Optics and Precision Engineering, Volume. 31, Issue 6, 793(2023)

Simultaneous three-channel photometric system of 1.2 m photoelectric telescope

Bingli NIU1,2, Zhe KANG1,2、*, Zhenwei LI1,2, You LÜ1, and Chengzhi LIU1,2、*
Author Affiliations
  • 1Changchun Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Changchun307, China
  • 2University of Chinese Academy of Sciences, Beijing100049, China
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    Figures & Tables(12)
    Simultaneous three-channel photometric system of the 1.2 m photoelectric telescope
    Optical path of the whole and each channel of the simultaneous three-channel photometric system
    Spot diagram of three channels
    Modulation transfer function of three channels
    Fraction of enclosed energy curves of three channels
    Original images of BD+174708 left panel: the original image of the g' channel, with an FOV of 21.5′×21.5′; middle panel: the original image of the r' channel, with an FOV of 21.5′×21.5′; right panel: the original image of the i' channel, with an FOV of 21.3′×21.3′
    Degradations in optical quality along the off angle direction in the three channels
    • Table 1. Optical transmittance of optical components in each channel of the photometer

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      Table 1. Optical transmittance of optical components in each channel of the photometer

      Optical elementChannel
      g′r′i′
      Reflector M3Reflectance0.8910.940.92
      Transmittance------
      Transmittance due to material absorption loss------
      Reflector M4Reflectance0.8910.940.92
      Transmittance------
      Transmittance due to material absorption loss------
      Reflector M5Reflectance0.8910.940.92
      Transmittance------
      Transmittance due to material absorption loss------
      Field lensReflectance------
      Transmittance0.940.950.93
      Transmittance due to material absorption loss0.020.020.02
      First beam-splitting lensReflectance0.98----
      Transmittance--0.910.95
      Transmittance due to material absorption loss--0.020.02
      Second beam-splitting lensReflectance--0.90--
      Transmittance----0.95
      Transmittance due to material absorption loss----0.02
      Imaging lens groupReflectance------
      Transmittance0.9270.910.93
      Transmittance due to material absorption loss0.040.040.04
      FiltersReflectance------
      Transmittance0.950.970.95
      Transmittance due to material absorption loss0.020.020.02
      Total optical transmittance0.5290.5150.511
    • Table 2. Landolt standard stars used in the research

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      Table 2. Landolt standard stars used in the research

      Star nameR.A.(J2000)Dec.(J2000)V magColor index
      B-VU-BV-RR-I
      SA92-34200:55:10+00:43:1411.6130.436-0.0420.2660.270
      SA92-26300:55:40+00:36:1811.7821.0480.8430.5630.522
      SA93-31701:54:38+00:43:0011.5460.488-0.0550.2930.298
      SA93-33301:55:05+00:45:4412.0110.8320.4360.4690.422
      GCRV 575708:44:05+36:14:4310.8330.739-0.1000.3850.362
      SA100-24108:52:35-00:39:4810.1390.1570.1010.0780.085
      SA101-31509:54:51-00:27:2811.2491.1531.0560.6120.559
      SA101-31609:54:52-00:18:3211.5520.4930.0320.2930.291
      Feige 3410:39:36+43:06:0911.362-0.435-1.277-0.158-0.137
      Ross 10610:50:28+56:26:3112.4460.779-0.0780.4110.386
      SA102-62010:55:06-00:48:1910.0691.0831.0200.6420.524
      Wolf 36511:11:00+06:25:1111.1810.9420.0410.4780.447
      SA113-26021:41:48+00:23:5212.4060.5140.0690.3080.298
      SA113-47521:41:51+00:39:1910.3061.0580.8440.5700.527
      SA115-55423:41:31+01:26:2611.8121.0050.5480.5860.538
      SA115-48623:41:33+01:16:4512.4820.493-0.0490.2980.308
    • Table 3. SDSS standard stars used in the research

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      Table 3. SDSS standard stars used in the research

      Star nameR.A.(J2000)Dec.(J2000)r′magColor index
      u′-g′g′-r′r′-i′i′-z′
      Hilt 3100:28:11.15+64:07:51.810.9960.9990.5870.2940.147
      BD+71003100:43:44.34+72:10:43.110.0910.8960.2600.0790.007
      SA95-19003:53:13.24+00:16:22.812.5931.3000.1260.0020.043
      SA95-19303:53:20.59+00:16:34.713.8442.4891.0970.4070.214
      SA97-28405:58:25.02+00:05:13.510.2992.6411.1550.5210.320
      SA97-28805:58:30.09+00:06:40.710.7181.3310.4010.1060.013
      BD+75032508:10:49.50+74:57:57.89.786-0.508-0.514-0.382-0.323
      BD+54121608:19:22.56+54:05:09.79.5860.8900.3000.1070.010
      BD+9219009:29:15.55+08:38:00.611.0490.9020.2380.0760.009
      Ross88909:40:43.19+01:00:29.510.3800.8750.2200.0680.006
      BD+29209110:47:23.16+28:23:56.010.1230.8640.3660.1320.040
      Feige6612:37:23.52+25:03:59.910.747-0.345-0.476-0.367-0.316
      BD+17470822:11:31.37+18:05:34.19.3500.9200.2900.1000.020
      SA114-53122:40:36.78+00:51:55.611.8801.4190.5400.1870.080
      SA114-65422:41:26.14+01:10:10.711.6721.3980.4490.1370.040
      SA115-42023:42:36.48+01:05:58.811.0631.0910.2900.0800.007
      SA115-51623:44:15.38+01:14:12.510.1072.1670.8070.3170.172
    • Table 4. Efficiency of three-channel photometric system

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      Table 4. Efficiency of three-channel photometric system

      EtotalE1.2mEphotometer
      g′30.346.265.6
      r′28.541.768.3
      i′31.950.163.7
    • Table 5. Limiting magnitude of three-channel photometric system

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      Table 5. Limiting magnitude of three-channel photometric system

      Channelg′r′i′
      2020.1215.4616.8915.93
      2021.0315.3316.5615.71
      2021.0415.0515.8815.36
      2021.1115.1916.2215.51
      Mean value15.2616.3915.63
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    Bingli NIU, Zhe KANG, Zhenwei LI, You LÜ, Chengzhi LIU. Simultaneous three-channel photometric system of 1.2 m photoelectric telescope[J]. Optics and Precision Engineering, 2023, 31(6): 793

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    Paper Information

    Category: Modern Applied Optics

    Received: Aug. 31, 2022

    Accepted: --

    Published Online: Apr. 4, 2023

    The Author Email: KANG Zhe (kangz@cho.ac.cn), LIU Chengzhi (lcz@cho.ac.cn)

    DOI:10.37188/OPE.20233106.0793

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