メタデータ
| 項目 |
値 |
| Designation |
C/2015 R1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-06-25T18:24:22.605120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:14Z |
| Obs used |
257 |
| NEO |
- |
| M1 |
13.500 |
| K1 |
10.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-10-18.0000000 |
| e |
0.63286160 |
| q (au) |
2.165459 |
| a (au) |
5.898208 |
| i (deg) |
22.668327 |
| Ω (om, deg) |
48.514080 |
| ω (w, deg) |
300.537706 |
| M (ma, deg) |
7.859878 |
等級
散乱 + 全体線形
$$
M_a = (13.789 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.789 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.680 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
13:19:13.09 |
+03:32:20.8 |
HIP 64954 |
10.46 |
| 2026-06-01 12:00 |
13:19:05.59 |
+03:32:03.6 |
HIP 64954 |
9.88 |
| 2026-06-02 00:00 |
13:18:58.20 |
+03:31:45.6 |
HIP 64954 |
9.66 |
| 2026-06-02 12:00 |
13:18:50.93 |
+03:31:26.8 |
HIP 64954 |
9.81 |
| 2026-06-03 00:00 |
13:18:43.76 |
+03:31:07.0 |
HIP 64954 |
10.31 |
| 2026-06-03 12:00 |
13:18:36.70 |
+03:30:46.5 |
HIP 64954 |
11.09 |
| 2026-06-04 00:00 |
13:18:29.76 |
+03:30:25.0 |
HIP 64954 |
12.09 |
| 2026-06-04 12:00 |
13:18:22.93 |
+03:30:02.8 |
HIP 64954 |
13.24 |
| 2026-06-05 00:00 |
13:18:16.22 |
+03:29:39.7 |
HIP 64954 |
14.51 |
| 2026-06-05 12:00 |
13:18:09.62 |
+03:29:15.7 |
HIP 64954 |
15.86 |
| 2026-06-06 00:00 |
13:18:03.13 |
+03:28:50.9 |
HIP 64917 |
16.99 |
| 2026-06-06 12:00 |
13:17:56.76 |
+03:28:25.3 |
HIP 64917 |
17.90 |
| 2026-06-07 00:00 |
13:17:50.50 |
+03:27:58.8 |
HIP 64917 |
18.92 |
| 2026-06-07 12:00 |
13:17:44.36 |
+03:27:31.4 |
HIP 64917 |
20.01 |
| 2026-06-08 00:00 |
13:17:38.33 |
+03:27:03.3 |
HIP 64917 |
21.16 |
| 2026-06-08 12:00 |
13:17:32.43 |
+03:26:34.3 |
HIP 64917 |
22.36 |
| 2026-06-09 00:00 |
13:17:26.64 |
+03:26:04.4 |
HIP 64917 |
23.60 |
| 2026-06-09 12:00 |
13:17:20.96 |
+03:25:33.7 |
HIP 64917 |
24.86 |
| 2026-06-10 00:00 |
13:17:15.41 |
+03:25:02.2 |
HIP 64697 |
25.84 |
| 2026-06-10 12:00 |
13:17:09.97 |
+03:24:29.9 |
HIP 64697 |
24.72 |
| 2026-06-11 00:00 |
13:17:04.66 |
+03:23:56.7 |
HIP 64697 |
23.68 |
| 2026-06-11 12:00 |
13:16:59.46 |
+03:23:22.7 |
HIP 64697 |
22.71 |
| 2026-06-12 00:00 |
13:16:54.39 |
+03:22:47.9 |
HIP 64697 |
21.83 |
| 2026-06-12 12:00 |
13:16:49.43 |
+03:22:12.2 |
HIP 64697 |
21.03 |
| 2026-06-13 00:00 |
13:16:44.60 |
+03:21:35.7 |
HIP 64697 |
20.33 |
| 2026-06-13 12:00 |
13:16:39.88 |
+03:20:58.4 |
HIP 64697 |
19.73 |
| 2026-06-14 00:00 |
13:16:35.29 |
+03:20:20.3 |
HIP 64680 |
19.02 |
| 2026-06-14 12:00 |
13:16:30.82 |
+03:19:41.3 |
HIP 64680 |
17.74 |
| 2026-06-15 00:00 |
13:16:26.48 |
+03:19:01.6 |
HIP 64680 |
16.49 |
| 2026-06-15 12:00 |
13:16:22.25 |
+03:18:21.0 |
HIP 64680 |
15.27 |
| 2026-06-16 00:00 |
13:16:18.15 |
+03:17:39.6 |
HIP 64680 |
14.07 |
| 2026-06-16 12:00 |
13:16:14.17 |
+03:16:57.4 |
HIP 64680 |
12.91 |
| 2026-06-17 00:00 |
13:16:10.32 |
+03:16:14.4 |
HIP 64680 |
11.79 |
| 2026-06-17 12:00 |
13:16:06.58 |
+03:15:30.6 |
HIP 64680 |
10.71 |
| 2026-06-18 00:00 |
13:16:02.98 |
+03:14:46.1 |
HIP 64680 |
9.68 |
| 2026-06-18 12:00 |
13:15:59.49 |
+03:14:00.7 |
HIP 64680 |
8.72 |
| 2026-06-19 00:00 |
13:15:56.13 |
+03:13:14.5 |
HIP 64680 |
7.84 |
| 2026-06-19 12:00 |
13:15:52.89 |
+03:12:27.6 |
HIP 64680 |
7.07 |
| 2026-06-20 00:00 |
13:15:49.78 |
+03:11:39.8 |
HIP 64680 |
6.44 |
| 2026-06-20 12:00 |
13:15:46.79 |
+03:10:51.3 |
HIP 64680 |
5.98 |
| 2026-06-21 00:00 |
13:15:43.93 |
+03:10:02.0 |
HIP 64680 |
5.74 |
| 2026-06-21 12:00 |
13:15:41.19 |
+03:09:12.0 |
HIP 64680 |
5.72 |
| 2026-06-22 00:00 |
13:15:38.57 |
+03:08:21.2 |
HIP 64693 |
5.64 |