メタデータ
| 項目 |
値 |
| Designation |
390P/Gibbs |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-03-23T23:00:23.420160Z |
| Orbit solution date (soln_date, UTC) |
2024-03-04T23:13:05Z |
| Obs used |
339 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
10.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-10-21T05:56:28.665600Z |
| Discovery magnitude (MPC) |
18.45 c |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-03-25.0000000 |
| e |
0.70581897 |
| q (au) |
1.709156 |
| a (au) |
5.809877 |
| i (deg) |
18.522010 |
| Ω (om, deg) |
152.717702 |
| ω (w, deg) |
231.735413 |
| M (ma, deg) |
257.247066 |
等級
散乱 + 全体線形
$$
M_a = (12.035 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.035 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.694 |
| k |
0.800 |
| 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 |
| 2019-08-08 |
2020-01-21 |
+11.1256 |
-3.908 |
| 2020-09-01 |
2021-03-06 |
+1.2842 |
-0.774 |
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 |
13:14:35.73 |
+07:58:07.5 |
HIP 64650 |
16.12 |
| 2026-05-12 12:00 |
13:14:27.54 |
+07:58:36.0 |
HIP 64650 |
16.88 |
| 2026-05-13 00:00 |
13:14:19.40 |
+07:59:03.7 |
HIP 64650 |
17.84 |
| 2026-05-13 12:00 |
13:14:11.33 |
+07:59:30.7 |
HIP 64650 |
18.99 |
| 2026-05-14 00:00 |
13:14:03.32 |
+07:59:56.9 |
HIP 64650 |
20.26 |
| 2026-05-14 12:00 |
13:13:55.38 |
+08:00:22.4 |
HIP 64650 |
21.65 |
| 2026-05-15 00:00 |
13:13:47.50 |
+08:00:47.2 |
HIP 64650 |
23.12 |
| 2026-05-15 12:00 |
13:13:39.69 |
+08:01:11.2 |
HIP 64650 |
24.65 |
| 2026-05-16 00:00 |
13:13:31.95 |
+08:01:34.4 |
HIP 64473 |
23.98 |
| 2026-05-16 12:00 |
13:13:24.27 |
+08:01:56.9 |
HIP 64473 |
22.94 |
| 2026-05-17 00:00 |
13:13:16.67 |
+08:02:18.6 |
HIP 64473 |
22.04 |
| 2026-05-17 12:00 |
13:13:09.13 |
+08:02:39.6 |
HIP 64473 |
21.29 |
| 2026-05-18 00:00 |
13:13:01.66 |
+08:02:59.8 |
HIP 64473 |
20.69 |
| 2026-05-18 12:00 |
13:12:54.27 |
+08:03:19.3 |
HIP 64473 |
20.27 |
| 2026-05-19 00:00 |
13:12:46.95 |
+08:03:38.0 |
HIP 64473 |
20.03 |
| 2026-05-19 12:00 |
13:12:39.70 |
+08:03:56.0 |
HIP 64473 |
19.96 |
| 2026-05-20 00:00 |
13:12:32.52 |
+08:04:13.2 |
HIP 64473 |
20.06 |
| 2026-05-20 12:00 |
13:12:25.42 |
+08:04:29.7 |
HIP 64473 |
20.33 |
| 2026-05-21 00:00 |
13:12:18.39 |
+08:04:45.4 |
HIP 64473 |
20.75 |
| 2026-05-21 12:00 |
13:12:11.44 |
+08:05:00.3 |
HIP 64473 |
21.31 |
| 2026-05-22 00:00 |
13:12:04.56 |
+08:05:14.5 |
HIP 64473 |
22.00 |
| 2026-05-22 12:00 |
13:11:57.76 |
+08:05:28.0 |
HIP 64473 |
22.79 |
| 2026-05-23 00:00 |
13:11:51.04 |
+08:05:40.7 |
HIP 64473 |
23.67 |
| 2026-05-23 12:00 |
13:11:44.39 |
+08:05:52.6 |
HIP 64473 |
24.63 |
| 2026-05-24 00:00 |
13:11:37.83 |
+08:06:03.8 |
HIP 64473 |
25.66 |
| 2026-05-24 12:00 |
13:11:31.34 |
+08:06:14.3 |
HIP 64473 |
26.74 |
| 2026-05-25 00:00 |
13:11:24.93 |
+08:06:24.0 |
HIP 64473 |
27.87 |
| 2026-05-25 12:00 |
13:11:18.60 |
+08:06:33.0 |
HIP 64473 |
29.03 |
| 2026-05-26 00:00 |
13:11:12.34 |
+08:06:41.2 |
HIP 64473 |
30.22 |
| 2026-05-26 12:00 |
13:11:06.17 |
+08:06:48.7 |
HIP 64473 |
31.43 |
| 2026-05-27 00:00 |
13:11:00.09 |
+08:06:55.4 |
HIP 64473 |
32.65 |
| 2026-05-27 12:00 |
13:10:54.08 |
+08:07:01.4 |
HIP 64473 |
33.89 |
| 2026-05-28 00:00 |
13:10:48.15 |
+08:07:06.7 |
HIP 64473 |
35.14 |
| 2026-05-28 12:00 |
13:10:42.31 |
+08:07:11.2 |
HIP 64473 |
36.39 |
| 2026-05-29 00:00 |
13:10:36.55 |
+08:07:15.0 |
HIP 64473 |
37.64 |
| 2026-05-29 12:00 |
13:10:30.87 |
+08:07:18.1 |
HIP 64473 |
38.88 |
| 2026-05-30 00:00 |
13:10:25.27 |
+08:07:20.4 |
HIP 64473 |
40.13 |
| 2026-05-30 12:00 |
13:10:19.76 |
+08:07:22.0 |
HIP 64473 |
41.37 |
| 2026-05-31 00:00 |
13:10:14.33 |
+08:07:22.9 |
HIP 64240 |
41.40 |
| 2026-05-31 12:00 |
13:10:08.99 |
+08:07:23.0 |
HIP 64240 |
41.29 |
| 2026-06-01 00:00 |
13:10:03.73 |
+08:07:22.5 |
HIP 64240 |
41.21 |
| 2026-06-01 12:00 |
13:09:58.56 |
+08:07:21.2 |
HIP 64240 |
41.15 |
| 2026-06-02 00:00 |
13:09:53.47 |
+08:07:19.1 |
HIP 64240 |
41.13 |