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) |
| 2026-07-29 00:00 |
14:29:43.04 |
-11:07:13.3 |
HIP 70797 |
15.07 |
| 2026-07-29 12:00 |
14:29:50.77 |
-11:08:48.1 |
HIP 70797 |
16.72 |
| 2026-07-30 00:00 |
14:29:58.67 |
-11:10:23.5 |
HIP 70797 |
18.59 |
| 2026-07-30 12:00 |
14:30:06.73 |
-11:11:59.4 |
HIP 70797 |
20.63 |
| 2026-07-31 00:00 |
14:30:14.96 |
-11:13:35.8 |
HIP 70797 |
22.82 |
| 2026-07-31 12:00 |
14:30:23.35 |
-11:15:12.7 |
HIP 70797 |
25.12 |
| 2026-08-01 00:00 |
14:30:31.91 |
-11:16:50.2 |
HIP 70797 |
27.52 |
| 2026-08-01 12:00 |
14:30:40.62 |
-11:18:28.1 |
HIP 70797 |
30.00 |
| 2026-08-02 00:00 |
14:30:49.50 |
-11:20:06.6 |
HIP 71083 |
31.38 |
| 2026-08-02 12:00 |
14:30:58.53 |
-11:21:45.6 |
HIP 71005 |
30.84 |
| 2026-08-03 00:00 |
14:31:07.72 |
-11:23:25.1 |
HIP 71005 |
28.91 |
| 2026-08-03 12:00 |
14:31:17.07 |
-11:25:05.0 |
HIP 71005 |
27.13 |
| 2026-08-04 00:00 |
14:31:26.58 |
-11:26:45.5 |
HIP 71005 |
25.53 |
| 2026-08-04 12:00 |
14:31:36.25 |
-11:28:26.4 |
HIP 71005 |
24.16 |
| 2026-08-05 00:00 |
14:31:46.06 |
-11:30:07.8 |
HIP 71005 |
23.08 |
| 2026-08-05 12:00 |
14:31:56.04 |
-11:31:49.7 |
HIP 71120 |
21.73 |
| 2026-08-06 00:00 |
14:32:06.16 |
-11:33:32.1 |
HIP 71120 |
19.12 |
| 2026-08-06 12:00 |
14:32:16.44 |
-11:35:14.9 |
HIP 71120 |
16.62 |
| 2026-08-07 00:00 |
14:32:26.87 |
-11:36:58.1 |
HIP 71120 |
14.32 |
| 2026-08-07 12:00 |
14:32:37.45 |
-11:38:41.8 |
HIP 71120 |
12.37 |
| 2026-08-08 00:00 |
14:32:48.19 |
-11:40:26.0 |
HIP 71120 |
10.96 |
| 2026-08-08 12:00 |
14:32:59.07 |
-11:42:10.6 |
HIP 71120 |
10.36 |
| 2026-08-09 00:00 |
14:33:10.10 |
-11:43:55.6 |
HIP 71120 |
10.74 |
| 2026-08-09 12:00 |
14:33:21.27 |
-11:45:41.1 |
HIP 71120 |
12.02 |
| 2026-08-10 00:00 |
14:33:32.60 |
-11:47:27.0 |
HIP 71120 |
14.00 |
| 2026-08-10 12:00 |
14:33:44.07 |
-11:49:13.3 |
HIP 71120 |
16.43 |
| 2026-08-11 00:00 |
14:33:55.68 |
-11:51:00.0 |
HIP 71120 |
19.17 |
| 2026-08-11 12:00 |
14:34:07.44 |
-11:52:47.2 |
HIP 71340 |
19.74 |
| 2026-08-12 00:00 |
14:34:19.34 |
-11:54:34.7 |
HIP 71340 |
18.02 |
| 2026-08-12 12:00 |
14:34:31.39 |
-11:56:22.7 |
HIP 71340 |
16.81 |
| 2026-08-13 00:00 |
14:34:43.57 |
-11:58:11.0 |
HIP 71340 |
16.24 |
| 2026-08-13 12:00 |
14:34:55.90 |
-11:59:59.7 |
HIP 71340 |
16.40 |
| 2026-08-14 00:00 |
14:35:08.36 |
-12:01:48.8 |
HIP 71340 |
17.29 |
| 2026-08-14 12:00 |
14:35:20.97 |
-12:03:38.2 |
HIP 71340 |
18.83 |
| 2026-08-15 00:00 |
14:35:33.71 |
-12:05:28.1 |
HIP 71340 |
20.88 |
| 2026-08-15 12:00 |
14:35:46.58 |
-12:07:18.2 |
HIP 71469 |
21.14 |
| 2026-08-16 00:00 |
14:35:59.60 |
-12:09:08.8 |
HIP 71469 |
17.47 |
| 2026-08-16 12:00 |
14:36:12.74 |
-12:10:59.7 |
HIP 71469 |
13.76 |
| 2026-08-17 00:00 |
14:36:26.02 |
-12:12:50.9 |
HIP 71469 |
10.03 |
| 2026-08-17 12:00 |
14:36:39.43 |
-12:14:42.4 |
HIP 71469 |
6.28 |
| 2026-08-18 00:00 |
14:36:52.97 |
-12:16:34.3 |
HIP 71469 |
2.54 |
| 2026-08-18 12:00 |
14:37:06.65 |
-12:18:26.5 |
HIP 71469 |
1.55 |
| 2026-08-19 00:00 |
14:37:20.45 |
-12:20:19.1 |
HIP 71469 |
5.29 |