メタデータ
| 項目 |
値 |
| Designation |
P/2021 N1 (ZTF) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-06-06T13:17:58.335360Z |
| Orbit solution date (soln_date, UTC) |
2022-10-07T00:43:31Z |
| Obs used |
96 |
| NEO |
Yes |
| M1 |
17.800 |
| K1 |
21.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-07-02T11:08:00.096000Z |
| Discovery magnitude (MPC) |
18.94 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) |
2021-07-07.0000000 |
| e |
0.67679260 |
| q (au) |
0.962147 |
| a (au) |
2.976871 |
| i (deg) |
11.505610 |
| Ω (om, deg) |
301.158449 |
| ω (w, deg) |
21.189770 |
| M (ma, deg) |
5.842413 |
等級
散乱 + 全体線形
$$
M_a = (17.269 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.269 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
18:28:53.53 |
-49:15:25.7 |
HIP 90568 |
11.24 |
| 2026-05-12 12:00 |
18:30:44.20 |
-49:21:37.0 |
HIP 90691 |
9.13 |
| 2026-05-13 00:00 |
18:32:36.49 |
-49:27:45.0 |
HIP 90731 |
21.85 |
| 2026-05-13 12:00 |
18:34:30.44 |
-49:33:49.4 |
HIP 91091 |
13.13 |
| 2026-05-14 00:00 |
18:36:26.10 |
-49:39:50.0 |
HIP 91091 |
24.25 |
| 2026-05-14 12:00 |
18:38:23.52 |
-49:45:46.3 |
HIP 91449 |
18.68 |
| 2026-05-15 00:00 |
18:40:22.75 |
-49:51:38.3 |
HIP 91449 |
17.13 |
| 2026-05-15 12:00 |
18:42:23.85 |
-49:57:25.5 |
HIP 91757 |
2.62 |
| 2026-05-16 00:00 |
18:44:26.86 |
-50:03:07.6 |
HIP 91860 |
10.03 |
| 2026-05-16 12:00 |
18:46:31.84 |
-50:08:44.3 |
HIP 92157 |
5.34 |
| 2026-05-17 00:00 |
18:48:38.85 |
-50:14:15.2 |
HIP 92157 |
18.13 |
| 2026-05-17 12:00 |
18:50:47.94 |
-50:19:39.9 |
HIP 92531 |
8.01 |
| 2026-05-18 00:00 |
18:52:59.17 |
-50:24:58.0 |
HIP 92680 |
14.19 |
| 2026-05-18 12:00 |
18:55:12.60 |
-50:30:09.1 |
HIP 92815 |
20.55 |
| 2026-05-19 00:00 |
18:57:28.31 |
-50:35:12.6 |
HIP 93182 |
20.69 |
| 2026-05-19 12:00 |
18:59:46.34 |
-50:40:08.2 |
HIP 93182 |
14.67 |
| 2026-05-20 00:00 |
19:02:06.77 |
-50:44:55.4 |
HIP 93624 |
23.80 |
| 2026-05-20 12:00 |
19:04:29.65 |
-50:49:33.5 |
HIP 93624 |
12.60 |
| 2026-05-21 00:00 |
19:06:55.07 |
-50:54:02.1 |
HIP 94069 |
19.95 |
| 2026-05-21 12:00 |
19:09:23.08 |
-50:58:20.5 |
HIP 94069 |
6.04 |
| 2026-05-22 00:00 |
19:11:53.75 |
-51:02:28.2 |
HIP 94458 |
21.04 |
| 2026-05-22 12:00 |
19:14:27.16 |
-51:06:24.4 |
HIP 94458 |
19.92 |
| 2026-05-23 00:00 |
19:17:03.36 |
-51:10:08.5 |
HIP 94804 |
19.98 |
| 2026-05-23 12:00 |
19:19:42.44 |
-51:13:39.8 |
HIP 94975 |
20.70 |
| 2026-05-24 00:00 |
19:22:24.46 |
-51:16:57.5 |
HIP 95239 |
3.71 |
| 2026-05-24 12:00 |
19:25:09.50 |
-51:20:00.8 |
HIP 95468 |
13.98 |
| 2026-05-25 00:00 |
19:27:57.62 |
-51:22:48.8 |
HIP 95642 |
8.09 |
| 2026-05-25 12:00 |
19:30:48.88 |
-51:25:20.8 |
HIP 95642 |
33.21 |
| 2026-05-26 00:00 |
19:33:43.37 |
-51:27:35.6 |
HIP 96515 |
32.58 |
| 2026-05-26 12:00 |
19:36:41.15 |
-51:29:32.4 |
HIP 96515 |
6.19 |
| 2026-05-27 00:00 |
19:39:42.29 |
-51:31:10.1 |
HIP 96803 |
9.27 |
| 2026-05-27 12:00 |
19:42:46.84 |
-51:32:27.6 |
HIP 96849 |
15.01 |
| 2026-05-28 00:00 |
19:45:54.89 |
-51:33:23.8 |
HIP 97583 |
40.80 |
| 2026-05-28 12:00 |
19:49:06.48 |
-51:33:57.5 |
HIP 97583 |
15.56 |
| 2026-05-29 00:00 |
19:52:21.68 |
-51:34:07.4 |
HIP 97786 |
19.48 |
| 2026-05-29 12:00 |
19:55:40.54 |
-51:33:52.2 |
HIP 98278 |
30.61 |
| 2026-05-30 00:00 |
19:59:03.12 |
-51:33:10.4 |
HIP 98294 |
21.84 |
| 2026-05-30 12:00 |
20:02:29.47 |
-51:32:00.7 |
HIP 98622 |
6.18 |
| 2026-05-31 00:00 |
20:05:59.64 |
-51:30:21.5 |
HIP 99114 |
12.83 |
| 2026-05-31 12:00 |
20:09:33.66 |
-51:28:11.3 |
HIP 99222 |
11.16 |
| 2026-06-01 00:00 |
20:13:11.57 |
-51:25:28.3 |
HIP 99344 |
36.17 |
| 2026-06-01 12:00 |
20:16:53.40 |
-51:22:10.7 |
HIP 100126 |
18.87 |
| 2026-06-02 00:00 |
20:20:39.18 |
-51:18:16.9 |
HIP 100126 |
21.84 |