メタデータ
| 項目 |
値 |
| Designation |
C/2018 X3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-12-30T19:11:56.958720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:48Z |
| Obs used |
50 |
| NEO |
- |
| M1 |
16.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-12-12T11:04:53.472000Z |
| Discovery magnitude (MPC) |
20.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-12-10.0000000 |
| e |
0.78271953 |
| q (au) |
2.698917 |
| a (au) |
12.421353 |
| i (deg) |
43.369641 |
| Ω (om, deg) |
78.924758 |
| ω (w, deg) |
359.834482 |
| M (ma, deg) |
359.531712 |
等級
散乱 + 全体線形
$$
M_a = (16.711 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.711 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.943 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
15:39:51.30 |
+01:27:53.4 |
HIP 76751 |
7.54 |
| 2026-07-29 12:00 |
15:39:49.34 |
+01:27:08.5 |
HIP 76751 |
8.09 |
| 2026-07-30 00:00 |
15:39:47.44 |
+01:26:23.2 |
HIP 76751 |
8.68 |
| 2026-07-30 12:00 |
15:39:45.60 |
+01:25:37.7 |
HIP 76751 |
9.30 |
| 2026-07-31 00:00 |
15:39:43.82 |
+01:24:52.0 |
HIP 76751 |
9.96 |
| 2026-07-31 12:00 |
15:39:42.11 |
+01:24:06.0 |
HIP 76751 |
10.63 |
| 2026-08-01 00:00 |
15:39:40.46 |
+01:23:19.7 |
HIP 76751 |
11.32 |
| 2026-08-01 12:00 |
15:39:38.88 |
+01:22:33.1 |
HIP 76751 |
12.02 |
| 2026-08-02 00:00 |
15:39:37.36 |
+01:21:46.3 |
HIP 76751 |
12.73 |
| 2026-08-02 12:00 |
15:39:35.90 |
+01:20:59.3 |
HIP 76751 |
13.45 |
| 2026-08-03 00:00 |
15:39:34.50 |
+01:20:12.0 |
HIP 76751 |
14.17 |
| 2026-08-03 12:00 |
15:39:33.17 |
+01:19:24.4 |
HIP 76751 |
14.90 |
| 2026-08-04 00:00 |
15:39:31.90 |
+01:18:36.6 |
HIP 76751 |
15.63 |
| 2026-08-04 12:00 |
15:39:30.70 |
+01:17:48.6 |
HIP 76751 |
16.36 |
| 2026-08-05 00:00 |
15:39:29.56 |
+01:17:00.3 |
HIP 76751 |
17.09 |
| 2026-08-05 12:00 |
15:39:28.48 |
+01:16:11.7 |
HIP 76751 |
17.83 |
| 2026-08-06 00:00 |
15:39:27.47 |
+01:15:23.0 |
HIP 76751 |
18.57 |
| 2026-08-06 12:00 |
15:39:26.52 |
+01:14:34.0 |
HIP 76751 |
19.31 |
| 2026-08-07 00:00 |
15:39:25.64 |
+01:13:44.7 |
HIP 76751 |
20.05 |
| 2026-08-07 12:00 |
15:39:24.82 |
+01:12:55.3 |
HIP 76751 |
20.78 |
| 2026-08-08 00:00 |
15:39:24.06 |
+01:12:05.6 |
HIP 76751 |
21.52 |
| 2026-08-08 12:00 |
15:39:23.37 |
+01:11:15.7 |
HIP 76577 |
21.86 |
| 2026-08-09 00:00 |
15:39:22.74 |
+01:10:25.6 |
HIP 76577 |
21.19 |
| 2026-08-09 12:00 |
15:39:22.18 |
+01:09:35.2 |
HIP 76577 |
20.53 |
| 2026-08-10 00:00 |
15:39:21.68 |
+01:08:44.7 |
HIP 76577 |
19.91 |
| 2026-08-10 12:00 |
15:39:21.25 |
+01:07:53.9 |
HIP 76577 |
19.31 |
| 2026-08-11 00:00 |
15:39:20.88 |
+01:07:02.9 |
HIP 76577 |
18.74 |
| 2026-08-11 12:00 |
15:39:20.57 |
+01:06:11.8 |
HIP 76577 |
18.20 |
| 2026-08-12 00:00 |
15:39:20.33 |
+01:05:20.4 |
HIP 76577 |
17.70 |
| 2026-08-12 12:00 |
15:39:20.15 |
+01:04:28.8 |
HIP 76577 |
17.25 |
| 2026-08-13 00:00 |
15:39:20.04 |
+01:03:37.0 |
HIP 76577 |
16.84 |
| 2026-08-13 12:00 |
15:39:19.99 |
+01:02:45.1 |
HIP 76577 |
16.47 |
| 2026-08-14 00:00 |
15:39:20.01 |
+01:01:52.9 |
HIP 76577 |
16.16 |
| 2026-08-14 12:00 |
15:39:20.09 |
+01:01:00.6 |
HIP 76577 |
15.91 |
| 2026-08-15 00:00 |
15:39:20.23 |
+01:00:08.1 |
HIP 76577 |
15.71 |
| 2026-08-15 12:00 |
15:39:20.44 |
+00:59:15.4 |
HIP 76577 |
15.58 |
| 2026-08-16 00:00 |
15:39:20.71 |
+00:58:22.5 |
HIP 76577 |
15.51 |
| 2026-08-16 12:00 |
15:39:21.05 |
+00:57:29.5 |
HIP 76577 |
15.51 |
| 2026-08-17 00:00 |
15:39:21.45 |
+00:56:36.3 |
HIP 76577 |
15.57 |
| 2026-08-17 12:00 |
15:39:21.91 |
+00:55:42.9 |
HIP 76577 |
15.70 |
| 2026-08-18 00:00 |
15:39:22.44 |
+00:54:49.4 |
HIP 76577 |
15.90 |
| 2026-08-18 12:00 |
15:39:23.03 |
+00:53:55.7 |
HIP 76577 |
16.16 |
| 2026-08-19 00:00 |
15:39:23.69 |
+00:53:01.9 |
HIP 76577 |
16.48 |