メタデータ
| 項目 |
値 |
| Designation |
C/2019 N1 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-01T19:23:18.896640Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:02Z |
| Obs used |
1995 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-07-05T12:59:27.196800Z |
| Discovery magnitude (MPC) |
18.68 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-04-21.0000000 |
| e |
0.99987028 |
| q (au) |
1.704628 |
| a (au) |
13141.158862 |
| i (deg) |
82.424795 |
| Ω (om, deg) |
13.576714 |
| ω (w, deg) |
193.445399 |
| M (ma, deg) |
359.999853 |
等級
散乱 + 全体線形
$$
M_a = (11.769 + 2.574\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.769 |
| n |
2.574 |
| gf |
1.000 |
| gb |
-0.684 |
| k |
0.800 |
| δ90 |
9.991 |
| 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 |
| 2019-06-10 |
2020-03-24 |
+2.0406 |
-1.471 |
| 2020-03-24 |
2020-11-29 |
-0.0339 |
-0.168 |
| 2020-12-03 |
2022-09-01 |
+3.3483 |
-1.177 |
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 |
01:13:24.81 |
-17:41:20.1 |
HIP 5612 |
21.80 |
| 2026-03-26 12:00 |
01:13:31.34 |
-17:40:20.7 |
HIP 5612 |
23.61 |
| 2026-03-27 00:00 |
01:13:37.88 |
-17:39:21.6 |
HIP 5612 |
25.42 |
| 2026-03-27 12:00 |
01:13:44.43 |
-17:38:22.9 |
HIP 5612 |
27.23 |
| 2026-03-28 00:00 |
01:13:50.99 |
-17:37:24.5 |
HIP 5830 |
26.56 |
| 2026-03-28 12:00 |
01:13:57.56 |
-17:36:26.4 |
HIP 5830 |
24.95 |
| 2026-03-29 00:00 |
01:14:04.14 |
-17:35:28.6 |
HIP 5830 |
23.39 |
| 2026-03-29 12:00 |
01:14:10.73 |
-17:34:31.2 |
HIP 5830 |
21.87 |
| 2026-03-30 00:00 |
01:14:17.32 |
-17:33:34.1 |
HIP 5830 |
20.41 |
| 2026-03-30 12:00 |
01:14:23.92 |
-17:32:37.4 |
HIP 5830 |
19.02 |
| 2026-03-31 00:00 |
01:14:30.53 |
-17:31:41.0 |
HIP 5830 |
17.71 |
| 2026-03-31 12:00 |
01:14:37.15 |
-17:30:44.9 |
HIP 5830 |
16.51 |
| 2026-04-01 00:00 |
01:14:43.77 |
-17:29:49.2 |
HIP 5830 |
15.45 |
| 2026-04-01 12:00 |
01:14:50.40 |
-17:28:53.8 |
HIP 5830 |
14.54 |
| 2026-04-02 00:00 |
01:14:57.04 |
-17:27:58.7 |
HIP 5900 |
13.01 |
| 2026-04-02 12:00 |
01:15:03.68 |
-17:27:04.1 |
HIP 5900 |
11.20 |
| 2026-04-03 00:00 |
01:15:10.32 |
-17:26:09.7 |
HIP 5900 |
9.40 |
| 2026-04-03 12:00 |
01:15:16.97 |
-17:25:15.7 |
HIP 5900 |
7.62 |
| 2026-04-04 00:00 |
01:15:23.63 |
-17:24:22.1 |
HIP 5900 |
5.85 |
| 2026-04-04 12:00 |
01:15:30.28 |
-17:23:28.8 |
HIP 5900 |
4.14 |
| 2026-04-05 00:00 |
01:15:36.94 |
-17:22:35.9 |
HIP 5900 |
2.57 |
| 2026-04-05 12:00 |
01:15:43.61 |
-17:21:43.4 |
HIP 5900 |
1.65 |
| 2026-04-06 00:00 |
01:15:50.27 |
-17:20:51.2 |
HIP 5900 |
2.31 |
| 2026-04-06 12:00 |
01:15:56.94 |
-17:19:59.4 |
HIP 5900 |
3.81 |
| 2026-04-07 00:00 |
01:16:03.61 |
-17:19:07.9 |
HIP 5900 |
5.50 |
| 2026-04-07 12:00 |
01:16:10.28 |
-17:18:16.9 |
HIP 5900 |
7.24 |
| 2026-04-08 00:00 |
01:16:16.96 |
-17:17:26.1 |
HIP 5900 |
9.00 |
| 2026-04-08 12:00 |
01:16:23.63 |
-17:16:35.8 |
HIP 5900 |
10.78 |
| 2026-04-09 00:00 |
01:16:30.30 |
-17:15:45.9 |
HIP 5900 |
12.55 |
| 2026-04-09 12:00 |
01:16:36.98 |
-17:14:56.3 |
HIP 5987 |
11.16 |
| 2026-04-10 00:00 |
01:16:43.65 |
-17:14:07.1 |
HIP 5987 |
9.72 |
| 2026-04-10 12:00 |
01:16:50.32 |
-17:13:18.3 |
HIP 5987 |
8.41 |
| 2026-04-11 00:00 |
01:16:56.99 |
-17:12:29.8 |
HIP 5987 |
7.32 |
| 2026-04-11 12:00 |
01:17:03.66 |
-17:11:41.8 |
HIP 5987 |
6.56 |
| 2026-04-12 00:00 |
01:17:10.32 |
-17:10:54.1 |
HIP 5987 |
6.23 |
| 2026-04-12 12:00 |
01:17:16.98 |
-17:10:06.9 |
HIP 5987 |
6.40 |
| 2026-04-13 00:00 |
01:17:23.64 |
-17:09:20.0 |
HIP 5987 |
7.03 |
| 2026-04-13 12:00 |
01:17:30.30 |
-17:08:33.5 |
HIP 5987 |
8.02 |
| 2026-04-14 00:00 |
01:17:36.95 |
-17:07:47.4 |
HIP 5987 |
9.24 |
| 2026-04-14 12:00 |
01:17:43.60 |
-17:07:01.7 |
HIP 5987 |
10.62 |
| 2026-04-15 00:00 |
01:17:50.24 |
-17:06:16.5 |
HIP 5987 |
12.09 |
| 2026-04-15 12:00 |
01:17:56.87 |
-17:05:31.6 |
HIP 5987 |
13.64 |
| 2026-04-16 00:00 |
01:18:03.51 |
-17:04:47.1 |
HIP 5987 |
15.22 |