메타데이터
| 항목 |
값 |
| Designation |
P/2021 R1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-12-17T19:36:46.062720Z |
| Orbit solution date (soln_date, UTC) |
2022-12-08T23:43:17Z |
| Obs used |
127 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
15.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-09-04T08:31:35.241600Z |
| Discovery magnitude (MPC) |
20.60 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2022-02-25.0000000 |
| e |
0.41886575 |
| q (au) |
4.885582 |
| a (au) |
8.406977 |
| i (deg) |
5.521079 |
| Ω (om, deg) |
143.406228 |
| ω (w, deg) |
220.343748 |
| M (ma, deg) |
2.797322 |
밝기
산란 + 전체 선형
$$
M_a = (7.514 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.514 |
| n |
6.000 |
| gf |
0.924 |
| gb |
-0.916 |
| k |
1.000 |
| δ90 |
1.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
08:38:14.40 |
+16:36:30.8 |
HIP 42382 |
27.31 |
| 2026-09-20 12:00 |
08:38:26.43 |
+16:35:46.2 |
HIP 42382 |
27.83 |
| 2026-09-21 00:00 |
08:38:38.39 |
+16:35:01.9 |
HIP 42382 |
28.66 |
| 2026-09-21 12:00 |
08:38:50.28 |
+16:34:17.7 |
HIP 42480 |
28.38 |
| 2026-09-22 00:00 |
08:39:02.10 |
+16:33:33.7 |
HIP 42480 |
26.63 |
| 2026-09-22 12:00 |
08:39:13.84 |
+16:32:50.0 |
HIP 42598 |
24.31 |
| 2026-09-23 00:00 |
08:39:25.51 |
+16:32:06.4 |
HIP 42598 |
21.45 |
| 2026-09-23 12:00 |
08:39:37.10 |
+16:31:23.1 |
HIP 42598 |
18.62 |
| 2026-09-24 00:00 |
08:39:48.61 |
+16:30:39.9 |
HIP 42598 |
15.82 |
| 2026-09-24 12:00 |
08:40:00.05 |
+16:29:57.0 |
HIP 42598 |
13.07 |
| 2026-09-25 00:00 |
08:40:11.42 |
+16:29:14.3 |
HIP 42598 |
10.37 |
| 2026-09-25 12:00 |
08:40:22.70 |
+16:28:31.8 |
HIP 42598 |
7.77 |
| 2026-09-26 00:00 |
08:40:33.91 |
+16:27:49.5 |
HIP 42598 |
5.40 |
| 2026-09-26 12:00 |
08:40:45.04 |
+16:27:07.5 |
HIP 42598 |
3.66 |
| 2026-09-27 00:00 |
08:40:56.09 |
+16:26:25.6 |
HIP 42598 |
3.58 |
| 2026-09-27 12:00 |
08:41:07.07 |
+16:25:44.0 |
HIP 42598 |
5.20 |
| 2026-09-28 00:00 |
08:41:17.96 |
+16:25:02.7 |
HIP 42598 |
7.47 |
| 2026-09-28 12:00 |
08:41:28.77 |
+16:24:21.6 |
HIP 42598 |
9.95 |
| 2026-09-29 00:00 |
08:41:39.50 |
+16:23:40.7 |
HIP 42598 |
12.49 |
| 2026-09-29 12:00 |
08:41:50.16 |
+16:23:00.1 |
HIP 42598 |
15.05 |
| 2026-09-30 00:00 |
08:42:00.73 |
+16:22:19.7 |
HIP 42770 |
13.64 |
| 2026-09-30 12:00 |
08:42:11.21 |
+16:21:39.5 |
HIP 42770 |
11.60 |
| 2026-10-01 00:00 |
08:42:21.62 |
+16:20:59.6 |
HIP 42770 |
9.85 |
| 2026-10-01 12:00 |
08:42:31.94 |
+16:20:20.0 |
HIP 42770 |
8.53 |
| 2026-10-02 00:00 |
08:42:42.18 |
+16:19:40.6 |
HIP 42770 |
7.86 |
| 2026-10-02 12:00 |
08:42:52.33 |
+16:19:01.5 |
HIP 42770 |
7.98 |
| 2026-10-03 00:00 |
08:43:02.40 |
+16:18:22.7 |
HIP 42770 |
8.84 |
| 2026-10-03 12:00 |
08:43:12.38 |
+16:17:44.1 |
HIP 42770 |
10.23 |
| 2026-10-04 00:00 |
08:43:22.28 |
+16:17:05.8 |
HIP 42770 |
11.97 |
| 2026-10-04 12:00 |
08:43:32.09 |
+16:16:27.8 |
HIP 42770 |
13.91 |
| 2026-10-05 00:00 |
08:43:41.81 |
+16:15:50.1 |
HIP 42770 |
15.97 |
| 2026-10-05 12:00 |
08:43:51.45 |
+16:15:12.6 |
HIP 42770 |
18.10 |
| 2026-10-06 00:00 |
08:44:00.99 |
+16:14:35.4 |
HIP 42770 |
20.26 |
| 2026-10-06 12:00 |
08:44:10.45 |
+16:13:58.6 |
HIP 42888 |
19.39 |
| 2026-10-07 00:00 |
08:44:19.81 |
+16:13:22.0 |
HIP 42888 |
18.50 |
| 2026-10-07 12:00 |
08:44:29.09 |
+16:12:45.7 |
HIP 42888 |
17.89 |
| 2026-10-08 00:00 |
08:44:38.27 |
+16:12:09.7 |
HIP 42888 |
17.56 |
| 2026-10-08 12:00 |
08:44:47.37 |
+16:11:34.1 |
HIP 42888 |
17.52 |
| 2026-10-09 00:00 |
08:44:56.37 |
+16:10:58.7 |
HIP 42888 |
17.77 |
| 2026-10-09 12:00 |
08:45:05.28 |
+16:10:23.6 |
HIP 42888 |
18.28 |
| 2026-10-10 00:00 |
08:45:14.09 |
+16:09:48.9 |
HIP 43058 |
17.49 |
| 2026-10-10 12:00 |
08:45:22.82 |
+16:09:14.5 |
HIP 43058 |
15.36 |
| 2026-10-11 00:00 |
08:45:31.44 |
+16:08:40.4 |
HIP 43058 |
13.27 |