메타데이터
| 항목 |
값 |
| Designation |
P/2021 R5 (Rankin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-01-11T23:34:59.966400Z |
| Orbit solution date (soln_date, UTC) |
2024-04-29T13:12:24Z |
| Obs used |
251 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
18.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2021-09-09T06:52:28.416000Z |
| Discovery magnitude (MPC) |
19.34 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-10-17.0000000 |
| e |
0.30753521 |
| q (au) |
3.322719 |
| a (au) |
4.798394 |
| i (deg) |
7.852203 |
| Ω (om, deg) |
219.963779 |
| ω (w, deg) |
167.335702 |
| M (ma, deg) |
351.843709 |
밝기
산란 + 전체 선형
$$
M_a = (8.398 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.398 |
| n |
6.000 |
| gf |
0.972 |
| gb |
-0.934 |
| k |
1.000 |
| δ90 |
9.634 |
| 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) |
| 2026-03-26 00:00 |
12:20:07.32 |
-07:43:46.4 |
HIP 60179 |
8.36 |
| 2026-03-26 12:00 |
12:19:53.45 |
-07:42:03.7 |
HIP 60179 |
9.63 |
| 2026-03-27 00:00 |
12:19:39.59 |
-07:40:20.8 |
HIP 60179 |
12.04 |
| 2026-03-27 12:00 |
12:19:25.73 |
-07:38:37.5 |
HIP 60179 |
15.06 |
| 2026-03-28 00:00 |
12:19:11.88 |
-07:36:54.0 |
HIP 60179 |
18.38 |
| 2026-03-28 12:00 |
12:18:58.04 |
-07:35:10.2 |
HIP 60179 |
21.88 |
| 2026-03-29 00:00 |
12:18:44.21 |
-07:33:26.1 |
HIP 60179 |
25.47 |
| 2026-03-29 12:00 |
12:18:30.39 |
-07:31:41.9 |
HIP 59905 |
25.23 |
| 2026-03-30 00:00 |
12:18:16.59 |
-07:29:57.4 |
HIP 59905 |
24.15 |
| 2026-03-30 12:00 |
12:18:02.81 |
-07:28:12.7 |
HIP 59905 |
23.66 |
| 2026-03-31 00:00 |
12:17:49.05 |
-07:26:27.8 |
HIP 59848 |
22.34 |
| 2026-03-31 12:00 |
12:17:35.31 |
-07:24:42.7 |
HIP 59848 |
19.63 |
| 2026-04-01 00:00 |
12:17:21.60 |
-07:22:57.5 |
HIP 59848 |
17.35 |
| 2026-04-01 12:00 |
12:17:07.91 |
-07:21:12.1 |
HIP 59848 |
15.69 |
| 2026-04-02 00:00 |
12:16:54.25 |
-07:19:26.6 |
HIP 59848 |
14.86 |
| 2026-04-02 12:00 |
12:16:40.62 |
-07:17:41.0 |
HIP 59848 |
14.99 |
| 2026-04-03 00:00 |
12:16:27.02 |
-07:15:55.2 |
HIP 59848 |
16.05 |
| 2026-04-03 12:00 |
12:16:13.46 |
-07:14:09.4 |
HIP 59743 |
16.60 |
| 2026-04-04 00:00 |
12:15:59.93 |
-07:12:23.5 |
HIP 59743 |
13.54 |
| 2026-04-04 12:00 |
12:15:46.45 |
-07:10:37.6 |
HIP 59743 |
10.96 |
| 2026-04-05 00:00 |
12:15:33.00 |
-07:08:51.6 |
HIP 59743 |
9.26 |
| 2026-04-05 12:00 |
12:15:19.59 |
-07:07:05.6 |
HIP 59743 |
8.93 |
| 2026-04-06 00:00 |
12:15:06.23 |
-07:05:19.6 |
HIP 59743 |
10.11 |
| 2026-04-06 12:00 |
12:14:52.92 |
-07:03:33.5 |
HIP 59743 |
12.36 |
| 2026-04-07 00:00 |
12:14:39.66 |
-07:01:47.5 |
HIP 59743 |
15.20 |
| 2026-04-07 12:00 |
12:14:26.44 |
-07:00:01.5 |
HIP 59743 |
18.36 |
| 2026-04-08 00:00 |
12:14:13.28 |
-06:58:15.6 |
HIP 59703 |
18.45 |
| 2026-04-08 12:00 |
12:14:00.17 |
-06:56:29.7 |
HIP 59559 |
17.90 |
| 2026-04-09 00:00 |
12:13:47.12 |
-06:54:43.9 |
HIP 59559 |
15.65 |
| 2026-04-09 12:00 |
12:13:34.13 |
-06:52:58.2 |
HIP 59559 |
14.03 |
| 2026-04-10 00:00 |
12:13:21.20 |
-06:51:12.5 |
HIP 59559 |
13.26 |
| 2026-04-10 12:00 |
12:13:08.33 |
-06:49:27.0 |
HIP 59559 |
13.48 |
| 2026-04-11 00:00 |
12:12:55.53 |
-06:47:41.7 |
HIP 59559 |
14.64 |
| 2026-04-11 12:00 |
12:12:42.79 |
-06:45:56.5 |
HIP 59507 |
15.73 |
| 2026-04-12 00:00 |
12:12:30.12 |
-06:44:11.4 |
HIP 59507 |
16.32 |
| 2026-04-12 12:00 |
12:12:17.52 |
-06:42:26.6 |
HIP 59507 |
17.63 |
| 2026-04-13 00:00 |
12:12:04.99 |
-06:40:41.9 |
HIP 59402 |
15.87 |
| 2026-04-13 12:00 |
12:11:52.54 |
-06:38:57.4 |
HIP 59402 |
12.33 |
| 2026-04-14 00:00 |
12:11:40.16 |
-06:37:13.2 |
HIP 59402 |
8.80 |
| 2026-04-14 12:00 |
12:11:27.86 |
-06:35:29.2 |
HIP 59402 |
5.29 |
| 2026-04-15 00:00 |
12:11:15.64 |
-06:33:45.5 |
HIP 59402 |
1.82 |
| 2026-04-15 12:00 |
12:11:03.50 |
-06:32:02.0 |
HIP 59402 |
1.73 |
| 2026-04-16 00:00 |
12:10:51.44 |
-06:30:18.9 |
HIP 59402 |
5.15 |