |
HIP 70784 |
19.10 |