메타데이터
| 항목 |
값 |
| Designation |
C/2021 R7 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-04-14T11:28:22.085760Z |
| Orbit solution date (soln_date, UTC) |
2022-12-08T23:43:02Z |
| Obs used |
63 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
14.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-09-05T10:13:05.577600Z |
| Discovery magnitude (MPC) |
22.01 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-11-23.0000000 |
| e |
0.99519043 |
| q (au) |
5.640615 |
| a (au) |
1172.790949 |
| i (deg) |
158.854146 |
| Ω (om, deg) |
170.145186 |
| ω (w, deg) |
139.994299 |
| M (ma, deg) |
0.005461 |
밝기
산란 + 전체 선형
$$
M_a = (7.384 + 5.410\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.384 |
| n |
5.410 |
| gf |
0.999 |
| gb |
-0.856 |
| k |
1.000 |
| δ90 |
10.000 |
| 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) |
| 2026-07-29 00:00 |
19:44:14.97 |
-41:13:24.2 |
HIP 97137 |
7.26 |
| 2026-07-29 12:00 |
19:44:00.38 |
-41:13:47.9 |
HIP 97137 |
9.13 |
| 2026-07-30 00:00 |
19:43:45.83 |
-41:14:11.0 |
HIP 97062 |
8.58 |
| 2026-07-30 12:00 |
19:43:31.30 |
-41:14:33.6 |
HIP 97062 |
8.54 |
| 2026-07-31 00:00 |
19:43:16.81 |
-41:14:55.6 |
HIP 97062 |
9.34 |
| 2026-07-31 12:00 |
19:43:02.34 |
-41:15:17.0 |
HIP 97062 |
10.79 |
| 2026-08-01 00:00 |
19:42:47.91 |
-41:15:37.9 |
HIP 97062 |
12.67 |
| 2026-08-01 12:00 |
19:42:33.52 |
-41:15:58.2 |
HIP 97062 |
14.80 |
| 2026-08-02 00:00 |
19:42:19.16 |
-41:16:18.0 |
HIP 96910 |
14.81 |
| 2026-08-02 12:00 |
19:42:04.84 |
-41:16:37.2 |
HIP 96910 |
14.09 |
| 2026-08-03 00:00 |
19:41:50.55 |
-41:16:55.8 |
HIP 96910 |
13.86 |
| 2026-08-03 12:00 |
19:41:36.31 |
-41:17:13.9 |
HIP 96910 |
14.17 |
| 2026-08-04 00:00 |
19:41:22.10 |
-41:17:31.5 |
HIP 96910 |
14.96 |
| 2026-08-04 12:00 |
19:41:07.94 |
-41:17:48.4 |
HIP 96910 |
16.17 |
| 2026-08-05 00:00 |
19:40:53.81 |
-41:18:04.9 |
HIP 96694 |
17.42 |
| 2026-08-05 12:00 |
19:40:39.73 |
-41:18:20.7 |
HIP 96694 |
15.15 |
| 2026-08-06 00:00 |
19:40:25.69 |
-41:18:36.0 |
HIP 96694 |
13.03 |
| 2026-08-06 12:00 |
19:40:11.70 |
-41:18:50.8 |
HIP 96694 |
11.15 |
| 2026-08-07 00:00 |
19:39:57.76 |
-41:19:05.0 |
HIP 96694 |
9.62 |
| 2026-08-07 12:00 |
19:39:43.86 |
-41:19:18.6 |
HIP 96694 |
8.64 |
| 2026-08-08 00:00 |
19:39:30.01 |
-41:19:31.7 |
HIP 96694 |
8.39 |
| 2026-08-08 12:00 |
19:39:16.21 |
-41:19:44.3 |
HIP 96694 |
8.91 |
| 2026-08-09 00:00 |
19:39:02.46 |
-41:19:56.3 |
HIP 96694 |
10.09 |
| 2026-08-09 12:00 |
19:38:48.76 |
-41:20:07.7 |
HIP 96694 |
11.72 |
| 2026-08-10 00:00 |
19:38:35.12 |
-41:20:18.6 |
HIP 96545 |
12.68 |
| 2026-08-10 12:00 |
19:38:21.53 |
-41:20:29.0 |
HIP 96545 |
10.56 |
| 2026-08-11 00:00 |
19:38:07.99 |
-41:20:38.8 |
HIP 96545 |
8.70 |
| 2026-08-11 12:00 |
19:37:54.51 |
-41:20:48.1 |
HIP 96545 |
7.27 |
| 2026-08-12 00:00 |
19:37:41.09 |
-41:20:56.8 |
HIP 96545 |
6.55 |
| 2026-08-12 12:00 |
19:37:27.72 |
-41:21:05.0 |
HIP 96545 |
6.77 |
| 2026-08-13 00:00 |
19:37:14.41 |
-41:21:12.6 |
HIP 96545 |
7.83 |
| 2026-08-13 12:00 |
19:37:01.17 |
-41:21:19.7 |
HIP 96545 |
9.45 |
| 2026-08-14 00:00 |
19:36:47.98 |
-41:21:26.3 |
HIP 96545 |
11.38 |
| 2026-08-14 12:00 |
19:36:34.86 |
-41:21:32.4 |
HIP 96545 |
13.48 |
| 2026-08-15 00:00 |
19:36:21.80 |
-41:21:37.9 |
HIP 96336 |
13.93 |
| 2026-08-15 12:00 |
19:36:08.81 |
-41:21:42.9 |
HIP 96336 |
11.58 |
| 2026-08-16 00:00 |
19:35:55.88 |
-41:21:47.3 |
HIP 96336 |
9.28 |
| 2026-08-16 12:00 |
19:35:43.01 |
-41:21:51.3 |
HIP 96336 |
7.09 |
| 2026-08-17 00:00 |
19:35:30.21 |
-41:21:54.7 |
HIP 96336 |
5.11 |
| 2026-08-17 12:00 |
19:35:17.49 |
-41:21:57.6 |
HIP 96336 |
3.69 |
| 2026-08-18 00:00 |
19:35:04.82 |
-41:22:00.0 |
HIP 96336 |
3.55 |
| 2026-08-18 12:00 |
19:34:52.23 |
-41:22:01.9 |
HIP 96336 |
4.77 |
| 2026-08-19 00:00 |
19:34:39.71 |
-41:22:03.2 |
HIP 96336 |
6.64 |