메타데이터
| 항목 |
값 |
| Designation |
C/2016 R2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-05-09T13:59:38.526720Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:12:39Z |
| Obs used |
4319 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
9.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-05-29.0000000 |
| e |
0.99630739 |
| q (au) |
2.602364 |
| a (au) |
704.748706 |
| i (deg) |
58.224063 |
| Ω (om, deg) |
80.569029 |
| ω (w, deg) |
33.191899 |
| M (ma, deg) |
0.001023 |
밝기
산란 + 전체 선형
$$
M_a = (11.078 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.078 |
| n |
2.000 |
| gf |
0.961 |
| gb |
-0.500 |
| k |
0.801 |
| δ90 |
1.413 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2016-08-30 |
2017-12-27 |
-1.8441 |
+0.387 |
| 2017-12-27 |
2018-05-08 |
+20.4769 |
-9.982 |
| 2018-05-09 |
2021-06-27 |
+6.0712 |
-4.191 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
17:13:07.44 |
-15:19:08.2 |
HIP 84190 |
12.17 |
| 2026-03-26 12:00 |
17:13:06.05 |
-15:19:03.8 |
HIP 84190 |
11.90 |
| 2026-03-27 00:00 |
17:13:04.60 |
-15:18:59.4 |
HIP 84190 |
11.62 |
| 2026-03-27 12:00 |
17:13:03.10 |
-15:18:54.9 |
HIP 84190 |
11.34 |
| 2026-03-28 00:00 |
17:13:01.55 |
-15:18:50.4 |
HIP 84190 |
11.06 |
| 2026-03-28 12:00 |
17:12:59.95 |
-15:18:45.8 |
HIP 84190 |
10.78 |
| 2026-03-29 00:00 |
17:12:58.29 |
-15:18:41.3 |
HIP 84190 |
10.50 |
| 2026-03-29 12:00 |
17:12:56.59 |
-15:18:36.7 |
HIP 84190 |
10.22 |
| 2026-03-30 00:00 |
17:12:54.83 |
-15:18:32.1 |
HIP 84190 |
9.94 |
| 2026-03-30 12:00 |
17:12:53.02 |
-15:18:27.4 |
HIP 84190 |
9.67 |
| 2026-03-31 00:00 |
17:12:51.16 |
-15:18:22.7 |
HIP 84190 |
9.41 |
| 2026-03-31 12:00 |
17:12:49.25 |
-15:18:18.0 |
HIP 84190 |
9.15 |
| 2026-04-01 00:00 |
17:12:47.29 |
-15:18:13.3 |
HIP 84190 |
8.91 |
| 2026-04-01 12:00 |
17:12:45.27 |
-15:18:08.5 |
HIP 84190 |
8.69 |
| 2026-04-02 00:00 |
17:12:43.21 |
-15:18:03.8 |
HIP 84190 |
8.48 |
| 2026-04-02 12:00 |
17:12:41.09 |
-15:17:59.0 |
HIP 84190 |
8.30 |
| 2026-04-03 00:00 |
17:12:38.93 |
-15:17:54.2 |
HIP 84190 |
8.14 |
| 2026-04-03 12:00 |
17:12:36.71 |
-15:17:49.3 |
HIP 84190 |
8.02 |
| 2026-04-04 00:00 |
17:12:34.45 |
-15:17:44.5 |
HIP 84190 |
7.93 |
| 2026-04-04 12:00 |
17:12:32.13 |
-15:17:39.6 |
HIP 84190 |
7.88 |
| 2026-04-05 00:00 |
17:12:29.77 |
-15:17:34.7 |
HIP 84190 |
7.87 |
| 2026-04-05 12:00 |
17:12:27.35 |
-15:17:29.8 |
HIP 84190 |
7.91 |
| 2026-04-06 00:00 |
17:12:24.89 |
-15:17:24.9 |
HIP 84190 |
7.99 |
| 2026-04-06 12:00 |
17:12:22.37 |
-15:17:19.9 |
HIP 84190 |
8.12 |
| 2026-04-07 00:00 |
17:12:19.81 |
-15:17:15.0 |
HIP 84190 |
8.30 |
| 2026-04-07 12:00 |
17:12:17.20 |
-15:17:10.0 |
HIP 84190 |
8.52 |
| 2026-04-08 00:00 |
17:12:14.53 |
-15:17:05.0 |
HIP 84190 |
8.79 |
| 2026-04-08 12:00 |
17:12:11.82 |
-15:17:00.1 |
HIP 84190 |
9.11 |
| 2026-04-09 00:00 |
17:12:09.07 |
-15:16:55.1 |
HIP 84190 |
9.47 |
| 2026-04-09 12:00 |
17:12:06.26 |
-15:16:50.1 |
HIP 84190 |
9.87 |
| 2026-04-10 00:00 |
17:12:03.41 |
-15:16:45.0 |
HIP 84190 |
10.31 |
| 2026-04-10 12:00 |
17:12:00.50 |
-15:16:40.0 |
HIP 84190 |
10.79 |
| 2026-04-11 00:00 |
17:11:57.55 |
-15:16:35.0 |
HIP 84190 |
11.30 |
| 2026-04-11 12:00 |
17:11:54.56 |
-15:16:30.0 |
HIP 84190 |
11.84 |
| 2026-04-12 00:00 |
17:11:51.51 |
-15:16:24.9 |
HIP 84058 |
11.43 |
| 2026-04-12 12:00 |
17:11:48.42 |
-15:16:19.9 |
HIP 84058 |
10.70 |
| 2026-04-13 00:00 |
17:11:45.28 |
-15:16:14.9 |
HIP 84058 |
9.95 |
| 2026-04-13 12:00 |
17:11:42.10 |
-15:16:09.8 |
HIP 84058 |
9.20 |
| 2026-04-14 00:00 |
17:11:38.87 |
-15:16:04.8 |
HIP 84058 |
8.44 |
| 2026-04-14 12:00 |
17:11:35.59 |
-15:15:59.7 |
HIP 84058 |
7.67 |
| 2026-04-15 00:00 |
17:11:32.27 |
-15:15:54.7 |
HIP 84058 |
6.90 |
| 2026-04-15 12:00 |
17:11:28.90 |
-15:15:49.7 |
HIP 84058 |
6.13 |
| 2026-04-16 00:00 |
17:11:25.49 |
-15:15:44.6 |
HIP 84058 |
5.37 |