メタデータ
| 項目 |
値 |
| Designation |
119P/Parker-Hartley |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-04-03T23:02:16.448640Z |
| Orbit solution date (soln_date, UTC) |
2024-09-01T19:42:26Z |
| Obs used |
3237 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
13.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-08-20.0000000 |
| e |
0.29594027 |
| q (au) |
3.023931 |
| a (au) |
4.294992 |
| i (deg) |
5.183509 |
| Ω (om, deg) |
243.678154 |
| ω (w, deg) |
181.859700 |
| M (ma, deg) |
55.701021 |
等級
散乱 + 全体線形
$$
M_a = (8.651 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.651 |
| n |
6.000 |
| gf |
0.801 |
| gb |
-0.500 |
| k |
0.964 |
| δ90 |
1.000 |
| 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 |
| 2021-05-28 |
2021-10-23 |
+0.9742 |
-0.715 |
| 2021-10-23 |
2024-05-06 |
-1.5544 |
+0.897 |
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) |
| 2026-03-26 00:00 |
16:57:16.17 |
-17:27:51.6 |
HIP 82956 |
21.37 |
| 2026-03-26 12:00 |
16:57:16.30 |
-17:27:34.9 |
HIP 82956 |
21.65 |
| 2026-03-27 00:00 |
16:57:16.21 |
-17:27:17.9 |
HIP 82956 |
21.93 |
| 2026-03-27 12:00 |
16:57:15.93 |
-17:27:00.7 |
HIP 82956 |
22.21 |
| 2026-03-28 00:00 |
16:57:15.43 |
-17:26:43.2 |
HIP 82956 |
22.49 |
| 2026-03-28 12:00 |
16:57:14.74 |
-17:26:25.5 |
HIP 82956 |
22.78 |
| 2026-03-29 00:00 |
16:57:13.84 |
-17:26:07.5 |
HIP 82956 |
23.06 |
| 2026-03-29 12:00 |
16:57:12.73 |
-17:25:49.2 |
HIP 82956 |
23.35 |
| 2026-03-30 00:00 |
16:57:11.42 |
-17:25:30.7 |
HIP 82956 |
23.65 |
| 2026-03-30 12:00 |
16:57:09.91 |
-17:25:12.0 |
HIP 82956 |
23.95 |
| 2026-03-31 00:00 |
16:57:08.19 |
-17:24:52.9 |
HIP 82956 |
24.27 |
| 2026-03-31 12:00 |
16:57:06.26 |
-17:24:33.7 |
HIP 82956 |
24.59 |
| 2026-04-01 00:00 |
16:57:04.13 |
-17:24:14.2 |
HIP 82956 |
24.93 |
| 2026-04-01 12:00 |
16:57:01.80 |
-17:23:54.4 |
HIP 82956 |
25.29 |
| 2026-04-02 00:00 |
16:56:59.26 |
-17:23:34.4 |
HIP 82956 |
25.66 |
| 2026-04-02 12:00 |
16:56:56.52 |
-17:23:14.2 |
HIP 82956 |
26.06 |
| 2026-04-03 00:00 |
16:56:53.57 |
-17:22:53.7 |
HIP 82956 |
26.48 |
| 2026-04-03 12:00 |
16:56:50.41 |
-17:22:33.0 |
HIP 82956 |
26.93 |
| 2026-04-04 00:00 |
16:56:47.05 |
-17:22:12.1 |
HIP 82956 |
27.41 |
| 2026-04-04 12:00 |
16:56:43.49 |
-17:21:50.9 |
HIP 82956 |
27.93 |
| 2026-04-05 00:00 |
16:56:39.72 |
-17:21:29.5 |
HIP 82956 |
28.48 |
| 2026-04-05 12:00 |
16:56:35.74 |
-17:21:07.9 |
HIP 82956 |
29.06 |
| 2026-04-06 00:00 |
16:56:31.56 |
-17:20:46.0 |
HIP 82956 |
29.69 |
| 2026-04-06 12:00 |
16:56:27.18 |
-17:20:24.0 |
HIP 82956 |
30.36 |
| 2026-04-07 00:00 |
16:56:22.59 |
-17:20:01.7 |
HIP 82956 |
31.08 |
| 2026-04-07 12:00 |
16:56:17.80 |
-17:19:39.2 |
HIP 82861 |
31.51 |
| 2026-04-08 00:00 |
16:56:12.80 |
-17:19:16.4 |
HIP 82861 |
31.01 |
| 2026-04-08 12:00 |
16:56:07.60 |
-17:18:53.5 |
HIP 82861 |
30.54 |
| 2026-04-09 00:00 |
16:56:02.20 |
-17:18:30.4 |
HIP 82861 |
30.13 |
| 2026-04-09 12:00 |
16:55:56.59 |
-17:18:07.0 |
HIP 82861 |
29.76 |
| 2026-04-10 00:00 |
16:55:50.78 |
-17:17:43.4 |
HIP 82861 |
29.46 |
| 2026-04-10 12:00 |
16:55:44.77 |
-17:17:19.7 |
HIP 82861 |
29.23 |
| 2026-04-11 00:00 |
16:55:38.56 |
-17:16:55.7 |
HIP 82861 |
29.08 |
| 2026-04-11 12:00 |
16:55:32.14 |
-17:16:31.5 |
HIP 82861 |
29.02 |
| 2026-04-12 00:00 |
16:55:25.52 |
-17:16:07.2 |
HIP 82861 |
29.06 |
| 2026-04-12 12:00 |
16:55:18.70 |
-17:15:42.6 |
HIP 82861 |
29.21 |
| 2026-04-13 00:00 |
16:55:11.68 |
-17:15:17.9 |
HIP 82861 |
29.46 |
| 2026-04-13 12:00 |
16:55:04.46 |
-17:14:52.9 |
HIP 82861 |
29.84 |
| 2026-04-14 00:00 |
16:54:57.05 |
-17:14:27.8 |
HIP 82861 |
30.33 |
| 2026-04-14 12:00 |
16:54:49.43 |
-17:14:02.5 |
HIP 82861 |
30.95 |
| 2026-04-15 00:00 |
16:54:41.61 |
-17:13:37.1 |
HIP 82861 |
31.69 |
| 2026-04-15 12:00 |
16:54:33.60 |
-17:13:11.4 |
HIP 82861 |
32.56 |
| 2026-04-16 00:00 |
16:54:25.39 |
-17:12:45.6 |
HIP 82861 |
33.55 |