C/2019 J2 (Palomar)
メタデータ
| 項目 |
値 |
| Designation |
C/2019 J2 (Palomar) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-07-19T17:09:39.836160Z |
| Orbit solution date (soln_date, UTC) |
2021-09-04T23:42:59Z |
| Obs used |
312 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
22.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-05-09T11:22:13.987200Z |
| Discovery magnitude (MPC) |
16.86 r |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-06-10.0000000 |
| e |
0.99767395 |
| q (au) |
1.727002 |
| a (au) |
742.459732 |
| i (deg) |
105.135744 |
| Ω (om, deg) |
25.468130 |
| ω (w, deg) |
98.695628 |
| M (ma, deg) |
359.998065 |
等級
散乱 + 全体線形
$$
M_a = (10.283 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.283 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
| 2019-04-27 |
2019-07-19 |
-32.7489 |
+9.328 |
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) |
| 2026-02-03 00:00 |
09:44:36.12 |
-54:24:24.4 |
HIP 47875 |
9.73 |
| 2026-02-03 12:00 |
09:44:24.18 |
-54:24:30.8 |
HIP 47875 |
11.16 |
| 2026-02-04 00:00 |
09:44:12.22 |
-54:24:36.2 |
HIP 47875 |
12.66 |
| 2026-02-04 12:00 |
09:44:00.25 |
-54:24:40.8 |
HIP 47875 |
14.21 |
| 2026-02-05 00:00 |
09:43:48.26 |
-54:24:44.4 |
HIP 47875 |
15.79 |
| 2026-02-05 12:00 |
09:43:36.26 |
-54:24:47.2 |
HIP 47875 |
17.41 |
| 2026-02-06 00:00 |
09:43:24.24 |
-54:24:49.0 |
HIP 47563 |
17.94 |
| 2026-02-06 12:00 |
09:43:12.21 |
-54:24:50.0 |
HIP 47563 |
16.67 |
| 2026-02-07 00:00 |
09:43:00.17 |
-54:24:50.0 |
HIP 47563 |
15.48 |
| 2026-02-07 12:00 |
09:42:48.13 |
-54:24:49.2 |
HIP 47563 |
14.40 |
| 2026-02-08 00:00 |
09:42:36.07 |
-54:24:47.4 |
HIP 47563 |
13.44 |
| 2026-02-08 12:00 |
09:42:24.00 |
-54:24:44.8 |
HIP 47563 |
12.65 |
| 2026-02-09 00:00 |
09:42:11.93 |
-54:24:41.2 |
HIP 47563 |
12.04 |
| 2026-02-09 12:00 |
09:41:59.85 |
-54:24:36.8 |
HIP 47563 |
11.66 |
| 2026-02-10 00:00 |
09:41:47.77 |
-54:24:31.4 |
HIP 47563 |
11.52 |
| 2026-02-10 12:00 |
09:41:35.68 |
-54:24:25.1 |
HIP 47457 |
10.06 |
| 2026-02-11 00:00 |
09:41:23.60 |
-54:24:18.0 |
HIP 47457 |
8.30 |
| 2026-02-11 12:00 |
09:41:11.51 |
-54:24:09.9 |
HIP 47457 |
6.54 |
| 2026-02-12 00:00 |
09:40:59.42 |
-54:24:00.9 |
HIP 47457 |
4.78 |
| 2026-02-12 12:00 |
09:40:47.33 |
-54:23:51.1 |
HIP 47457 |
3.03 |
| 2026-02-13 00:00 |
09:40:35.24 |
-54:23:40.3 |
HIP 47457 |
1.31 |
| 2026-02-13 12:00 |
09:40:23.16 |
-54:23:28.7 |
HIP 47457 |
0.70 |
| 2026-02-14 00:00 |
09:40:11.08 |
-54:23:16.1 |
HIP 47457 |
2.35 |
| 2026-02-14 12:00 |
09:39:59.01 |
-54:23:02.7 |
HIP 47457 |
4.10 |
| 2026-02-15 00:00 |
09:39:46.95 |
-54:22:48.3 |
HIP 47457 |
5.87 |
| 2026-02-15 12:00 |
09:39:34.89 |
-54:22:33.1 |
HIP 47398 |
6.74 |
| 2026-02-16 00:00 |
09:39:22.84 |
-54:22:17.0 |
HIP 47344 |
5.54 |
| 2026-02-16 12:00 |
09:39:10.81 |
-54:22:00.0 |
HIP 47344 |
3.93 |
| 2026-02-17 00:00 |
09:38:58.78 |
-54:21:42.0 |
HIP 47344 |
2.54 |
| 2026-02-17 12:00 |
09:38:46.77 |
-54:21:23.3 |
HIP 47344 |
1.93 |
| 2026-02-18 00:00 |
09:38:34.77 |
-54:21:03.6 |
HIP 47344 |
2.69 |
| 2026-02-18 12:00 |
09:38:22.79 |
-54:20:43.0 |
HIP 47344 |
4.13 |
| 2026-02-19 00:00 |
09:38:10.82 |
-54:20:21.6 |
HIP 47344 |
5.76 |
| 2026-02-19 12:00 |
09:37:58.87 |
-54:19:59.3 |
HIP 47272 |
6.87 |
| 2026-02-20 00:00 |
09:37:46.94 |
-54:19:36.2 |
HIP 47272 |
6.88 |
| 2026-02-20 12:00 |
09:37:35.03 |
-54:19:12.1 |
HIP 47272 |
7.32 |
| 2026-02-21 00:00 |
09:37:23.14 |
-54:18:47.2 |
HIP 47272 |
8.13 |
| 2026-02-21 12:00 |
09:37:11.27 |
-54:18:21.4 |
HIP 47272 |
9.20 |
| 2026-02-22 00:00 |
09:36:59.42 |
-54:17:54.8 |
HIP 47272 |
10.47 |
| 2026-02-22 12:00 |
09:36:47.60 |
-54:17:27.3 |
HIP 47088 |
11.46 |
| 2026-02-23 00:00 |
09:36:35.80 |
-54:16:59.0 |
HIP 47088 |
9.86 |
| 2026-02-23 12:00 |
09:36:24.03 |
-54:16:29.8 |
HIP 47088 |
8.33 |
| 2026-02-24 00:00 |
09:36:12.29 |
-54:15:59.8 |
HIP 47088 |
6.91 |